Autor: Guo, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Pre-formulation Compatibility Studies of 5-Amino-1H-tetrazole Nitrate with Several Typical Materials by Thermal and Non-thermal Techniques
Autorzy:: Guo, W.
Han, Z.
Lin, Q.
Wang, B.
Powiązania:: https://bibliotekanauki.pl/articles/358375.pdf
Data publikacji:: 2018
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: 5-ATN
compatibility
energetic materials
Opis:: The aim of the present study was to assess the physicochemical compatibility of a promising energetic salt, 5-amino-1H-tetrazole nitrate (5-ATN), with some typical materials. Thermal techniques (differential scanning calorimetry (DSC) and vacuum stability test (VST)) and non-thermal techniques (X-ray diffractometry (XRD) and Fourier Transform Infrared Spectroscopy (FTIR)) were applied. Five energetic materials (TNT, RDX, HMX, CL-20 and AP) and three common additives (Al, DOS and F2604-2) were tested to evaluate their compatibility with 5-ATN. Based on the DSC results, except for AP that was only partially compatible with 5-ATN, all of the selected materials exhibited good compatible with 5-ATN. The VST test further confirmed the compatibility of the 5-ATN/AP mixtures. Combined with the thermal methods, the FTIR results agreed with the DSC findings. The XRD results showed some differences.
Źródło:: Central European Journal of Energetic Materials; 2018, 15, 1; 100-114
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Hierarchy of plasticity traits in responses of Quercus aliena to light conditions and water availability
Autorzy:: Xu, N.
Wang, R.
Liu, J.
Lu, P.
Guo, W.
Powiązania:: https://bibliotekanauki.pl/articles/41404.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Opis:: This study aimed to investigate plasticity of different plant traits to varied light and water availability. A greenhouse experiment was conducted with Quercus aliena seedlings with two light and four soil water levels. Plant traits related to leaf physiology, morphology, anatomy, and biomass production were determined. The results showed that plant size had significant effects on leaf area, leaf number, shoot height, basal diameter and crown area. After excluding the influence of plant size, water treatment had stronger effects on plants compared to light levels, and their interaction effect was significant. The limited water supply significantly inhibited leaf photosynthetic rate and the fluorescence efficiency under high light. However, leaves submitted to moderate drought stress showed enhanced fluorescence activity under shade condition. Grand plasticity of leaf physiology and growth was the highest, followed by biomass allocation and leaf morphology, and lastly anatomy, and this ranking did not change as resources considered. Among the variables, leaf petiole length, chlorophyll content and leaf area could be selected as candidates for estimation of species’ plasticity to water, light and their interaction, respectively. Therefore, our results suggested that there was a hierarchy existing among traits plasticity in Q. aliena, and supported the aboveground facilitation hypothesis that shade could alleviate the adverse effect of drought.
Źródło:: Dendrobiology; 2015, 74
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Flotation behavior and separation mechanism of quartz and iron minerals in α-bromolauric acid reverse flotation system
Autorzy:: Han, Y.
Guo, W.
Zhu, Y.
Wei, Y.
Gu, X.
Powiązania:: https://bibliotekanauki.pl/articles/949733.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: quartz
separation
reverse flotation
iron minerals
α-Bromolauric acid
Opis:: A new type collector α-Bromolauric acid (α-BLA) had been proved to be an efficient collector for quartz flotation. However, the effects of α-BLA on the flotation behavior of iron minerals and quartz-iron separation had not been investigated. In this study, collector α-BLA was synthesized in the laboratory. The flotation behavior of quartz, hematite and magnetite under α-BLA reverse flotation system were investigated and the separation mechanism of quartz-irons was studied by contact angle, zeta-potential and infrared spectroscopy. The results showed that the optimum flotation pH was 11.5 for quartz, 6.45 for hematite and 6.97 for magnetite. The best α-BLA concentrations was 75 mg/dm3 for quartz flotation, 125 mg/dm3 for hematite and magnetite flotation. The activator CaCl2 had little effect on the flotation of hematite and magnetite, but the minimum dosage 50 mg/dm3 of activator CaCl2 was necessary for quartz flotation. On the contrary, starch had no effect on the flotation of quartz, while the recoveries of magnetite and hematite tended to be 0% as starch concentration more than 80 mg/dm3. The separation mechanism of quartz from iron minerals under α-BLA reverse flotation system was that the starch could be selectively adsorbed on the surface of hematite and magnetite in the form of strong hydrogen bond adsorption. However, the same adsorption of starch did not occur on the surface of quartz, so the α-BLA can be successfully adsorbed on the surface of activated quartz to make the quartz strongly hydrophobic, and then to be floated out.
Źródło:: Physicochemical Problems of Mineral Processing; 2018, 54, 3; 992-1003
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Acer truncatum seedlings are more plastic than Quercus variabilis seedlings in response to different light regimes
Autorzy:: Guo, X.
Wang, R.-Q.
Wang, C.D.
Xu, F.
Zhao, S.
Guo, W.-H.
Powiązania:: https://bibliotekanauki.pl/articles/41339.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: Acer truncatum
seedling
Quercus variabilis
Chinese cork oak
plant response
light regime
irradiance acclimation
chlorophyll fluorescence
morphology
photoinhibition
Opis:: In this study, we investigated responses of the mid-successional species Acer truncatum Bunge and the late-successional species Quercus variabilis Blume to three solar illumination conditions: (1) constant low light (CL), (2) constant high light (CH) and (3) low light first and high light afterwards (LH). The last treatment was to simulate a canopy opening. Both species exhibited increases in biomass, totally and in part, and decreases in leaf water content, specific leaf area and chlorophyll concentrations in LH treatment compared to CL treatment. For A. truncatum, exposure to high light condition (LH) increased crown area, and decreased root to shoot ratio, stem mass ratio and leaf perimeter. However, for Q. variabilis, LH treatment increased stem diameter at ground height, effective quantum yield, photochemical quenching and decreased maximum photosystem II quantum yield. The biomass allocation pattern did not change in Q. variabilis among three light conditions. With respect to newly developed leaves, no significant differences were found in leaf size of Q. variabilis between LH treatment and CH treatment while that of A. truncatum decreased in LH treatment. All chlorophyll fluorescence parameters in newly developed oak leaves in LH treatment increased compared to those of CH treatment while no difference was found for A. truncatum between LH and CH treatment. A. truncatum displayed a greater overall plasticity than Q. variabilis although the oak seedlings have a greater plasticity with respect to chlorophyll concentration and chlorophyll ﬂuorescence parameters. A. truncatum should be a better candidate for vegetation recovery, especially in places with heterogeneous light conditions.
Źródło:: Dendrobiology; 2016, 76
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Stromuling when stressed!
Autorzy:: Krenz, B.
Guo, T.W.
Kleinow, T.
Powiązania:: https://bibliotekanauki.pl/articles/58707.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: stromule
geminivirus
plant virus
chloroplast
plastid
plant cell
Opis:: Stromules are stroma-filled tubules, extruding from the plastid and surrounded by both envelope membranes, but so far, stromules remain enigmatic structures and their function unknown. Stromules can interconnect plastids and have been found to associate with the nucleus, endoplasmic reticulum, Golgi complex, plasma membrane, mitochondria and peroxisomes. This minireview briefly summarizes markers to visualize stromules, inducers of stromules and provides new data about plant virus induced stromules.
Źródło:: Acta Societatis Botanicorum Poloniae; 2014, 83, 4
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effects of nitrogen addition on growth and photosynthetic characteristics of Acer truncatum seedlings
Autorzy:: Guo, X.
Wang, R.
Chang, R.
Liang, X.
Wang, C.
Luo, Y.
Yuan, Y.
Guo, W.
Powiązania:: https://bibliotekanauki.pl/articles/41162.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: nitrogen addition
plant growth
photosynthesis
Acer truncatum
tree
plant morphology
carbon assimilation
chlorophyll fluorescence
seedling
Opis:: Increasing levels of atmospheric nitrogen deposition have greatly affected forest trees. Acer truncatum Bunge has a large distribution in northern China, Korea and Japan and plays an important ecological role in forest ecosystems. We investigated the responses of A. truncatum to a broad range of nitrogen addition regimes with a focus on seedling growth, biomass partitioning, leaf morphology, gas exchange physiology and chlorophyll fluorescence physiology. Moderate nitrogen addition promoted shoot height, stem diameter at ground height, total biomass, size of leaves and chlorophyll fluorescence and gas exchange performance, whereas extreme level of nitrogen addition did not result in such facilitation. Chlorophyll content, pattern of biomass partitioning, ratio of leaf length to width, leaf water content, and specific leaf area did not change among the addition regimes. The critical amount of nitrogen deposition should be defined in the context of a certain time period in a particular region for a certain species at a special developmental stage. The critical amount of N deposition that weakens total biomass facilitation in A. truncatum planted in mixed soil of yellow cinnamon soil and humic soil is approximately 10 g N m−2 y−1 during the first growing season.
Źródło:: Dendrobiology; 2014, 72
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Combustion Characteristics and Mechanism of Boron-based, Fuel-rich Propellants with Agglomerated Boron Powder
Autorzy:: Xu, H. -X.
Pang, W.-Q.
Guo, H.-W.
Zhao, F.-Q.
Wang, Y.
Sun, Z.-H.
Powiązania:: https://bibliotekanauki.pl/articles/358733.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: analytical chemistry
boron-based fuel-rich solid propellants
agglomerated boron powder
combustion performance
combustion mechanism
Opis:: In order to extend the burning rate of boron-based, fuel-rich solid propellants with agglomerated boron powder, the effects of the boron content, the AP content, and of the magnesium powder content, on the burning rate and pressure exponent have been studied systematically. It has been shown that when the AP content is constant, the burning rate of the propellants increases with an increase in the agglomerated boron content. Furthermore, the burning rate and pressure exponent increase with increasing the contents of AP and magnesium powder. By means of single colour frame amplification photography and combustion wave tests, the combustion mechanism of these propellants has been investigated. It has been shown that the flame of the propellants becomes brighter by increasing the AP content, the dT/dxcp and dT/dxgp of the propellant FR-5 being around 6815 and 5789 °C/mm respectively, higher than those of FR-4, resulting in greater burning rates. The Ts of these propellants is above 683 °C, which is higher than the decomposition peak temperatures of agglomerated boron powder and of propellants (about 649 °C), which indicates that agglomerated boron powder is partially oxidized on the combustion surface, and the heat released from it may be beneficial to the combustion of the propellants.
Źródło:: Central European Journal of Energetic Materials; 2014, 11, 4; 575-587
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Maintenance optimization for systems with dependent competing risks using a copula function
Optymalizacja eksploatacji dla systemów z zależnymi zagrożeniami konkurującymi przy wykorzystaniu funkcji kopuły
Autorzy:: Guo, Ch.
Wang, W.
Guo, B.
Peng, R.
Powiązania:: https://bibliotekanauki.pl/articles/301712.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: zależne ryzyka konkurujące
funkcja kopuły
dane symulowane
degradacja
zaburzenia losowe
optymalizacja eksploatacji
dependent competing risks
copula function
simulated data
degradation
random shocks
maintenance optimization
Opis:: This paper develops a joint copula reliability model for systems subjected to dependent competing risks caused by two degradation processes and random shocks. The two degradation processes follow gamma processes and the random shocks follow a non-homogeneous Poisson process (NHPP). Their interdependence relationship is modeled by a copula function, which is determined by a two-stage method based on simulated data. It is shown that the proposed model can provide more precise results than the model without considering the dependent relationship. Through the proposed reliability model, two maintenance models are studied and compared. It is found that the inspection cost has significant effects on the choosing of maintenance policy.
W niniejszej pracy opracowano wspólny model niezawodności z użyciem kopuły dla systemów poddawanych zależnym zagrożeniom konkurującym powodowanym przez dwa procesy degradacji i zaburzenia losowe. Owe dwa procesy degradacji reprezentują typ procesu gamma, podczas gdy zaburzenia losowe są typem niejednorodnego procesu Poissona (non-homogeneous Poisson process - NHPP). Ich związek wzajemnej zależności modelowany jest przy użyciu funkcji kopuły, która jest wyznaczana na podstawie dwuetapowej metody opartej o dane symulowane. Wykazano, iż proponowany model może zapewnić bardziej precyzyjne wyniki niż model, w którym nie ujęto związku zależności. W oparciu o proponowany model niezawodności, badane i porównywane są dwa modele eksploatacji. Stwierdzono, iż koszt przeglądu ma duży wpływ na wybór polityki eksploatacyjnej.
Źródło:: Eksploatacja i Niezawodność; 2013, 15, 1; 9-17
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Adsorptive performance of MCM-41 towards hg(II) in water. Adsorption and desorption studies
Autorzy:: Zhai, Q. Z.
Hu, W.-H.
Guo, X.-Y.
Powiązania:: https://bibliotekanauki.pl/articles/208154.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: electron microscopy
mesoporous silicates
cetyltrimethylammonium bromide
adsorption conditions
mikroskopia elektronowa
krzemiany mezoporowate
bromek cetyltrimethylammonium
warunki adsorpcyjne
Opis:: MCM-41 mesoporous material was prepared under a standard conditions by using cetyltrime-thylammonium bromide as a structure-directing agent and tetraethyl orthosilicate as silica source from the liquid phase at 80 °C. Powder X-ray diffraction and scanning electron microscopy used to characterize the product, showed that the MCM-41material had an average particle size of 110 nm. The synthesized material was used to investigate the effects of acidity, adsorption time, the concentration of Hg²⁺, adsorbent dosage and temperature on the adsorption of Hg²⁺. The results showed that the optimal adsorptive conditions were: pH 5.0, m(MCM-41):mHg²⁺ 6.67, temperature 20 °C and contact adsorption time 60 min, for the initial Hg²⁺concentration of 1.0 mg/cm³. The maximum adsorptive amount of Hg²⁺ was 56.48 mg Hg²⁺/g MCM-41. The results of the desorptive effect of three desorption agents such as HCl, HNO₃ and HAc showed that the best desorbent was HCl at the concentration of 0.10 mol/dm³. The highest desorption efficiency was 77.21% for the desorption time 2 h.
Źródło:: Environment Protection Engineering; 2016, 42, 1; 5-15
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Nonlinear degradation modeling and maintenance policy for a two-stage degradation system based on cumulative damage model
System charakteryzujący się dwuetapowym procesem degradacji: nieliniowe modelowanie degradacji oraz wyznaczanie strategii eksploatacji systemu na podstawie modelu sumowania uszkodzeń
Autorzy:: Ni, X.
Zhao, J.
Song, W.
Guo, C.
Li, H.
Powiązania:: https://bibliotekanauki.pl/articles/301523.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: two-stage
nonlinear
degradation modeling
cumulative damage model
maintenance policy
dwu-etapowy
nieliniowy
modelowanie degradacji
model sumowania uszkodzeń
strategia eksploatacji
Opis:: This paper attempts to take into account a two-stage degradation system which degradation rate is non-stationary and change over time. The system degradation is thought to be caused by shocks, and system degradation model is established based on cumulative damage model. The nonlinear degradation process is expressed by different shock damage and shock counting. And shock damage and shock counting are assumed to be Gamma distribution and non-homogeneous Poisson process, respectively. On the basis of these, system reliability model and nonlinear degradation model are given. In order to optimal maintenance policy for considered system, adaptive maintenance policy and time-dependent maintenance policy are studied, and mean maintenance cost rate is established to evaluate the maintenance policies. Numerical examples are given to analyze the influences of degradation model parameters and find optimal maintenance policy for considered system.
W przedstawionym artykule badano system, w którym proces degradacji zachodzi dwuetapowo, a szybkość degradacji jest zmienna w czasie. Przyjęto, że do degradacji systemu dochodzi w wyniku wstrząsów. Model degradacji systemu oparto na modelu sumowania uszkodzeń. Nieliniowy proces degradacji określono jako taki, w którym uszkodzenie powodowane wstrząsem oraz częstotliwość wstrząsów są wartościami zmiennymi. Przyjęto, że uszkodzenie powodowane wstrząsem ma rozkład gamma a częstotliwość wstrząsów jest niejednorodnym procesem Poissona. Na tej podstawie utworzono model niezawodności systemu oraz model degradacji nieliniowej. W celu opracowania optymalnej strategii eksploatacji dla rozpatrywanego systemu, rozważono dwa typy strategii utrzymania ruchu: strategię adaptacyjną oraz strategię czasowo-zależną. Strategie te oceniano określając średni poziom kosztów eksploatacji. Przykłady numeryczne posłużyły do analizy wpływu parametrów modelu degradacji oraz pozwoliły określić optymalną strategię utrzymania dla rozpatrywanego systemu.
Źródło:: Eksploatacja i Niezawodność; 2016, 18, 2; 171-180
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The effects of cavity geometry on an aspirated compressor cascade
Autorzy:: Guo, S.
Lu, H.-W.
Liu, J.
Wu, C.-J.
Powiązania:: https://bibliotekanauki.pl/articles/280871.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: highly loaded compressor cascade
boundary layer suction
suction flow distribution
off-take cavity
Opis:: The impact of the bleed off-take cavity within aspirated blades on the aerodynamic perfor- mance of a highly loaded compressor cascade was explored. Three-dimensional Navier-Stokes simulations were conducted in rectangular compressor cascades after validation against expe- rimental results were done. Five different off-take configurations with varying suction loca- tion were numerically evaluated. The results show that the regularities of the suction flow distribution on the suction slot inlet greatly influence the benefits of boundary layer suction. The distribution style greatly depends not only on the flow condition of the blade passage, but also on the realization of the suction process and the geometry of the cavity inside the aspirated blade. The low kinetic fluid in the endwall region compared with that around the midspan is usually prone to be sucked into the suction slot. The distribution of the suc- tion mass flow along the spanwise direction would be symmetrical if the suction position is properly selected and the inside off-take cavity is well designed, even though the bleeding system has been simplified to be asymmetrical as employed in the present document.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 117-128
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Expression and characterisation of cucumber fruit flesh thickness-related gene CSA2M058670.1
Autorzy:: Wang, W.
Wang, S.
Guo, Y.
Li, M.
Hou, L.
Powiązania:: https://bibliotekanauki.pl/articles/12709293.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:: Bulked segregant analysis combined with specific length amplified fragment sequencing techniques have been applied to determine the fine genetic mapping of fruit flesh thickness-related genes in cucumber. Herein, the Csa2M058670.1 gene was subjected to real time fluorescence quantitative PCR (qRT-PCR) and sequence analysis, indicating a strong correlation with cucumber fruit flesh thickness. Expression and characterisation of the Csa2M058670.1 gene were performed based on previous studies. The results of the fluorescence-based quantitative PCR showed that Csa2M058670.1 was expressed in all organs, but levels were highest in fruit peel, fruit flesh, and female flowers. Furthermore, Csa2M058670.1 expression was induced by abiotic stresses including drought, low temperature, and high salt. Domain analysis revealed that the protein encoded by Csa2M058670.1 possesses an SET (Su(var), Enhancern of zeste CE(z), and Trithorax) domain that may control cell division and differentiation. Therefore, we speculated that Csa2M058670.1 might affect fruit flesh thickness in cucumbers by influencing cell division.
Źródło:: Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 2; 25-33
1644-0692
Pojawia się w:: Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Collosion and Absorption Behaviors of Inclusions on Refractory
Autorzy:: Ding-Guo, Z.
Ming, G.
Xin, L.
Shu-Huan, W.
Powiązania:: https://bibliotekanauki.pl/articles/352357.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: inclusion
refractory wall surface
collision and absorption
critical stay speed
Opis:: The paper is dedicated to analysis the inclusion behavior in steel using theoretical calculation and simulation of water. The aim is to establish collision and absorption model of inclusions on refractory. The article discusses the variation of critical stay speed and critical shear with the radius of inclusions in the process of colliding, rebounding and absorbing. The results show the critical stay speed and critical shear of alumina respectively surpasses 1 cm·s^-1 and 1 N·m^-2, while titanium dioxide separately exceeds 4 cm·s^-1 and 10 N·m^-2 for the inclusions that radius is less than 2.5 μm. If the inclusions occur rebound after colliding, the inclusions that radius is less than 7 μm will still be absorbed by the surface, while the inclusions that radius is more than 10 μm can easily reenter the steel. The model coincides with the water simulation results and it is of good adaptability.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2A; 857-863
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Preparation of Twinned Dendrites of Al-Zn Alloy with High Zn Content
Autorzy:: Gao, K.
Song, W.
Fan, L.
Ding, Y.
Guo, X.
Zhang, R.
Powiązania:: https://bibliotekanauki.pl/articles/351396.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: directional solidification
twinned dendrite
microstructure
growth orientation
deviation angle
Opis:: Twinned dendrites in Al-Zn alloy with high Zn content (40% wt.%) were successfully prepared by directional solidification. At different directional solidification rates (1000 and 1500 μm/s), microstructures and growth orientation variations of Al twinned dendrite and non-twinned dendrite were characterized. By using the inverted trapezoidal graphite sleeve at 1000 μm/s, Al twinned dendrite were formed to developed feather crystal structures in longitudinal section. Its primary and secondary twinned dendrite were grew along [110] direction. Moreover the deviation angle between [110] direction of Al twinned dendrite and the heat flow direction was about 27.15°. While not using the inverted trapezoidal graphite sleeve at 1000 and 1500 μm/s, Al dendrite was the non-twinned dendrite and the twinned dendrite was not appeared. The experimental results showed that the higher temperature gradient, a certain pulling rate and convection environment were the formation conditions of twinned dendrites.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 1657-1662
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki