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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of Cooling Rate on the Precipitation Characteristics of Cast Al-Si-Cu Alloy
    Autorzy:
    Okayasu, M.
    Sahara, N.
    Touda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079810.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    casting
    solid solution
    aging
    solidification rate
    precipitation
    stop aluminium
    odlew
    szybkość krzepnięcia
    Opis:
    The influence of the cooling rate on the extent of precipitation hardening of cast aluminum alloy (ADC12) was investigated experimentally. This study explored the cooling rate of the solidification of Cu in the α-Al phase to improve the mechanical properties of ADC12 after an aging process (Cu based precipitation hardening). The solid solution of Cu occurred in the α-Al phases during the casting process at cooling rates exceeding 0.03°C/s. This process was replaced with a solid solution process of T6 treatments. The extent of the solid solution varied depending on the cooling rate; with a higher cooling rate, a more extensive solid solution was formed. For the cast ADC12 alloy made at a high cooling rate, high precipitation hardening occurred after low-temperature heating (at 175°C for 20 h), which improved the mechanical properties of the cast Al alloys. However, the low-temperature heating at the higher temperature for a longer time decreased the hardness due to over aging.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 55-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Magnesium Alloys Produced by the Heated Mold Continuous Casting Process
    Autorzy:
    Okayasu, M.
    Wu, S.
    Tanimoto, T.
    Takeuchi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381654.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy
    unidirectional solidification
    continuous casting
    mechanical properties
    microstructural characteristic
    stop magnezu
    krystalizacja kierunkowa
    odlewanie ciągłe
    właściwości mechaniczne
    charakterystyka mikrostrukturalna
    Opis:
    Investigation of the tensile and fatigue properties of cast magnesium alloys, created by the heated mold continuous casting process (HMC), was conducted. The mechanical properties of the Mg-HMC alloys were overall higher than those for the Mg alloys, made by the conventional gravity casting process (GC), and especially excellent mechanical properties were obtained for the Mg97Y2Zn1-HMC alloy. This was because of the fine-grained structure composed of the α-Mg phases with the interdendritic LPSO phase. Such mechanical properties were similar levels to those for conventional cast aluminum alloy (Al84.7Si10.5Cu2.5Fe1.3Zn1 alloys: ADC12), made by the GC process. Moreover, the tensile properties (σ and εf) and fatigue properties of the Mg97Y2Zn1-HMC alloy were about 1.5 times higher than that for the commercial Mg90Al9Zn1-GC alloy (AZ91). The high correlation rate between tensile properties and fatigue strength (endurance limit: σl) was obtained. With newly proposed etching technique, the residual stress in the Mg97Y2Zn1 alloy could be revealed, and it appeared that the high internal stress was severely accumulated in and around the long-period stacking-order phases (LPSO). This was made during the solidification process due to the different shrinkage rate between α-Mg and LPSO. In this etching technique, micro-cracks were observed on the sample surface, and amount of micro-cracks (density) could be a parameter to determine the severity of the internal stress, i.e., a large amount to micro-cracks is caused by the high internal stress.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 208-216
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of supplemental lighting during the period of rapid fruit development on the growth, yield, and energy use efficiency in strawberry plant production
    Autorzy:
    Yoneda, A.
    Yasutake, D.
    Hidaka, K.
    Muztahidin, N.I.
    Miyoshi, Y.
    Kitano, M.
    Okayasu, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082873.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    energy-saving
    environmental control
    greenhouse
    LED
    translocation
    Opis:
    Supplemental lighting techniques in greenhouses can increase plant growth and yield but require substantial amounts of energy. We proposed the use of energy-saving supplemental lighting, which was applied during rapid fruit development when the transport of photosynthetic products into the fruit was active. We measured the physiological responses (photosynthesis, growth, yield) of the strawberry plants with single fruit truss, wherein the following 3 treatments were made: plants were cultivated with no supplemental lighting (control), supplemental lighting throughout the experimental period (normal-light), and supplemental lighting during rapid fruit development (short-light). The period of rapid fruit development corresponded to 33% of the experimental period, and the cumulative light intensity for the short-light treatment was half of that for the normal-light treatment, and twice that of the control treatment. Consequently, the leaf area and dry weight of the plant body were significantly increased following normal-light and short-light treatments compared with the control treatment. The yield for the short-light treatment was also increased and nearly equal to that of the normal-light treatment but no significance to the control treatment. However, the energy use efficiency of the short-light was improved 1.5-fold compared to the normal-light treatment. Thus, shortening the period of supplemental lighting in accordance with the characteristics of fruit development is potentially effective.
    Źródło:
    International Agrophysics; 2020, 34, 2; 233-239
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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