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    Wyświetlanie 1-4 z 4
    Tytuł:
    Comparative Study of 2060-T8 Al-Li Alloy Friction Stir Welded Joints Between Natural Cooling and Water Cooling
    Autorzy:
    Ma, Lin
    Niu, Shiyu
    Ji, Shude
    Gong, Peng
    Powiązania:
    https://bibliotekanauki.pl/articles/355846.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    2060-T8 Al-Li alloy
    friction stir welding
    water cooling
    microstructure
    mechanical properties
    Opis:
    2060-T8 Al-Li alloy was friction stir butt welded under natural and water cooling conditions. Microstructures and mechanical properties of the welding joints were mainly compared and discussed. By spraying water on the top surface of stir zone, the grain size was reduced, attributing to the improvement of microhardness. The maximum tensile strength under the water cooling reached 461.1 MPa. The joint fractured at the stir zone due to the thickness reduction and the joint softening. The fracture surface consisted of many dimples with various sizes, indicating the typical ductile fracture. The strategy to apply the low heat input at the welding stage and high cooling rate at the cooling stage during FSW is necessary to obtain a high-quality FSW joint.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 305-312
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue Behavior of MIG-Welded 7N01-T4 Aluminum Alloy with Different V-Groove Angles
    Autorzy:
    Ma, Zhongwei
    Li, Qinghua
    Ma, Lin
    He, Zhaokun
    Liang, Zhimin
    Powiązania:
    https://bibliotekanauki.pl/articles/351758.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    7N01-T4 aluminum alloy
    MIG welding
    V-groove angle
    fatigue
    fracture
    Opis:
    7N01-T4 aluminum alloy was welded by metal inert gas welding and the influence of V-groove angle on joint fatigue properties was investigated. The results indicate that the volume of fusion zone (FZ) and the grains in FZ become small when the groove angle decreases to 50° from 70°. Most pores distribute at the FZ edge and fewer pores are formed in the small angle joint. The fatigue crack mainly initiates at the transition region between the weld passes due to the pore concentration. The small angle contributes to increasing joint fatigue properties, especially at the low stress level. The fatigue strength of 50° joint is 103.06 MPa which is 15.3% higher than that of 70° joint.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1577-1584
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Power Ultrasound on Microstructure Evolution During the Transient Liquid Stage of Ultrasonic-Promoted TLP Bonding SiCp/Al MMCs
    Autorzy:
    Zhou, Changzhuang
    Ma, Lin
    Zhu, Chao
    Cui, Qinghe
    Liang, Jindi
    Song, Yujian
    Powiązania:
    https://bibliotekanauki.pl/articles/2174569.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transient liquid phase bonding
    silicon carbide reinforced aluminum matrix composites
    ultrasonics
    zinc interlayer
    Opis:
    Ultrasound-promoted transient liquid phase bonding (U-TLP) is a high quality, high efficiency, and low-cost method for fast bonding of difficult-wetting materials in the atmospheric environment. In this paper, U-TLP was used to bond SiC particles reinforced aluminium-based metal matrix composite which particle volume fraction was 70%. The pure zinc foil was used as the intermediate layer. The effects of ultrasonic on microstructure evolution and mechanical properties of joints during the transient liquefaction stage were investigated. The mechanism of ultrasonic effects in the transient liquefaction stage of U-TLP was also inducted. The results showed that high volume fraction SiCp/Al MMCs were bonded well at low temperature in the air environment. Ultrasonic vibration can remove the oxide film on the surface of aluminum matrix composites, enhance the wettability of SiC particles with weld metal, promote atomic diffusion and homogenization of SiC particles, and improve the welding quality and efficiency. Reasonable increase of ultrasonic vibration time could effectively improve the joint strength.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1283--1291
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Cycle Fatigue Performance of Hollow-Extruded 6005A-T6 Aluminum Alloy Characterized by a Layered Microstructure
    Autorzy:
    Ma, Zhongwei
    Ma, Lin
    Xu, Bo
    Dan, Chuchen
    He, Zhaokun
    Wang, Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/354038.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    hollow-extruded 6005A-T6 aluminum alloy
    fatigue
    fracture
    microstructure
    Opis:
    Sound joint of hollow-extruded 6005A-T6 aluminum alloy was achieved by friction stir welding and its high cycle fatigue performance was mainly investigated. As a result, the joint fatigue limit reaches 128.1 MPa which is 55% of the joint tensile strength. The fatigue fracture mainly occurs at the boundary between the stir zone and thermo-mechanically affected zone due to the large difference in the grain size. This difference is caused by the layered microstructure of the base material. The shell pattern with parallel arcs is the typical morphology in the fracture surface and the distance between arcs is increased with the increase of stress level. The specimen with the fracture located in the stir zone possesses a relatively low fatigue life.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 285-292
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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