摩擦搅拌焊参数对超细晶Al-0.2 wt%Sc合金薄板微观组织和热力学性能的影响  

Numerical investigation of friction stir welding parameters on microstructure, thermal and mechanical properties of ultrafine-grained Al-0.2 wt% Sc alloy sheet

作　　者：Valeh TALEBSAFA Mohammad YOUSEFIEH Ehsan BORHANI Ehsan GHARIBSHAHIYAN 

机构地区：[1]Faculty of Materials and Metallurgical Engineering,Semnan University,Semnan 35131-19111,Iran [2]Department of Nano Technology,Nano-Materials Science and Engineering Group,Semnan University,Semnan 35196-45399,Iran [3]AFRA Research and Development Company,Semnan 35351-64142,Iran

出　　处：《Journal of Central South University》2023年第1期61-73,共13页中南大学学报（英文版）

摘　　要：为了研究摩擦搅拌焊参数对超细晶粒Al-Sc合金薄板微观组织、热力学性能的影响,采用累积滚焊法(ARB)制备的超细晶粒Al-Sc合金薄板进行了摩擦搅拌焊数值模拟。此外,研究了刀具转速、焊接速度和刀具倾斜角等摩擦搅拌焊参数的最优条件。在SYSWELD和Visual-Environment软件中实现了数值模拟,并通过实验结果进行了验证。结果表明,摩擦搅拌焊是一种有利于保持超细晶(UFG)组织的技术,并在累积滚焊材料中具有较好的力学性能。刀具转速对热性能和力学性能的影响最大。在刀具转速为700 r/min、焊接速度为80 mm/min、刀具倾斜角度为3°时,Al-Sc合金的硬度和抗屈强度均达到最高。In this paper, the friction stir welding(FSW) of ultrafine-grained Al-Sc alloy sheets, obtained by accumulative roll bonding(ARB) method, has been simulated in order to indicate the impact of the FSW on the microstructure,thermal and mechanical properties. In addition, the effectiveness of the FSW parameters, i. e, tool rotational speed,welding speed, and tool tilt angle was investigated to achieve the optimized parameters. The numerical modelling was implemented in SYSWELD and Visual-Environment software and was validated by experimental results. The findings indicated that FSW is a beneficial process to maintain the ultrafine-grained(UFG) microstructure, having high mechanical properties in the accumulative roll bonded material. Tool rotational speed had the highest impact on thermal and mechanical properties. The highest values of the hardness and the yield strength of the Al-Sc sheets were achieved under the optimal parameters of the tool rotational speed, welding speed, and tool tilt angle of 700 r/min, 80 mm/min,and 3°, respectively.

关 键 词：搅拌摩擦焊 超细晶 铝合金 机械性能 有限元建模 

分 类 号：TG146.21[一般工业技术—材料科学与工程]