Effects of process parameters on microstructure and mechanical properties of friction stir lap linear welded 6061 aluminum alloy to NZ30K magnesium alloy
Effects of process parameters on microstructure and mechanical properties of friction stir lap linear welded 6061 aluminum alloy to NZ30K magnesium alloy
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DOI：
10.1016/j.jma.2016.11.005
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发表时间：
2017-03
影响因子：
17.6
通讯作者：
S. Tan;F. Zheng;Juan Chen;Jingyu Han;Yujuan Wu;L. Peng
中科院分区：
文献类型：
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作者：
S. Tan;F. Zheng;Juan Chen;Jingyu Han;Yujuan Wu;L. Peng
研究了6061铝合金与铸态Mg-3.0Nd-0.2Zn-0.7Zr(wt.%)(NZ30K)合金搅拌摩擦焊线焊接头的微观组织和搭接剪切行为。采用不同的刀具旋转和移动速度来准备接头。温度场分析表明，每个样品的峰值温度可达450 °C，超过了根据Al-Mg系二元相图确定的共晶反应温度437 °C和450 °C。在Al和Mg合金的界面处有强烈的混合，形成了Al3Mg2金属间化合物。当旋转速度为900min/ 、移动速度为120min/ 时，焊缝表现出最大的拉伸剪切破坏载荷，约为2.24 kN。在400 °C热处理0.5 h后，该值提高了13%。
The microstructures and lap-shear behaviors of friction stir lap linear welded as-extruded 6061 Al alloy to as-cast Mg–3.0Nd–0.2Zn–0.7Zr (wt.%) (NZ30K) alloy joints were examined. Various tool rotation and travel speeds were adopted to prepare the joints. The analysis of temperature field indicates that the peak temperature for each sample can reach 450 °C, which exceeds the eutectic reaction temperatures of 437 °C and 450 °C according to the binary phase diagram of Al–Mg system. The fierce intermixing can be found at the interface between Al and Mg alloys, forming the intermetallic of Al3Mg2. Welds with the rotation speed of 900 rpm and travel speed of 120 mm/min display the highest tensile shear failure load of about 2.24 kN. The value was increased by 13% after the sample was heat treated at 400 °C for 0.5 h.