Investigation of the welding parameter dependent microstructure and mechanical properties of friction stir welded pure copper
Investigation of the welding parameter dependent microstructure and mechanical properties of friction stir welded pure copper
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DOI：
10.1016/j.msea.2010.07.030
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发表时间：
2010-10
期刊：
影响因子：
6.4
通讯作者：
Yufeng Sun;H. Fujii
中科院分区：
文献类型：
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作者：
Yufeng Sun;H. Fujii
获得了工业纯铜搅拌摩擦焊的工艺窗口，其焊接速度为200~800mm/min，转速为400~1200rpm，施加载荷为1000~1500kg。在搅拌区，通过将施加的载荷增加到1500kg，可以获得平均晶粒尺寸为3.8μm的显着细化的显微组织。此外，较高的施加载荷可以促进位错单元的形成，而在较低的施加载荷下容易形成退火孪晶和位错缠结。通过增加施加的载荷，而不是仅在较低的施加载荷下降低转速，可以进一步提高接头的机械性能。从微观结构演化的角度提出并阐明了铜接头力学性能变化的机理。
The process window for friction stir welding of commercially pure copper was obtained, which included a welding speed ranged from 200 to 800mm/min, a rotation speed ranged from 400 to 1200rpm and an applied load ranged from 1000 to 1500kg. In the stir zone, a remarkably refined microstructure with average grain size of 3.8μm can be obtained by increasing the applied load to 1500kg. In addition, higher applied load can promote the formation of dislocation cells, while annealing twins and dislocation entanglements are easy to form under lower applied load. The mechanical properties of the joints can be improved further by increasing the applied load, rather than only decreasing the rotation speed at lower applied load. The mechanism of the mechanical property changes in the copper joints were put forward and clarified from the viewpoint of microstructural evolution.