Microstructures and mechanical properties evolution of an Al-Fe-Cu alloy processed by repetitive continuous extrusion forming
Microstructures and mechanical properties evolution of an Al-Fe-Cu alloy processed by repetitive continuous extrusion forming
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DOI：
10.1016/j.msea.2014.06.038
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发表时间：
2014-08-26
期刊：
影响因子：
6.4
通讯作者：
Ji, Xiankun
中科院分区：
文献类型：
--
作者：
Kong, Xiangxin;Zhang, Hui;Ji, Xiankun
对水平连铸Al-0.74Fe-0.23Cu合金进行了连续剧烈塑性变形的重复连续挤压成形（R-Conform）工艺。采用光学显微镜、X射线衍射仪、扫描电镜、透射电镜和拉伸试验等手段研究了复合材料的组织演变和力学性能。结果表明，经过多次Conform变形后，Al-0.74Fe-0.23Cu合金的拉伸塑性得到了很大的提高，但抗拉强度却逐渐下降。随着共形道次的增加，颈缩更加强烈，韧窝的尺寸变得更大。第一道次随形变形明显细化了晶粒，使AlFe、AlFeSi和AlSi初生相溶解，产生应变诱导析出，并改变了晶向分布，而进一步随形变形仅改变了析出相的再分布。力学性能的变化可能是由于回复、再结晶和析出相再分布的复杂过程。(C)2014爱思唯尔有限公司版权所有。
Repetitive continuous extrusion forming process (R-Conform process), as a continuous severe plastic deformation method, was performed on a horizontal continuous casting Al-0.74Fe-0.23Cu alloy. The microstructural evolution and mechanical properties were studied by optical microscope, X-ray diffraction, scanning electron microscope, transmission electron microscope, and tensile testing. The results show that tensile ductility of the Al-0.74Fe-0.23Cu alloy is greatly improved but tensile strength is gradually decreased after repetitive Conform processing. The necking is more intense and the size of dimples becomes bigger with increasing Conform passes. The first pass Conform process induces obviously grains refining, dissolution of AlFe, AlFeSi and AlSi primary phases, strain-induced precipitation and transformation of crystal orientation distributions, but further Conform deformation only changes the redistribution of precipitates. The changes of mechanical properties may be attributed to a complex progress of recovery, recrystallization and redistribution of precipitates during repetitive Conform process. (C) 2014 Elsevier B.V. All rights reserved.