铝合金等径角挤压和多向压缩变形中析出相的回溶研究  

Investigation on dissolution of precipitates in Al alloy deformed by equal-channel angular pressing and multi-axial compression

作　　者：党朋[1] 许晓嫦[1] 刘志义[1] 于文斌[1] 宁爱林[2] 曾苏民[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]邵阳学院机械工程系,湖南邵阳422004

出　　处：《材料热处理学报》2007年第5期82-85,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助项目(50571069);湖南省自然科学基金资助项目(05JJ40005)

摘　　要：利用透射电镜(TEM)研究了等径角挤压(ECAP)和多向压缩(MAC)两种强塑性变形方式对Al-Cu合金中θ′相变形过程中演变。结果表明,随着应变量的增加,析出相先是与基体失去位向关系,随后破碎、回溶。在相同应变量下,MAC变形使析出相回溶的速度明显高于ECAP变形。应变引起析出相回溶受界面反应型回溶机理和界面弯曲效应机理共同作用。The evolution of precipitates in AI-Cu alloy subjected to equal-channel angular pressing （ECAP） and multi-axial compression （MAC） were investigated by transmission electron microscopy （TEM）. The results indicate that precipitates firstly lose the orientation relationship with matrix, subsequently it fragments and dissolves. The velocity of dissolution of θ phase in the ECAP alloy is much higher than that in the MAC alloy at same strain. The mechanisms of the strain-induced dissolution of precipitates is ascribed to the concurrent effects of interface reaction and interface curvature.

关 键 词：等径角挤压(ECAP) 多向压缩(MAC) AL-CU合金 析出相 回溶 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG376[金属学及工艺—金属材料]