多道次ECAP挤压对纯铜拉伸行为影响的实验研究  

Experimental investigation on tension hardening behavior of pure copper under multi-pass of ECAP

作　　者：许凌波[1] 黄世鸿[1] 靳丽莉[1] 袁秋平[1] 张克实[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2012年第4期803-807,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(11072064;90815001);广西理工科学实验中心重点项目(LGZX201101)

摘　　要：为了解不同道次等通道转角挤压(ECAP)对材料拉伸屈服和硬化的作用,以纯铜棒材试样为研究对象,实验研究了经多道次ECAP后材料的单轴拉伸屈服和硬化行为,并进一步探讨了退火对ECAP后材料力学性能的影响,得到以下结论:①挤压道次相同的情况下,经退火/空冷处理后材料硬化更为充分;②一道次挤压对材料的硬化作用远大于后续道次;③在材料挤压后实施了退火的情形,四道次后的挤压对材料不再有明显的硬化作用。这一研究有助于人们更深入地了解ECAP对材料力学行为的影响。In order to investigate the influence （ECAP） on the yielding and hardening of a metal, the experimental investigations on the yielding and of muhi-pass equal channel angular pressing pure copper was used as hardening behavior of the a target material, and material samples after multi-pass of ECAP were carried out. The analyses of influence on the mechanical characteristics of annealing after ECAP were conducted. The main conclusions are： （1） more strengthening can be ex- pected if annealing / air-cold treatment is adopted under the condition that the ECAP pass number is the same; （2） the strengthening effect of the first pass of ECAP is much greater than that of the sub- sequent ECAP passes; （3） if the annealing treatment is applied, the strengthening effect due to ECAP after four passes will be very small. These results are helpful for people to understand the in- fluence of multi-pass ECAP on the mechanical behavior of metals.

关 键 词：纯铜 等通道转角挤压(ECAP) 屈服与硬化 退火 

分 类 号：O346.12[理学—固体力学]