田佳,李建平,白亚平,郭永春,杨忠

• 1:西安工业大学材料与化工学院

摘要(Abstract)：

通过对粉末冶金法制备的7075铝合金在150~400℃进行1~4道次等通道挤压(ECAP),采用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)分析了挤压工艺对7075铝合金显微组织和力学性能的影响。研究表明:挤压后7075铝合金试样表面的光滑度随着挤压温度的升高显著提高。随着ECAP温度的升高,7075铝合金的抗拉强度先升高后降低,伸长率变化趋势相反,ECAP温度为250℃时,7075铝合金综合性能最佳。随着ECAP道次的增加,合金致密度、硬度及室温抗拉强度明显提高,伸长率先降低后提高;在2道次ECAP后,由于细晶强化与位错强化的双重作用,合金抗拉强度达到375 MPa。

关键词(KeyWords)： 等通道挤压(ECAP);7075铝合金;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家基础科学发展基金(2012CB619602-3,2012CB619602-2 );; 陕西省教育基金(04JK211,2012JC13);; 西安交通大学金属材料强度国家重点实验室开放研究项目(20141602);; 西安工业大学校长基金(XAGDXJJ15010);; 陕西省科技厅计划(2016JQ5071);; 重大科技成果转化引导专项(2013KTCG01-04)

作者(Author): 田佳,李建平,白亚平,郭永春,杨忠

DOI: 10.13289/j.issn.1009-6264.2016.07.010

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