等通道转角挤压Al-4%Mg-0.5%Ce合金的力学性能  

Mechanical properties of Al-4%Mg-0.5%Ce aluminum alloy subjected to equal channel angular pressing

作　　者：李锋[1] 李英杰[1] 王鑫[1] 陈立佳[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110178

出　　处：《沈阳工业大学学报》2009年第2期168-172,共5页Journal of Shenyang University of Technology

基　　金：辽宁省自然科学基金资助项目(20072046)

摘　　要：为了确定等通道转角挤压对Al-4%Mg-0.5%Ce合金力学性能的影响规律,针对经过不同道次和路径等通道转角挤压的Al-4%Mg-0.5%Ce合金的硬度及其在不同应变速率和实验温度下的拉伸性能进行了研究,同时也针对等通道转角挤压Al-4%Mg-0.5%Ce合金的拉伸断口形貌进行了观察与分析.结果表明,等通道转角挤压可使Al-4%Mg-0.5%Ce合金的硬度由HB44提高到HB51.3,等通道转角挤压Al-4%Mg-0.5%Ce合金在不同实验温度和应变速率下的断裂伸长率和屈服强度主要取决于所采用的挤压道次和路径,经过不同道次和路径等通道转角挤压的Al-4%Mg-0.5%Ce合金在拉伸加载条件下呈现典型的韧性断裂特征,具有优异的塑性变形能力.In order to determine the influence of equal channel angular pressing （ECAP） on the mechanical properties of the Al-4% Mg-0. 5% Ce alloy, the hardness and tensile properties at different strain rates and testing temperatures were investigated for the Al-4% Mg-0.5% Ce alloys subjected to ECAP with various routes and passes. In addition, the morphology of the tensile fracture surfaces was observed using scanning electron microscope. The experimental results reveal that equal channel angular pressing can increase the hardness of the Al-4% Mg-0. 5% Ce alloy from HB44 to HB51.3. The elongation to failure and yield strength of the ECAPed Al-4% Mg-0. 5% Ce alloys at different strain rate and testing temperatures is mainly dependent on the pressing route and pass. The Al-4% Mg-0. 5% Ce alloys subjected to ECAP with different routes and passes exhibits the typical ductile fracture feature under tensile loading condition, and possess the excellent plasticity

关 键 词：铝合金 等通道转角挤压 硬度 断裂伸长率 屈服强度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]