等通道角挤压对高纯铝力学性能的影响  

Influence of equal channel angular extrusion on mechanical property of high purity aluminum

作　　者：高松松[1] 王进[1] 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033

出　　处：《锻压技术》2015年第8期132-134,139,共4页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51205217)

摘　　要：对高纯铝分别进行了Bc路径和C路径的等通道角挤压,采用显微维氏硬度计测试硬度,研究结果表明,经过4道次挤压后,Bc路径试样硬度达到59.8 HV,C路径试样硬度达到54.56 HV。并分析了ECAP实验对材料拉伸性能的影响。经过8道次挤压后,高纯铝的抗拉强度提高了100%,在第3道次达到最大值,为108 MPa。伸长率在第1道次后剧烈下降,由44%下降至18.3%,随后又略有上升。进行了热稳定性实验,分别将试样加热到100和200℃,保温1 h。结果表明,退火后高纯铝的硬度和抗拉强度都有所下降,不同的退火温度对硬度的影响几乎相同,而对抗拉强度的影响差别较大。The high purity aluminum was extruded through routes Bc and C by equal channel angular extrusion （ECAE）, and their micro-hardness values were measured by a leitzs micro-hardness tester. The results show that the hardness values can reach 59.8 HV and 54. 56 HV by routes Bc and routes C respectively via four pass extrusion, and the influences of ECAE tests on tensile properties are studied. The tensile strength improves by 100% after eight pass extrusion. At the third pass, the tensile strength reaches the maximum of 108 MPa. Elongation drops from 44% to 18. 3% dramatically after the first pass, and then increases slightly. The thermal stability tests were conducted by heating samples of 100 ℃and 200 ℃ with preserving for 1 hour respectively. The results show that the hardness and the tensile strength of the high purity aluminum after annealing decrease, and the influence of different annealing temperatures on the hardness is almost the same, but that on the tensile strength is different.

关 键 词：高纯铝 等通道角挤压 力学性能 热稳定性 

分 类 号：TG379[金属学及工艺—金属压力加工]