挤压变形对Mg-4Zn-3Cu合金组织与力学性能的影响  

Effect of extrusion deformation on the microstructure and mechanical properties of Mg-4Zn-3Cu alloy

作　　者：邹超 Zou Chao(College of Materials Science and Engineering,Xi′an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055

出　　处：《轻金属》2024年第6期35-38,共4页Light Metals

基　　金：陕西省自然科学基金青年项目资助(2023-JC-QN-0605)。

摘　　要：采用半连续铸造Mg-4Zn-3Cu合金铸锭进行了420℃×24h均匀化退火,系统研究了不同温度下二次挤压变形对合金显微组织及力学性能的影响。结果表明,采用挤压加工的方法可提高铸态Mg-4Zn-3Cu合金的组织及力学性能,挤压变形后的合金具有大量孪晶,这是由于孪生机制是合金挤压塑性变形过程中重要的变形机制。在360℃二次挤压后的合金强度最高,抗拉强度为277MPa,屈服强度为181MPa。这是因为在低温挤压时,相比于晶粒细化的强化作用,织构弱化作用是主导因素。因此,在260℃下二次挤压的Mg-4Zn-3Cu合金强度较低。A DC casting Mg-4Zn-3Cu alloy billet was subjected to homogenization annealing at 420℃for 24 hours.The effect of secondary extrusion deformation at different temperatures on the microstructure and mechanical properties of the alloy was systematically studied.The results indicate that extrusion processing can effectively improve the microstructure and mechanical properties of as cast Mg-4Zn-3Cu alloy.The alloy after extrusion deformation has a large number of twinning,which is an important deformation mechanism in the alloy extrusion plastic deformation process.The alloy has the highest strength after secondary extrusion at 360℃,with a tensile strength of 277 MPa and a yield strength of 181 MPa.The strength of Mg-4Zn-3Cu alloy after secondary extrusion at 260℃is lower,because the weakening effect of texture formed during low-temperature extrusion exceeds the strengthening effect of grain refinement.

关 键 词：Mg-4Zn-3Cu 挤压 显微组织 力学性能 

分 类 号：TF821[冶金工程—有色金属冶金] TG502.16[金属学及工艺—金属切削加工及机床]