深冷处理对Mg-2Zn-0.5Y合金组织与拉伸性能的影响  

Effects of Cryogenic Treatment on Microstructure and Tensile Properties of Mg-2Zn-0.5Y Alloy

作　　者：户燕会 张洁溪[2] 户东亮 HU Yanhui;ZHANG Jiexi;HU Dongliang(Sino-German College of Applied Sciences,Tongji University,Shanghai 201804,China;School of Mechanical Engineering,He'nan Polytechnic Institute,Nanyang 473000,China;Nanyang Thermal Power Co.,Ltd.,State Power Investment Corporation,Nanyang 473000,China)

机构地区：[1]同济大学中德工程学院,上海201804 [2]河南工业职业技术学院机械工程学院,河南南阳473000 [3]国电投南阳热电有限责任公司,河南南阳473000

出　　处：《热加工工艺》2024年第17期137-139,145,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51675383)。

摘　　要：对挤压态Mg-2Zn-0.5Y合金进行不同时间的深冷处理,采用OM、SEM、XRD、拉伸试验研究了不同时间深冷对Mg-2Zn-0.5Y组织与拉伸性能的影响。结果表明:挤压态Mg-2Zn-0.5Y合金组织主要为α-Mg与少量W相。随着深冷时间的增加,合金中晶粒尺寸没有发生明显变化,W相析出量逐渐增多;深冷12 h后,Mg-2Zn-0.5Y合金中W析出相体积分数为5.33vol%。深冷处理对Mg-2Zn-0.5Y合金的抗拉强度无明显影响,但可以显著提高合金的塑性。深冷1 h的Mg-2Zn-0.5Y合金的伸长率达到17.4%,比挤压态合金的伸长率提高142%。The extruded Mg-2Zn-0.5Y alloy was subjected to cryogenic treatment at different time.The effects of cryogenic treatment at different time on the microstructure and tensile properties of Mg-2Zn-0.5Y alloy were studied by OM,SEM,XRD and tensile test.The results show that the microstructure of as extruded Mg-2Zn-0.5Y alloy is mainly composed ofα-Mg and a small amount ofWphase.With the increase of cryogenic time,the grain size ofMg-2Zn-0.5Y alloy has no obvious change,and the precipitation amount ofWphase increases gradually.The volume fraction ofWphase in Mg-2Zn-0.5Y alloy is 5.33vol%after cryogenic for 12 h.Cryogenic treatment has no obvious effect on the tensile strength of Mg-2Zn-0.5Y alloy,but can significantly improve the plasticity of the alloy.The elongation of Mg-2Zn-0.5Y alloy after cryogenic treatment for 1 h is 17.4%,which is 142%higher than that of extruded alloy.

关 键 词：Mg-2Zn-0.5Y合金 深冷处理 组织 拉伸性能 

分 类 号：TG156.91[金属学及工艺—热处理]