热等静压对低压铸造WE43镁合金组织和室温及高温力学性能的影响  

Effect of hot isostatic pressing on microstructure,room temperature and high temperature mechanical properties of low-pressure casting WE43 magnesium alloy

作　　者：田晓莹 魏健雄 闫宏 陈荣石[2] TIAN Xiao-ying;WEI Jian-xiong;YAN Hong;CHEN Rong-shi(School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]中国科学技术大学材料科学与工程学院,辽宁沈阳110016 [2]中国科学院金属研究所,师昌绪先进材料创新中心,辽宁沈阳110016 [3]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《材料热处理学报》2023年第10期87-95,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(5227110701193,51701218);山东省自然科学基金(ZR2021ME241);辽宁省自然科学基金(2020-MS-004);国家重点研发计划(2016YFB0301104)。

摘　　要：采用低压金属型铸造方法制备了WE43(Mg-4.1Y-2.3Nd-1.5Gd-0.5Zr)镁合金,对其进行了热等静压处理。利用光学显微镜、扫描电镜、能谱仪和拉伸试验等分析了合金的显微组织和室温及高温下的力学性能,研究了热等静压对低压铸造WE43镁合金组织和力学性能的影响。结果表明:低压铸造得到的WE43合金晶粒细小,时效态合金的屈服强度为(197.7±1.2)MPa、抗拉强度为(287.0±12.0)MPa、断后伸长率为(6.7±3.1)%。热等静压显著提高了合金的抗拉强度与塑性,经过热等静压之后,时效态合金的屈服强度为(199.0±2.0)MPa、抗拉强度为(306.7±7.8)MPa、断后伸长率为(8.0±1.7)%。由低压铸造-热等静压工艺制备的WE43合金在室温至250℃范围内表现出优异的力学性能,其原因是合金具有细小的晶粒组织以及消除了缩松缩孔。WE43(Mg-4.1Y-2.3Nd-1.5Gd-0.5Zr)magnesium alloy was prepared by low-pressure metal mold casting,and was treated by hot isostatic pressing.Microstructure and room temperature and high temperature mechanical properties of the alloy were analyzed by means of optical microscope,scanning electron microscopy,energy dispersive spectrometer analysis and tensile testing.The effect of hot isostatic pressing on the microstructure and mechanical properties of the low-pressure casting WE43 magnesium alloy was studied.The results show that the WE43 alloy obtained by low-pressure casting has fine grains,and the yield strength,tensile strength and elongation of the aged alloy are(197.7±1.2)MPa,(287.0±12.0)MPa and(6.7±3.1)%,respectively.The hot isostatic pressing can significantly improve the tensile strength and plasticity of the alloy.After hot isostatic pressing,the yield strength of the aged alloy is(199.0±2.0)MPa,the tensile strength is(306.7±7.8)MPa,and the elongation is(8.0±1.7)%.The WE43 alloy prepared by low-pressure casting+hot isostatic pressing process shows excellent mechanical properties in the range of room temperature to 250℃,which is due to the fine grain structure of the alloy and the elimination of shrinkage porosity and pores.

关 键 词：WE43镁合金 热等静压 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]