LPSO相调控对ECAP挤压Mg-Y-Zn-Al合金组织和力学性能的影响  

Effect of LPSO Phase Control on Microstructure and Mechanical Property of ECAP Processed Mg-Y-Zn-Al Alloy

作　　者：田丰 边丽萍[1,2] 孟棫朴 张红芳 梁伟 TIAN Feng;BIAN Liping;MENG Yupu;ZHANG Hongfang;LIANG Wei(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Advanced Magnesium-based Materials,Taiyuan University of Technology,Taiyuan 030024,China;Science and Technology Talents and Cooperation Center of Shanxi Province,Taiyuan 030021,China;Shanxi Yingguang Huangsheng MagnesiumCompany,Wenxi 043800,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]先进镁基材料山西省重点实验室,山西太原030024 [3]山西省科技人才与科技合作中心,山西太原030021 [4]山西银光华盛镁业公司,山西闻喜043800

出　　处：《热加工工艺》2024年第7期94-97,共4页Hot Working Technology

基　　金：山西省重点研发计划项目(201903D121087);山西省专利推广实施资助专项项目(2019015)。

摘　　要：针对含18R-LPSO相铸态Mg-Y-Zn系合金塑韧性差、变形后力学性能提高有限的问题,研究了固溶、铸态+ECAP挤压和固溶+ECAP对Mg-3.74Y-1Zn-0.5Al(at%)合金力学性能的影响。结果表明,固溶处理诱发18R→14H-LPSO相转变、Al(Y,Zn)相化合物颗粒破碎细化,改善了合金的塑性,但强度几乎不变。铸态+ECAP挤压导致18R-LPSO和Al(Y,Zn)相破碎,并诱发大量α-Mg晶粒发生再结晶。固溶+ECAP挤压使14H-LPSO相弯曲或扭折变形、细小Al(Y,Zn)颗粒均匀分散,仅少数α-Mg晶粒发生再结晶,其强度、塑韧性远高于铸态+ECAP挤压合金的。良好强度、塑韧性匹配的14H-LPSO相的大量形成、α-Mg基体再结晶被抑制及细小Al(Y,Zn)颗粒的均匀分散是其性能提高的主要原因。Aiming at the problems of poor plasticity and toughness of as-cast Mg-Y-Zn alloys containing 18R-LPSO phase and limited improvement of mechanical properties after deformation,the effects of solid solution,as-cast+ECAP extrusion and solid solution+ECAP on mechanical properties of Mg-3.74Y-1Zn-0.5Al(at%)alloy were studied.The results show that the solution treatment induces 18R→14H-LPSO phase transformation and the Al(Y,Zn)phase compound particles are broken and refined,which improves the plasticity of the alloy,but the strength is almost unchanged.Cast+ECAP extrusion leads to the fragmentation of 18R-LPSO and Al(Y,Zn)phases,and induces recrystallization of a large number ofα-Mg grains.Solid solution+ECAP extrusion makes 14H-LPSO bend or kink,fine Al(Y,Zn)particles are uniformly dispersed,and only a few ofα-Mg grains recrystallize,and its strength,ductility and toughness are much higher than those of cast+ECAP alloy.The main reasons for the improved performance are the large formation of 14H-LPSO phase with good strength-plasticitytoughness matching,the suppressed recrystallization ofα-Mg matrix and the uniformdispersion of fine Al(Y,Zn)particles.

关 键 词：Mg-Y-Zn-Al合金 LPSO相 等通道转角挤压(ECAP) 力学性能 

分 类 号：TG379[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]