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
田丰 1边丽萍 2孟棫朴 3张红芳 4梁伟2
作者信息
- 1. 太原理工大学 材料科学与工程学院,山西 太原 030024
- 2. 太原理工大学 材料科学与工程学院,山西 太原 030024;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
- 折叠
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.
Abstract
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 of α-Mg grains.Solid solution+ECAP extrusion makes 14H-LPSO bend or kink,fine Al(Y,Zn)particles are uniformly dispersed,and only a few of α-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-plasticity-toughness matching,the suppressed recrystallization of α-Mg matrix and the uniform dispersion 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Key words
Mg-Y-Zn-Al alloy/LPSO phase/equal channel angular pressing(ECAP)/mechanical properties引用本文复制引用
基金项目
山西省重点研发计划(201903D121087)
山西省专利推广实施资助专项(2019015)
出版年
2024
NETL
NSTL
万方数据