AZ80镁合金半固态等温处理过程中的组织演变  

Microstructures Evolution of AZ80 Magnesium Alloy in Semi-solid Isothermal Treatment Process

作　　者：孙兵[1] 张英波[1] 权高峰[1] 李彬[1] 

机构地区：[1]西南交通大学,四川成都610031

出　　处：《稀有金属材料与工程》2016年第2期404-408,共5页Rare Metal Materials and Engineering

基　　金：中央高校基本科研业务费专题研究项目(SWJTU11ZT30;SWJTU11CX050);轨道交通国家实验室(筹)重点项目(2012A0101)

摘　　要：对挤压态AZ80镁合金进行了不同时间的等温处理,观察分析了半固态微观组织的演变规律与晶内液池的形成过程。结果表明:在等温过程中,组织演变过程主要表现为晶粒合并粗化、晶界局部液相出现和液相区扩大、α-Mg晶粒球化转变、熟化与合并长大几个阶段。挤压AZ80镁合金半固态等温处理过程中α-Mg晶粒内液池出现机制以α-Mg晶内溶质元素富集处发生局部优先熔化为主。This paper deals with the evolution law of microstructure and formation process of intracrystalline liquid pool of extruded AZ80 magnesium alloy after semi-solid isothermal treatment（SST） for different time. The result show that in the semi-solid isothermal process, coarsening and merger of grains occur firstly, and then liquid phase appears and expands; with the increase of isothermal holding time, the α-Mg grains are separated by liquid phase and tend to spheroid constantly. Ostwald ripening and grain coalescing will become the main mechanism with the holding time increasing. And the partial melting priority due to the solution elements enrichment is the main mechanism of intracrystalline liquid pool inside the α-Mg grain.

关 键 词：AZ80 组织演变 晶内液相 

分 类 号：TG146.22[一般工业技术—材料科学与工程]