AZ91镁合金挤压过程中β相的动态析出及其对组织和拉伸性能的影响  

Dynamic Precipitation of β Phase during Extrusion Process and Its Effects on the Microstructures and Tensile Properties of AZ91 Magnesium Alloy

作　　者：刘六法[1] 丁汉林[1] 丁文江[1] 

机构地区：[1]上海交通大学,上海200030

出　　处：《稀有金属材料与工程》2009年第1期104-109,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50505026);上海市自然科学基金(05ZR14075)项目资助

摘　　要：研究了AZ91镁合金挤压变形过程中β相的动态析出行为及其对合金组织和拉伸性能的影响。结果表明,AZ91镁合金的力学性能在挤压后显著提高。合金在挤压过程中有大量β相粒子动态析出,且析出特征与挤压温度、挤压比等工艺参数密切相关。β相粒子的动态析出对合金拉伸性能的直接作用有限,主要通过影响动态再结晶而影响组织演变,并进而影响合金性能。通过控制工艺过程能够有效调整β相粒子的析出,使合金力学性能得到进一步提升。The dynamic precipitation of the β phase in AZ91 magnesium alloy during extrusion process and its effects on the microstructures and tensile properties of the alloy are studied. It is found that the mechanical properties are effectively improved by the extrusion process and the dynamic precipitation of the β phase occurs during the extrusion process. The characteristics of precipitation are influenced by the extrusion temperature and extrusion ratio. The dynamically precipitated β phase has a limited direct effect on the tensile properties. The effects of β phase on the tensile properties come from its influence on the microstructure evolution through the dynamic crystallization. The authors consider that the mechanical properties of AZ91 can be further improved by controlling the working processes to optimize the precipitation characteristics of the β phase.

关 键 词：镁合金 AZ91 Β相 挤压 塑性变形 

分 类 号：TG146.22[一般工业技术—材料科学与工程]