材料工程Issue(12)：39-44,6.
热处理对GWZ661变形镁合金组织与性能的影响
Effect of Heat Treatment on Microstructures and Mechanical Properties of Extruded GWZ661 Alloy
摘要
Abstract
A quaternary alloy with composition of Mg-6Gd-6Y-lZn (mass fraction/%) was prepared by conventional casting and extrusion. The microstructure and aging behavior of the alloy were investigated. The results showed that the as-cast microstructure of the alloy consisted of the rMg matrix, Mg24(GdYZn)5 eutectic and Mg12 Y1 Zn1 phase. After extrusion the Mg12Y1Zn1 phase were stretched along the direction of extrusion, and the 14H-LPSO phase distributed between Mg12Y1Zn1 strips. Solid solution treatment at high temperature above 500℃ resulted in the dissolution of Mg12Y1Zn1 phase into the matrix and increase of the 14H-LPS0 phase. When solution treated alloys was aged at temperature of 225°C (T6 treatment), the 14H-LPSO phase and β' precipitated appear in microstructure. Aging of as extruded alloys (T5 treatment) also caused the formation of β' precipitates, however the volume fraction of 14H-LPSO phase was lower than that in specimens after T6 treatment. High tensile strength combined with good ductility was obtained from the alloy after T6-aging.关键词
镁合金/钆/钇/锌/时效/长周期相Key words
magnesium alloy/gadolinium/yttrium/zinc/aging/long-period staking ordered phase分类
矿业与冶金引用本文复制引用
甄睿,孙扬善,王章忠,方信贤,石卫..热处理对GWZ661变形镁合金组织与性能的影响[J].材料工程,2012,(12):39-44,6.基金项目
江苏省大学生实践创新训练计划资助项目(201211276313) （201211276313）
南京工程学院大学生科技创新基金资助项目(20120215) （20120215）
