ZA84镁合金在半固态等温热处理过程中的组织演变  

Microstructural Evolution of ZA84 Magnesium Alloy During Semi-solid Isothermal Heat Treatment

作　　者：杨明波[1] 沈佳[1] 白亮[2] 潘复生[2] 

机构地区：[1]重庆工学院材料科学与工程学院 [2]重庆大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第9期690-692,共3页Special Casting & Nonferrous Alloys

基　　金：重庆市科技攻关项目(CSTC-2006AA4012-9-6);重庆市自然科学基金资助项目(2007BB4400)

摘　　要：研究了ZA84镁合金在半固态等温热处理过程中的组织演变。研究结果表明,通过半固态等温热处理制备非枝晶组织ZA84合金是可能的。当ZA84合金经570℃×120min半固态等温热处理后,可获得液相率为22%和未熔初生相颗粒尺寸为57μm的非枝晶组织。ZA84合金在半固态等温热处理过程中的组织演变主要包括最初的粗化、组织分离和球化3个阶段,没有发现球状晶粒最后的粗化。Microstructural evolution of ZA84 magnesium alloy during semi-solid isothermal heat treatment has been observed by SEM (scanning electron microscope) and OM (optical microscope). It is revealed that it is possible for preparing ZA84 magnesium alloy with non-dendrite structure by semi-solid isothermal heat treatment. After treated at 570 ℃ for 120 min,the non-dendrite structure with 22% liquid phase and un-melted primary solid phase with average size in 57 μm can be observed in the ZA84 alloy. Furthermore,the microstructural evolution of ZA84 magnesium alloy during semi-solid isothermal heat treatment exhibits coarse in beginning,then phase separation and shperoidization,and the final coarsening of spheriodized grain is absent.

关 键 词：镁合金 ZA84镁合金 半固态 半固态等温热处理 

分 类 号：TG249.9[金属学及工艺—铸造]