半固态重熔加热工艺对镁合金组织与耐蚀性能的影响  

Effects of Semi-Solid Remelting Heat Treatment on Microstructure and Corrosion Resistance of As-Cast AZ91 Magnesium Alloys

作　　者：万迪庆[1] 

机构地区：[1]华东交通大学机电工程学院,江西南昌330013

出　　处：《铸造》2012年第6期666-668,共3页Foundry

基　　金：江西省自然科学基金项目(20114BAB216015);江西省教育厅科技项目资助(GJJ12320)

摘　　要：详细研究了半固态重熔加热工艺参数对AZ91D镁合金半固态组织演变及其耐蚀性的影响。结果表明:AZ91D镁合金在液固双相区进行重熔处理时,合金中低熔点共晶组织首先发生熔化并隔离α-Mg树枝晶,其后被隔离的粗大α-Mg树枝晶逐步演化成为类球晶甚至发生合并长大现象。不同半固态重熔加热工艺参数对组织演化过程影响明显。The effects of semi-solid remelting heat treatment on the microstructure and corrosion resistance of AZ9lD magnesium alloys were detailedly carried out.The results show that the low-melting eutectic phase primarily melted and separated the α-Mg dendrites when AZ91D magnesium alloy was isothermally-treated at the semi-solid temperature;then the large separate α-Mg dendrites evolved into the spherical grains and even merging growth occurred.The effects of remelting technological parameters on evolution process were obvious.

关 键 词：AZ91D镁合金 半固态重熔加热处理 金相组织 耐蚀性 

分 类 号：TG292[金属学及工艺—铸造]