真空压铸AT72合金的热处理强化能力分析  

Strengthening Capacity of AT72 Magnesium Alloy after Heat Treatment

作　　者：孔庆富[1] 王柏树[1] 寇首鹏 熊守美[2] 

机构地区：[1]长春工业大学材料科学与工程学院 [2]清华大学材料学院

出　　处：《特种铸造及有色合金》2014年第12期1281-1284,共4页Special Casting & Nonferrous Alloys

基　　金：长春工业大学科学研究发展基金资助项目(2012LG05);国家高技术研究发展计划(863计划)资助项目(2009AA03Z114)

摘　　要：对真空压铸AT72合金铸态和热处理态的力学性能和拉伸断口进行了研究,与AZ91D的热处理强化进行了对比。结果表明,AT72合金热处理强化效果不明显。拉伸断口分析显示,AT72合金压铸态和时效态的断裂模式主要是沿晶解理断裂;固溶处理和固溶加时效处理的合金的断裂模式则是穿晶解理断裂,而且除了表层,心部很大部分裂纹扩展发生在缩孔、缩松处。Mechanical properties and fracture morphology of the as-cast and heat treated （HPDC） vacuum die casting AT72 magnesium alloy were measured and analyzed, and they were compared with those of AZglD alloy. The results reveal that heat treatments can not exhibit a desirable strengthening effects on the AT72 alloy, and the fracture mode of the HPDC and T5 treated AT72 alloy is mainly characterized by intergranular cleavage fracture, while the fracture mode of the T4 and T6 treated AT72 alloy is main- ly characterized by trans-granular cleavage mode, and most of heart cracks are propagated across shrink- ages and holes besides the superficial shell for all AT72 alloys.

关 键 词：AT72合金 压铸 热处理 拉伸断口 

分 类 号：TG166.4[金属学及工艺—热处理] TG249.2[金属学及工艺—金属学]