Mg-Al-Cu系砂型铸造镁合金组织和性能研究  

An Investigation of Properties and Microstructures of Mg-Al-Cu Sand-Cast Magnesium Alloys

作　　者：郝启堂[1] 杨光昱[1] 介万奇[1] 何志[1] 李杰华[1] 

机构地区：[1]西北工业大学,陕西西安710071

出　　处：《稀有金属材料与工程》2007年第4期671-675,共5页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划"973"项目(2006CB605202)

摘　　要：设计了Mg-Al-Cu系的3种新合金AC33,AC53和AC63。发现3种实验合金的相组成相同:δ-Mg基体+(δ-Mg+Mg2Al2Cu3)共晶+(δ-Mg+Mg17Al12+Mg2Al2Cu3)三元共晶。实验合金的室温力学性能优良。3种实验合金在200℃,50MPa条件下的蠕变抗力明显优于AZ91C合金,其中AC53合金的抗高温蠕变性能最优。Cu从以下途径影响了Mg-xAl合金的蠕变特性:Cu的添加抑制了Mg17Al12相的析出,使合金耐热性提高。该系列实验合金单从力学性能和抗蠕变性能来看,是非常有发展潜力的。The microstructures and mechanical properties of AC33, AC53 and AC63 alloys were investigated. It is found that the phase constitutions of all three experimental alloys are the same, i.e. δ-Mg, Mg17Al12 and Mg2Al2Cu3.The ambient temperature mechanical properties of sand-cast experimental alloys are suitable for the demands of the general structural parts. The creep resistances of the experimental alloys are apparently better than that of AZ91C. The elevated temperature creep rate of AC53 alloy is the lowest among them The effects of Cu addition on the elevated temperature creep behaviors could be explained as follows： Addition of 3%Cu in Mg-（3-6）%Al alloys suppresses forming of Mg17Al12 phase, which might play an important role on the creep behavior.

关 键 词：镁合金 显微组织 砂铸 力学性能 退火 蠕变 

分 类 号：TG146.22[一般工业技术—材料科学与工程]