Mg-2Nd合金的组织与抗蠕变性能  

Microstructure and Creep Resistance of Mg-2Nd Alloy

作　　者：晏井利[1] 孙扬善[1] 薛烽[1] 白晶[1] 陶卫健 

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]南京云海特种金属有限公司,江苏南京211221

出　　处：《铸造》2007年第8期805-808,共4页Foundry

基　　金：江苏省自然科学基金(BK2004208);东南大学优秀博士学位论文基金

摘　　要：研究了Mg-2Nd合金的铸态显微组织、力学性能和抗蠕变性能。结果表明:Mg-2Nd合金的铸态组织由α-Mg基体和分布于晶界的离异共晶相Mg12Nd组成;铸态Mg-2Nd合金的抗拉强度和屈服强度随温度的增加而下降,但下降的幅度不大,具有较好的高温稳定性,伸长率则随温度增加明显上升;铸态Mg-2Nd合金表现出良好的抗蠕变性能。通过计算,合金在150～250℃、30～110MPa下的应力指数为3.3～8.0,蠕变激活能在108～142kJ/mol的范围。合金的蠕变机制归结于位错攀移控制,晶界滑移起一定的作用。Microstructure, mechanical properties and creep resistance of as-cast alloy Mg-2Nd were studied. The as-cast microstructure consists of the dendritic α-Mg and divorced eutectic Mg12Nd distributing along the grain boundaries. Both tensile strength and yield strength decrease slightly but the ductility increase obviously with the increase of the temperature. The as-cast alloy exhibits good creep resistance. The stress exponent value of 3.3-8.0 and apparent activation energy value of 108-142kJ/mol obtained at 150-250 ℃ and applied stress 30-110 MPa suggest that the creep is dislocation climb controlled while grain boundary sliding has some effect.

关 键 词：Mg-2Nd合金 显微组织 力学性能 抗蠕变性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]