微量元素Sb对AZ31合金组织与蠕变性能的影响  

Effect of Sb additions on microstructure and creep properties of AZ31 Mg-alloy

作　　者：杨景红[1] 田素贵[1] 于兴福[1] 张禄廷[1] 孙根荣 金敬铉 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110023 [2]韩国机械与材料研究院材料技术部

出　　处：《沈阳工业大学学报》2005年第3期257-260,273,共5页Journal of Shenyang University of Technology

基　　金：辽宁省自然科学基金资助项目(20022033)

摘　　要：通过蠕变曲线的测定、x 射线衍射分析及SEM、TEM形貌观察,研究了微量元素Sb对AZ31合金的组织结构及蠕变性能的影响.结果表明:在AZ31合金中加入元素Sb后,有效降低了合金应变量及稳态应变速率.当加入0 84%Sb后,使合金的稳态蠕变速率降低了2 5倍,显著提高了合金的蠕变寿命.高体积分数(～20%)第二相的存在,特别是合金中弥散分布高熔点的Mg3Sb2相,在高温蠕变期间可有效地阻碍位错运动,也是该合金具有较好蠕变抗力的主要原因.The effect of antimony (Sb) addition on the microstructure and creep properties of AZ31 alloy have been studied by means of measuring of creep curves and observation of SEM and TEM. Results show that a small amount of antimony addition to AZ31 alloy decreases the strain extension and strain rate during the initial and steady state creep. The steady state creep rate of AZ31 alloy was reduced 2.5 times by the addition of 0.84% antimony by weight, so that enhance the creep lifetime of the alloy. The enhanced creep resistance is due to the presence of high volume fraction (～20%) of second phases. Especially, a large number of Mg3Sb2 phase precipitated and homogeneously distributed in matrix of the alloy, which (effectively) hindered the movement of dislocations during elevated temperature creep.

关 键 词：元素Sb AZ31合金 组织结构 位错 蠕变抗力 

分 类 号：TG113.25[金属学及工艺—物理冶金]