Y对AZ91D镁合金阻尼性能的影响  

Influence of Y on Damping Capacity of AZ91D Alloy

作　　者：马戎[1] 董选普[1] 程鲁[1] 张磊[1] 樊自田[1] 

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,湖北武汉430074

出　　处：《铸造》2011年第3期283-286,共4页Foundry

基　　金：华中科技大学材料成型与模具技术国家重点实验室自主课题(课题编号09-3)

摘　　要：通过DMA等手段研究了Y元素对AZ91D镁合金阻尼性能的影响,并通过扫描电镜、X射线衍射、透射电镜等手段研究了不同Y含量下AZ91D合金的显微组织,在此基础上分析了显微组织与阻尼性能的关系。结果显示:Y元素能明显细化AZ91D合金的组织,随着Y含量的增加,β相逐渐变得细小、弥散,且合金中会出现弥散分布的Al2Y相,根据G-L位错模型理论,固溶在α-Mg基体中的Y原子对合金中的位错线构成弱钉扎,Al2Y等含Y合金相对合金中位错线构成强钉扎,且组织细化后合金中位错线相互缠结,导致AZ91D合金阻尼性能下降明显。The dynamic mechanical analyzer was employed to investigate the influence of Y on damping capacity of AZ91D alloy,and the microstructure of AZ91D alloy with different content of Y was studied by using of SEM,XRD and TEM,upon which the relationship between microstructure and damping capacity of AZ91D alloy was discussed and analyzed.The results show that the grain size was significantly refined by Y element;with the increasing content of Y,the β phase turned to be tiny and decentralized and the Al2Y phase began to appear in the alloy.The damping behavior of the AZ91D alloy modified with Y can be explained with the G-L model：those Y atoms soluted in the α-Mg matrix brought weak nail effect while the Al2Y phase brought strong nail effect on the dislocations in the alloy;meanwhile,the dislocations twined with each other after the grain refinement,which resulted in an obvious decrease in damping capacity of the AZ91D alloy.

关 键 词：AZ91D Y合金化 阻尼性能 位错 G-L模型 

分 类 号：TG146.22[一般工业技术—材料科学与工程]