Zn含量对铸态Mg-Dy合金显微组织和力学性能的影响

发布时间：2018-05-08 13:00

  本文选题：Mg-Dy-Zn合金 + 显微组织　； 参考：《中国有色金属学报》2015年04期

【摘要】：研究添加不同含量Zn对铸态Mg-2Dy(摩尔分数,%)合金显微组织、时效行为和力学性能的影响。结果表明:Zn含量为0.5%和1%(摩尔分数)时,铸态合金中分别析出片层状具有18R类型长周期有序(LPSO)结构的Mg12Zn Dy相和粗大的Mg3Zn3Dy2相;同时,Zn的添加细化了合金的晶粒;固溶处理后,LPSO相由18R类型转变成沿晶内分布的细条状的14H类型,新的(Mg,Zn)x Dy相形成,且Mg3Zn3Dy2相的体积分数减小;添加0.5%Zn有效地增强了合金的时效硬化行为,提高了合金的室温和200℃的拉伸强度。
[Abstract]:The effects of Zn addition on the microstructure, aging behavior and mechanical properties of as-cast Mg-2Dyalloy were investigated. The results show that the Mg12Zn Dy phase and the coarse Mg3Zn3Dy2 phase with 18R type long-period ordered LPSO structure are found in the as-cast alloy with 0.5% Zn content and 1 mole fraction, respectively, and the grain size of the alloy is refined with the addition of Zn. After solid solution treatment, the LPSO phase changed from 18R type to thin stripe 14H type distributed along the crystal, the new phase formed and the volume fraction of Mg3Zn3Dy2 phase decreased, and the aging hardening behavior of the alloy was effectively enhanced by adding 0.5%Zn. The tensile strength of the alloy at room temperature and 200 鈩，

本文编号：1861506