稀土Nd对Mg-10Ho-0．6Zr合金铸态组织及时效特性的影响  

Effects of Nd on the Microstructure and Aging Properties of Mg--10Ho--0.6Zr Alloy

作　　者：栾军[1] 张志[2] 

机构地区：[1]吉林省冶金研究院,吉林长春130012 [2]河南理工大学材料科学与工程学院,河南焦作454003

出　　处：《中国材料科技与设备》2013年第2期42-44,共3页Chinese Materials Science Technology & Equipment

摘　　要：采用金相显微分析、X射线衍射、扫描电镜以及显微硬度测试等方法，研究了稀土元素Nd对Mg-3Zn-0．6Zr合金显微组织及时效特性的影响。研究发现Mg—Ho—xNd-0．6Zr（x=0、1、3、5wt．％）合金铸态光学组织主要由α-Mg固溶体，MgsRE相组成。Mg5RE相的含量随着Nd含量的增加而增加。当Nd含量为5wt．％时，有少量MgtzRE5相析出。时效处理后，Mg5RE相以及Mg41RE相都明显减少。Mg—Ho—5Nd—0．6Zr合金时效硬化效果最为明显，峰值硬度由铸态的104Hv增加到时效后的136Hv。The effects of Nd on the microstrueture and aging properties of the as--cast Mg--10Ho--0. 6Zr alloys were investigated by OM, XRD, SEM and hardness testing. The results show that Mg--Ho--xNd--0. 6Zr alloys are mainly composed of α--Mg matrix and Mg5 RE phase. The Mg5 RE phase is increased with increasing Nd content while decreased after heat treatment. Furthermore, the Mg41RE5 phase is only observed in Mg--10Ho--SNd--0. 6Zr alloy and decreased after heat treatment. The Mg--10Ho--5Nd--0. 6Zr alloy exhibit remarkable age hardening response and excellent mechanical properties. The hardness value of this alloy was increased from 104 for as--cast state to 136 for peak--aged state.

关 键 词：镁合金 钕 显微组织 时效 

分 类 号：TG146.22[一般工业技术—材料科学与工程]