普通铸造Mg-25Zn-12Ho镁合金的微观组织研究  

Investigation on Microstructure of As-cast Mg-25Zn-12Ho Magnesium Alloy

作　　者：万晓峰[1] 曹露露[1] 李志扬[1] 张福豹[1] 黄明宇[1] 倪红军[1] WAN Xiaoibng;CAO Lulu;LI Zhiyang;ZHANG Fubao;HUANG Mingyu;NI Hongjun(College of Mechanical Engineering, Nantong University, Nantong 226019, China)

机构地区：[1]南通大学机械工程学院

出　　处：《热加工工艺》2018年第10期54-56,61,共4页Hot Working Technology

基　　金：江苏高校优势学科建设工程资助项目(2014年);江苏省自然科学基金(BK20130391);南通市科技计划项目(BK2014037)

摘　　要：通过光学显微镜、X射线衍射仪、差示扫描量热分析仪、扫描电镜和透射电镜研究了Mg-25Zn-12Ho铸态合金的微观组织。结果表明：试验合金铸态微观组织主要由三种不同类型的中间相构成,分别为骨骼块状二十面体准晶I相、片层状W相以及致密片状Mg7Zn3相。骨骼状准晶I成分为Mg、Zn和Ho,经液相和W相的包晶反应形成于447℃左右。The microstructure of as-cast Mg-25 Zn-12 Ho alloy was investigated by optical microscopy, X-ray diffraction,differential scanning calorimeter, scanning electron microscopy and transmission electron microscope. The results indicate that as-cast Mg-25 Zn-12 Ho alloy are mainly composed of three types of phases, such as block icosahedral quas-icrystalline I phase, lamellar W phase and dense lamellar Mg_7Zn_3 phase. The composition of I-phase in the alloy is Mg, Zn, and Ho, which forms at about 447 ℃ by peritectic reaction between liquid phase and W phase.

关 键 词：Mg-Zn-Ho镁合金 微观组织 准晶相 

分 类 号：TG146.22[一般工业技术—材料科学与工程]