喷射沉积Mg-9Al-4.5Ca合金的显微组织和力学性能研究  

Microstructure and mechanical properties of spray deposited Mg-9Al-4.5Ca alloy

作　　者：王震东[1] 陈伟[1] 王有祁[1] 马力[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《兵器材料科学与工程》2009年第2期96-99,共4页Ordnance Material Science and Engineering

摘　　要：通过金相显微镜、X射线衍射仪、扫描电镜、拉伸试验机对喷射沉积工艺制备的Mg-9Al-4.5Ca锭坯沉积态和挤压态的显微组织、相组成与力学性能进行研究。结果表明:喷射沉积Mg-9Al-4.5Ca合金的组织较常规铸态细小,经热挤压加工后组织进一步细化,沉积态合金的组织为等轴晶,晶粒度为3～5μm;沉积坯的相组成为α-Mg、Al2Ca、Mg2Ca、Ca2Mg6Zn3和MgZn2,经热挤压后相组成转变为α-Mg、Al2Ca、Mg2Ca、Mg17Al12和MgZn2;合金挤压态的力学性能较常规变形镁合金MB7有显著提高,抗拉强度、屈服强度、延伸率分别为470MPa、390MPa、8%。合金的强化机制主要为细晶强化,固溶强化和弥散强化。Mg-9Al-4.5Ca billets were prepared by spray deposition. Microstructures and mechanical properties of the deposited and extruded billets were studied by means of optical microscop(OM),X-ray diffraction (XRD),scanning electronic microscopy (SEM) and measurement of tensile properties. The results show that the structure of spray deposited Mg-9Al-4.5Ca alloy is much smaller than that of cast alloy, the microstructures are 3-5 μm equiaxed grains in deposited alloy and can be further refined after hot extruding. ...

关 键 词：镁合金 MG-AL-CA 喷射沉积 快速凝固 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]