AZ31镁合金粉末氢气氛下机械球磨的组织演变  

Microstructure Evolution of AZ31 Magnesium Alloy Powders Prepared by Mechanical Milling in Hydrogen Atmosphere

作　　者：王珩[1] 胡连喜[1] 陈先觉[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《材料工程》2008年第10期183-186,共4页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50574034);教育部博士点基金资助项目(20060213016)

摘　　要：在氖气氛下机械球磨AZ31镁合金粉末，利用机械力作用使镁合金粉末与氢气发生反应生成纳米晶MgH2，用x射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）等方法观察和分析了镁合金粉末与氢气在球磨过程中的微观组织演变。结果表明：球磨初始阶段粉末颗粒被碾压成扁平状，随着球磨的进行粉末颗粒逐渐细化，球磨至80h，形成粒度1～3μm、晶粒尺寸10nm左右的纳米晶MgH。粉末材料。AZ31 magnesium alloy powders were prepared by mechanical milling in a hydrogen atmosphere. Nanocrystalline MgH2 was created by the reaction of magnesium alloy powders and hydrogen attributed to the mechanical force. The microstructure evolution of the alloy during mechanical milling was characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）, respectively. The results showed that,during milling, the powders were at first rolled into flakes, and then, with the further increased of the milling time,the powders refined gradually. After milling for 80h, the nanocrystalline MgH2 powders, with grain size of about 10nm and particle size of 1-3μm in average respectively, were obtained.

关 键 词：AZ31镁合金粉末 机械球磨 纳米品材料 MgH2 微观组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]