AZ31镁合金粉末氢气氛下机械球磨的组织演变.pdf

AZ31镁合金粉末氢气氛下机械球磨的组织演变 183 AZ31镁合金粉末氢气氛下机械球磨的组织演变 MicrostructureEvolutionofAZ31 Powders MagnesiumAlloy Prepared Mechanicalin MillingHydrogen by Atmosphere 王珩，胡连喜，陈先觉 (哈尔滨工业大学材料科学与工程学院，哈尔滨150001) WANG Lian-xi．CHEN Heng。HU Xian-jue (SChooIofMaterialsScienceand Instituteof 150001，China) Engineering，HarbinTechnology，Harbin 摘要：在氢气氛下机械球磨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MgH：，用X 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 ～3肚m、晶粒尺寸10nm左右的纳米晶MgH：粉末材料。 关键词：AZ31镁合金粉末；机械球磨；纳米晶材料；MgH2I微观组织 中图分类号：TGl46．22文献标识码：A 文章编号：1001—4381(2008)10-0183—04 1 were mechanicalina atmos— Abstract：AZ3 magnesiumalloypowderspreparedby millinghydrogen wascreatedthereactionof and phere．NanocrystallineMgH2 by magnesiumalloypowdershydrogen attributedtothemechanicalforce．Themicrostructureevolutionofthe mechanical alloyduring milling wascharacterizedmeansof electron by X—raydiffraction(XRD)，scanning transmissionelectron resultsshowed microscopy(TEM)，respectively．Thethat，duringmilling，the wereatfirstrolledintoflakes，andthen，withthefurtherincreasedofthe time，the powders milling refined for80h，the size powders gradually．Aftermilling nanocrystallineMgH2powders，Withgrain ofabout10nman