机械球磨对烧结形成Mg_2Ni相的影响  

Effect of ball milling on the formation of Mg_2Ni phase in sintering

作　　者：王仲民[1] 周怀营[1] 成钢[1] 顾正飞[1] 朱敏[2] 

机构地区：[1]桂林电子工业学院材料科学与工程中心,桂林541004 [2]华南理工大学纳米功能材料研究室,广州510640

出　　处：《粉末冶金技术》2005年第1期48-51,共4页Powder Metallurgy Technology

基　　金：国家自然科学基金资助项目 (5 0 1710 2 4 );广西自治区自然科学基金资助项目 (0 135 0 5 3)

摘　　要：本文分析了球磨处理对烧结时Mg2 Ni相形成的影响。试验结果表明 ,球磨处理后的Mg、Ni混合粉晶粒细化 ,并形成了有利于原子扩散的微结构 (如界面密度、晶格缺陷密度增加等 ) ,从而使烧结时Mg2 Ni相更易形成。X衍射和DSC分析也证实 ,烧结形成Mg2 Ni相的过程中无中间相的产生 ,适当的球磨处理会影响Mg2 Ni相形成的温度和焓变 (ΔH) ,可使Mg2 Ni相形成在较低温度范围 (770K左右 )下进行。The effect of ball milling on the formation of Mg2Ni in sintering was discussed in this paper. It was found that the particles of mixed powder of Mg and Ni were fragmented, the grain size of Mg and Ni greatly decreased and the density of Mg/Ni interface increased by ball milling, which enhanced the solid-diffusion reaction in sintering and resulted in the increasing of the ratio of Mg2Ni formed. XRD and DSC analysis also showed that no new phase was produced during the formation of Mg2Ni in sintering, and the formation of Mg2Ni phase can be finished at lower temperature (770 K or so) by means of the change of the forming temperature of Mg2Ni phase and its enthalpy of transition caused by a suitable ball milling.

关 键 词：MG2NI 晶粒细化 机械球磨 原子扩散 焓变 微结构 温度范围 烧结 混合粉 晶格缺陷 

分 类 号：TF046[冶金工程—冶金物理化学] TG139.7[一般工业技术—材料科学与工程]