金属铝纳米晶块体材料的制备与性能表征  

Preparation and Properties Characterization of Nanocrystalline Al

作　　者：于成伟[1] 宋晓艳[1] 卢年端[1] 李尔东[1] 

机构地区：[1]北京工业大学材料学院/新型功能材料教育部重点实验室,北京100124

出　　处：《材料工程》2008年第10期251-253,256,共4页Journal of Materials Engineering

基　　金：国家自然科学基金(50671001);教育部新世纪优秀人才项目(NCET2006);教育部博士点基金(20070005010)

摘　　要：在惰性气体保护的全封闭系统内,采用直流氢电弧蒸发-冷凝与放电等离子烧结相结合的技术制备出高致密度、晶粒尺寸细小且分布均匀的纯铝纳米晶块体材料。对制备材料的结构分析表明,铝纳米晶块体具有很高的纯度,纳米晶界面洁净无杂相。对制备的铝纳米晶块体的力学性能测试表明,其显微硬度为2.12GPa,比铝粗晶材料提高了约6倍;而弹性模量与粗晶块体相比变化不大。Pure Al nanocrystalline bulk with high relative density, small grain size and homogeneous grain size distribution was prepared by combing the hydrogen-arc condensation and spark plasma sintering in an entirely closed system filled with the inert gas. It shows that in the A1 nanocrystalline bulk structure, the nanograin boundaries are clean without any other phases. The measured mechanical properties of the AI nanocrystalline bulk show that the micro hardness has a value of 2.12GPa, which is about 6 times higher than that of the polyerystalline bulk, while the elastic modulus increases only a little as compared with the polycrystalline bulk.

关 键 词：纳米晶块体 放电等离子烧结 显微硬度 弹性模量 

分 类 号：TF12[冶金工程—粉末冶金]