摘要
采用低温球磨的方法制备了纳米晶纯铝粉体。利用电感耦合等离子体原子发射光谱法(ICP)、扫描电镜(SEM)和透射电镜(TEM)对经低温球磨前后的纯铝粉体的化学成分、颗粒形貌及尺寸、微观组织进行研究。结果表明,随着球磨时间的增加,纯铝粉体的颗粒尺寸分布呈现出"宽-窄-宽"式演化规律,这与存在于整个球磨过程中的"破碎-焊合"综合作用密切相关。低温球磨早期,位错胞演化机理主导纯铝粉体的晶粒细化;低温球磨后期,断裂冷焊机理则为纯铝粉体晶粒细化的主要机制。
Nanocrystalline aluminum powders was prepared by cryomilling.The chemical composition,morphology and particle size,microstructure of the aluminum powders before and after cryomilling were studied by inductive coupled plasma atom emission spectrometry（ICP）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM） respectively.The results indicate that the distribution of the particle size of aluminum powder changes from broadening to narrowing,and to broadening again with the increase of the milling time,which is concerned with comprehensive effects of the comminution and welding.The mechanism of evolution of dislocation cells dominates the grain refinement of the aluminum powder in the initial cryomilling period,while in the later cryomilling period the grain refinement of the aluminum powder is in the charged of the mechanism of fracture and cold welding.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2012年第2期38-42,共5页
Journal of Aeronautical Materials
关键词
纳米晶
纯铝
粉体
低温球磨
微观组织
nanocrystalline
aluminum
powders
cryomilling
microstructure
