高能球磨金属铬、铝粉末的特征

利用金属铬及铝粉末进行高能机械球磨，分析、研究了这些粉要的组织与相结构的变化。随着球磨时间的延续，脆性铬粉末由于冷焊与破碎相互作用的结果而使其平均粒度不断减小，衍射峰发生宽化及峰高降低现象；而韧性铝粉末则表现出强烈的冷焊性，使绝大多数粉末都粘附于磨球表面及罐壁，同时在剧烈变形的铝粉末微观组织中发现有许多位错环，而无位错缠结。

Characteristics of Cr and Al Powders by High Energy Ball Milling

The variation of microstucture and phase structure of metal Cr and Al powders prepared by high energy mechanical milling was analyzed and investigated.The results show that with the continuous balling the average grain sizes of the brittle Cr powders are gradually decreased,and the diffraction peaks are widened and the peak values lower owing to the interrelation caused by both cold welding and breaking;the tough Al powders exhibit intense cold welding,and most of powders lead to adhesion to ball surface and pot wall,meanwhile,the Al powders subjected to intense deformation have led to many dislocation rings with non dislocation wind up found in the microstructure.