Superplastic extensibility deformation of Al-3%Mn alloy with submicrometer grain size  

亚微米晶Al-3%Mn合金的超塑延展性变形行为(英文)

作　　者：肖旋[1] 高慈[1,2] 侯介山[2] 郭建亭[2] 

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159 [2]中国科学院金属研究所,沈阳110016

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第5期1035-1040,共6页中国有色金属学报（英文版）

摘　　要：Submicrometer-grained （SMG） Al-3%Mn （mass fraction） alloy specimens with initial grain size of -0.3 μm were produced by ball milling for 3 h. The Al-3%Mn specimens which were cold rolled with a strain rate of 1×10^-3- 1×10^-2 s-1 at room temperature show high extensibility to failure more than 2500%. Microstructures of pure Al and Al-3%Mn alloy at as-milled and cold-rolled state were examined using X-ray diffraction and transmission electron microscopy （TEM）. Based on the microstructure analysis, it is established that the mechanism of the continued plastic deformation in SMG Al-3%Mn alloy consists of dislocation slip, grain boundary sliding companied by dynamic recovery and recrystallization, and dynamic recrystallization is a main control factor of the large plastic deformation.采用球磨法制备晶粒尺寸为0.3μm的亚微米晶Al-3%Mn(质量分数)合金。Al-3%Mn合金在室温下轧制时,表现为极高的延展性(超过2500%)。采用透射电镜(TEM)观察球磨态和冷轧态的纯铝和Al-3%Mn合金组织;采用X射线衍射对比分析组成,发现连续塑性变形机制包括位错滑移和晶界滑动,同时还有动态回复和再结晶,而动态再结晶是大塑性变形的主要控制机制。

关 键 词：aluminium alloys mechanical alloying cold rolling deformation structure 

分 类 号：TG146.21[一般工业技术—材料科学与工程]