锻压技术

侧向等径挤压过程中的材料组织演化规律

英文标题：Regularity of material structure evolution in equalchannel angular pressing

作者：汪建敏许晓静石凤健姜银方

单位：江苏大学材料科学与工程学院江苏大学材料科学与工程学院江苏科技大学材料科学与工程学院江苏大学材料科学与工程学院江苏镇江212013 江苏镇江212013 江苏镇江212001 江苏镇江212013

分类号：TG376

出版年,卷(期):页码：2005,30(2):41-43

摘要：

论述了采用侧向等径挤压简称(ECAE/ECAP)技术制备超细晶材料的基本原理和组织演化过程。试验采用紫铜棒作为试样,在室温下进行了多道次挤压,等径挤压后,原始晶粒中产生了大量位错缠结和位错胞,随着挤压道数的增加,由原来被拉长的显微组织逐渐变成等轴显微组织。挤压4道次后,变形织构消失,挤压6道次后,位错胞崩塌变成为亚晶或晶粒,之后,晶界会不断增厚以及晶粒旋转,使亚晶变成大角度均匀的等轴超细晶,其晶粒尺寸为500nm～1μm。

This paper describes the principle of equal channel angular pressing (ECAE/ECAP) to make ultra-fine grain structure material. The experiment takes the purity copper bar as the sample which are subjected to several pressings. After equal-channel angular pressings, there are a large number of dislocation twines and dislocation grains and with the consequent deformation developed, sub-grain bands will be become equiaxial grains. After four pressings, bandings of structure and texture are vanished and after that with the severe shearing function grain boundaries are continually thickened and revolved. So the homogeneous high angle boundaries ultra-fine grains which are about 500nm～1μm can be achieved.

基金项目：

参考文献：

[1]HuangWH,ChangL,KaoPW,ChangCP.Effectofdie angleondeformationtextureofcopperprocessedbyequalchannelangularextrusion[J].MaterialsScienceandEngi neeringA,2001,307(1-2):113118.
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