Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

被引：67

作者：

An, Xianghai ^{[1
]}

Lin, Qingyun ^{[1
]}

Qu, Shen ^{[1
]}

Yang, Gang ^{[2
]}

Wu, Shiding ^{[1
]}

Zhang, Zhe-Feng ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[2] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH | 2009年 / 24卷 / 12期

基金：

中国国家自然科学基金;

关键词：

MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; MICROSTRUCTURAL EVOLUTION; PLASTIC-DEFORMATION; NANOSTRUCTURED MATERIALS; STAINLESS-STEEL; COPPER; ORIENTATION; TEMPERATURE;

D O I：

10.1557/JMR.2009.0426

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

X-ray diffraction (XRD) and transmission electron microscope (TEM) investigations have been carried out to decode the influence of stacking-fault energy (SFE) on the accommodation of large shear deformation in Cu-Al alloys subjected to one-pass equal-channel angular pressing. XRD results exhibit that the microstrain and density of dislocations initially increased with the reduction in the SFE, whereas they sharply decreased with a further decrease in SFE. By systematic TEM observations, we noticed that the accommodation mechanism of intense shear strain was gradually transformed from dislocation slip to deformation twin when SFE was lowered. Meanwhile, twin intersections and internal twins were also observed in the Cu-Al alloy with extremely low SFE. Due to the large external plastic deformation, microscale shear bands, as an inherent deformation mechanism, are increasingly significant to help carry the high local plasticity because low SFE facilitates the formation of shear bands.

引用

页码：3636 / 3646

页数：11

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