WHAT IS IN A STRAIN HARDENING "PLATEAU"?

被引：0

作者：

Agnew, Sean R. ^{[1
]}

Calhoun, Christopher A. ^{[1
]}

Bhattacharyya, Jishnu J. ^{[1
]}

机构：

[1] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

来源：

MAGNESIUM TECHNOLOGY 2016 | 2016年

关键词：

Twinning; strain localization; EBSD; MAGNESIUM ALLOY; GRAIN-SIZE; DEFORMATION; BEHAVIOR;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A yield plateau occurs in some Mg alloys during compressive deformation that has been ascribed to the localization of twinning. In fine-grained AZ31, this plateau was explained by a region of large twin volume fraction nucleating in a small band and propagating, similar to a "Luders band" like phenomena. Once the band traverses the entire gauge length, the sample begins to strain harden. Similarly, ZK60 samples exhibit the same Luders like phenomena during extrusion direction compression as confirmed by digital image correlation. However, the hand is not sufficient to fully explain the plateau in the stress-strain curve. Postmortem electron backscattered diffraction (EBSD) reveals the twin structure evolution through this plateau. It is found that twinning occurs in large elongated grains before spreading to the finer grains.

引用

页码：189 / 194

页数：6

共 18 条

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