Quantitative study of grain refinement in Al-Mg alloy processed by equal channel angular pressing at cryogenic temperature

被引：31

作者：

Chen, Y. J. ^{[1
]}

Roven, H. J. ^{[1
]}

Gireesh, S. S. ^{[1
]}

Skaret, P. C. ^{[1
]}

Hjelen, J. ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

来源：

MATERIALS LETTERS | 2011年 / 65卷 / 23-24期

关键词：

Al-Mg alloy; Electron backscattering diffraction (EBSD); Severe plastic deformation (SPD); Grain refinement; Microstructure; Grain boundaries; SEVERE PLASTIC-DEFORMATION; ALUMINUM-ALLOYS; HOT DEFORMATION; ECAP; MICROSTRUCTURE; EVOLUTION; SIZE;

D O I：

10.1016/j.matlet.2011.07.067

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Strain induced grain refinement of an Al-1 wt.% Mg alloy processed by equal channel angular pressing (ECAP) at cryogenic temperature is investigated quantitatively. The results show that both mean grain and subgrain sizes are reduced gradually with increasing ECAP pass. ECAP at cryogenic temperature increases the rate of grain refinement by promoting the fraction of high angle grain boundaries (HAGBs) and misorientation at each pass. The fraction of HAGBs and the misorientation of Al-1 wt.%Mg alloy during ECAP at cryogenic temperature increase continuously as a function of equivalent strain. Both {110} and {111} twins at ultrafine-grained size are observed firstly in Al-Mg alloy during ECAP. The analysis of grain boundaries and misorientation gradients demonstrates the grain refinement mechanism of continuous dynamic recrystallization. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：3472 / 3475

页数：4

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