Enhanced ductility and deformation mechanisms of ultrafine-grained Al-Mg-Si alloy in sheet form at warm temperatures

被引：14
|
作者：
Kim, W. J. [1 ]
Yoo, S. J. [1 ]
机构：
[1] Hongik Univ, Dept Mat Sci & Engn, Seoul 121791, South Korea
来源：
SCRIPTA MATERIALIA | 2009年 / 61卷 / 02期
关键词：
Severe plastic deformation; Aluminum alloys; Ductility; Ultrafine-grained microstructure; ALUMINUM-ALLOY; SUPERPLASTICITY;
D O I：
10.1016/j.scriptamat.2009.03.037
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ultrafine-grained Al-Mg-Si alloy processed by high-ratio differential speed rolling exhibited significantly enhanced tensile ductility at warm temperatures (493-553 K). The dominant deformation mechanism of the alloy was found to be pipe-diffusion-controlled grain boundary sliding associated with a stress exponent of 4. According to the analyses based on Hart's necking criterion, in addition to increased strain rate sensitivity, increased strain hardening by accelerated dynamic grain growth notably contributes to the ductility of ultrafine-grained aluminum. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：125 / 128
页数：4
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