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Development of ultrafine-grained microstructure and low temperature (0.48 Tm) superplasticity in friction stir processed Al-Mg-Zr

被引：106
作者：
Ma, ZY
Mishra, RS
机构：
[1] Univ Missouri, Ctr Frict Stir Proc, Rolla, MO 65409 USA
[2] Univ Missouri, Dept Mat Sci & Engn, Rolla, MO 65409 USA
[3] Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China
来源：
SCRIPTA MATERIALIA | 2005年 / 53卷 / 01期
基金：
美国国家科学基金会;
关键词：
low temperature superplasticity; friction stir processing; aluminum alloy; ultrafine grains;
D O I：
10.1016/j.scriptamat.2005.03.018
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 [材料科学与工程]; 080502 [材料学];
摘要：
Friction stir processing (FSP) was applied to extruded Al-4Mg-1Zr to produce fine-grained microstructure with grains sized 0.7-1.6 mu m. Low temperature deformation behavior was investigated at 175 degrees C and initial strain rates of 5 x 10(-5)-3 x 10(-3) s(-1). Low temperature superplasticity was observed in ultrafine-grained material. A maximum superplastic elongation of 240 % was obtained in ultrafine-grained (0.7 mu m) ESP sample at an initial strain rate of 1 X 10(-4) s(-1) where a maximum strain rate sensitivity of 0.34 was observed. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：75 / 80
页数：6
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