Development of grain structure during superplastic deformation of an Al-Zn-Mg-Cu-Zr alloy containing Sc

被引：46

作者：

Mukhopadhyay, A. K. ^{[1
]}

Kumar, A. ^{[1
]}

Raveendra, S. ^{[2
]}

Samajdar, I. ^{[2
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

[2] Indian Inst Technol, Bombay 400076, Maharashtra, India

来源：

SCRIPTA MATERIALIA | 2011年 / 64卷 / 05期

关键词：

Al-Zn-Mg-Cu-Zr-Sc alloy; Two-step strain rate; Superplasticity; Transmission electron microscopy; Electron backscattered diffraction; RECRYSTALLIZATION; ALUMINUM;

D O I：

10.1016/j.scriptamat.2010.10.038

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Recent studies have shown that a suitably thermomechanically processed Al-Zn-Mg-Cu-Zr-Sc alloy having an essentially unrecrystallized grain structure may be subjected to superplastic deformation at a temperature and strain rate combination of 475 degrees C, 1.9 x 10(-2) s(-1) to obtain a total elongation of 650%. The present work demonstrates that the utilization of two-step strain rate at 425 degrees C during superplastic deformation of a similarly thermomechanically processed alloy increases the total elongation value to as high as 916%. The beneficial effect of two-step strain rate could further be realized at 350 degrees C to obtain a total elongation of 438%. Using electron backscattered diffraction, the present work provides a systematic assessment of the changes in (i) percentage recrystallization and (ii) recrystallized grain size with percentage elongation in the material superplastically deformed using both one- and two-step strain rates. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：386 / 389

页数：4

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