Microstructure of Al-Si-Mg alloy processed by rotary-die equal channel angular pressing

被引：38
|
作者：
Kim, JC [1 ]
Nishida, Y
Arima, H
Ando, T
机构：
[1] Korea Inst Machinery & Mat, Dept Mat Technol, Nanopowder Mat Grp, Chang Won 641010, Kyungnam, South Korea
[2] AIST, ISEM, Nagoya, Aichi 4628560, Japan
[3] Aichi Steel Co, Nagoya, Aichi, Japan
[4] Northeastern Univ, Boston, MA 02115 USA
来源：
MATERIALS LETTERS | 2003年 / 57卷 / 11期
关键词：
equal channel angular pressing (ECAP); severe plastic strain techniques; microstructure; ultrafine-grained materials; superplasticity;
D O I：
10.1016/S0167-577X(02)01053-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
New rotary-die ECAP (RD-ECAP) was applied to a commercial Al-Si-Mg (AC4C) alloy to improve the ductility, and the microstructural developments and mechanical properties of ECAPed specimens were investigated. The as-cast Al alloy was used after machining to a cylindrical shape. ECAP was performed at 543, 603 and 673 K. The microstructure changes of samples were examined. The Vickers microhardness was measured with respect to RD-ECAP passes and the tensile test was conducted to check the high-temperature ductility. The samples after ECAP showed very clean external surface without any edge cracking. The grain size was drastically decreased and saturated into 2-3 mum after six passes because the dynamic recovery occurred during the process. After 10 passes, a very homogenous microstructure was obtained. The longation of the alloy increased from 25% to 125% after 10 passes, and the m value was 0.21 after 20 passes. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：1689 / 1695
页数：7
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