Fabrication of bulk ultrafine-grained materials through intense plastic straining

被引:130
作者
Berbon, PB [1 ]
Tsenev, NK
Valiev, RZ
Furukawa, M
Horita, Z
Nemoto, M
Langdon, TG
机构
[1] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
[2] Univ So Calif, Dept Mech Engn, Los Angeles, CA 90089 USA
[3] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia
[4] Fukuoka Univ Educ, Dept Technol, Fukuoka 81141, Japan
[5] Kyushu Univ, Dept Mat Sci & Engn, Fukuoka 81281, Japan
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1998年 / 29卷 / 09期
基金
美国国家科学基金会;
关键词
D O I
10.1007/s11661-998-0101-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ultrafine grain sizes were introduced into samples of an Al-3 pet Mg solid solution alloy and a cast Al-Mg-Li-Zr alloy using the process of equal-channel angular (ECA) pressing. The Al-3 pet Mg alloy exhibited a grain size of similar to 0.23 mu m after pressing at room temperature to a strain of similar to 4, but there was significant grain growth when the pressed material was heated to temperatures above similar to 450 K. The Al-Mg-Li-Zr alloy exhibited a grain size of similar to 1.2 mu m, and the microstructure was heterogeneous after pressing to a strain of similar to 4 at 673 K and homogeneous after pressing to a strain of similar to 8 at 673 K with an additional strain of similar to 4 at 473 K. The heterogeneous material exhibited superplastic-like flow, but the homogeneous material exhibited high-strain-rate superplasticity with an elongation of >1000 pet at 623 K at a strain rate of 10(-2) s(-1). It is concluded that a homogeneous microstructure is required, and therefore a high pressing strain, in order to: attain high-strain-rate superplasticity (HSR SP) in ultrafine-grained materials.
引用
收藏
页码:2237 / 2243
页数:7
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