Superplasticity of single-phase Ni-48Al intermetallics with large grains

被引：15

作者：

Hu, J

Lin, DL ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Open Lab High Temp Mat & Tests, Educ Minist China, Shanghai 200030, Peoples R China

[2] Jiangsu Inst Technol, Dept Mech Engn, Changzhou 213016, Jiangsu, Peoples R China

来源：

MATERIALS LETTERS | 2004年 / 58卷 / 7-8期

基金：

中国国家自然科学基金;

关键词：

binary NiAl intermetallics; large-grained; superplasticity; continuously dynamic recovery and recrystallization; high temperature deformation;

D O I：

10.1016/j.matlet.2003.04.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Superplasticity was found in single-phase Ni-48Al alloy with initial grain size of 200 gm under an initial strain rate of 1.25 x 10(-4) to 2 x 10(-3) s(-1) at temperatures ranging from 1025 to 1100 degreesC. The maximum elongation of 188.2% was obtained under an initial strain rate of 1.125 x 10(-3) s(-1) at 1100 degreesC. Optical metallography (OM) showed that the grains were refined during superplastic deformation from initial 200 to less than 20 gm. Transmission electron microcopy (TEM) observation showed that an unstable subgrain boundary network formed during superplastic deformation. The subgrain boundaries were transformed into low- and high-angle grain boundaries by absorbing gliding dislocations. The large-grained superplastic phenomenon could be explained by continuously dynamic recovery and recrystallization (CDRR). (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1297 / 1301

页数：5