Superplasticity of Ni-rich single phase NiAl intermetallics with large grains

被引：20

作者：

Lin, DL ^{[1
]}

Hu, J

Jiang, DM

机构：

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

[2] Jiangsu Polytech Univ, Dept Mat Sci & Engn, Changzhou 213016, Jiangsu, Peoples R China

来源：

INTERMETALLICS | 2005年 / 13卷 / 3-4期

关键词：

nickel aluminides; based on NiAl; superplasticitc behaviour; plastic deformation mechanisms; grain-boundary character distribution;

D O I：

10.1016/j.intermet.2004.07.008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Superplastic behavior has been found in Ni-rich single phase NiAl intermetallics with large grains. The large-grained NiAl alloy exhibited deformation characteristics of most fine-grained superplastic alloys without the Usual pre-requisites of a fine grain size and grain boundary sliding. Metallographic examination (OM) showed that the average grain size of large-grained NiAl alloys decreased during superplastic deformation and a much finer grain size was obtained after superplastic deformation. Transmission electron microscopy (TEM) and electron back-scattered diffraction (EBSD) observations showed that there were great numbers of subgrain boundaries which formed a network and among which the proportion of low and high angle boundaries increased with the increase of strain. The maximum elongation to fracture increases with the increase of Ni content in Ni-rich single phase NiAl intermetallics. The observed superplastic phenomenon is explained by continuous dynamic recovery and recrystallization. (c) 2004 Elsevier Ltd. All rights reserved.

引用

页码：343 / 349

页数：7

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