Microstructural evolution of superplasticity in large-grained Ni-48Al intermetallics

被引：15

作者：

Hu, J

Lin, DL ^{[1
]}

机构：

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

[2] Jiangsu Polytech Univ, Dept Engn Mech, Changzhou 213016, Jiangsu, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 371卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

NiAl intermetallics; large grains; superplasticity; continuously dynamic recovery and recrystallization; high temperature deformation;

D O I：

10.1016/j.msea.2003.10.245

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Superplastic behavior has been found in large-grained Ni-48A] intermetallics with grain size of 200 mum. The large-grained Ni-48A] alloy exhibit deformation characteristics of most fine-grained superplastic alloys without the usual pre-requisites of a fine grain size and grain boundary sliding (GBS). Metallographic examination (OM) has shown that the average grain size of large-grained intermetallics decreases during superplastic deformation and a much finer grain size could be obtained after superplastic deformation. Transmission electron microscopy (TEM) and electron back-scattered diffraction (EBSD) observations have shown that there are great numbers of subgrain boundaries which form a network and among which the proportion of low and high angle boundaries increases with the increase of strain. The observed superplastic phenomenon is explained by continuously dynamic recovery and recrystallization (CDRR). During superplastic deformation, an unstable sub,rain network forms and these subboundaries absorb gliding dislocations and transform into low and high angle grain boundaries. A dislocation gliding and climbing process accommodated by subgrain boundary sliding, migration and rotation, enables the superplastic flow to proceed. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：113 / 118

页数：6

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