An electron back-scattered diffraction study on the microstructural evolution in large-grained iron aluminides during superplastic deformation

被引：7

作者：

Lin, DL ^{[1
]}

Liu, Y ^{[1
]}

机构：

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2002年 / 329卷

基金：

中国国家自然科学基金;

关键词：

iron aluminides; superplastic deformation mechanisms; grain boundary character distribution; electron back-scattered diffraction;

D O I：

10.1016/S0921-5093(01)01643-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microstructures in large-grained Fe3Al and FeAl alloys after superplastic deformation at 850 degreesC with a strain rate of 1.25 x 10(-3) s(-1) and at 1000 degreesC with a strain rate of 2.08 x 10(-2) s(-1), respectively, have been studied. Scanning electron microscope-electron channeling contrast observations indicate that the initial large grains were refined from about 50 to 100 Pm to about 10-20 mum in Fe3Al alloy and from above 350 mum to about 20-30 mum after deformation in FeAl alloy. Electron back-scattered diffraction analysis revealed that the density of sub-grain boundaries and low angle grain boundaries increased with the elongation in both alloys, clearly indicating that dislocation sliding and climbing are important processes during deformation, and this is supported by transmission electron microscopy observations. The experimental results support our previous model of continuous recovery and recrystallization for the mechanism of superplastic deformation in large-grained iron aluminides. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：863 / 871

页数：9

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