Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 18    No. 4    August 2008

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Relationship between boundary misorientation angle and true strain during high temperature deformation of 7050 aluminum alloy
HU Hui-e(胡会娥)1, YANG Li(杨 丽)1, ZHEN Liang(甄 良)1,
SHAO Wen-zhu(邵文柱)1, ZHANG Bao-you(张宝友)1

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:Tensile tests of solid solution treated 7050 aluminum alloy were conducted to different strain degrees (0.1, 0.4, 0.6 and failure) at 460 ℃ with the strain rate of 1.0×10−4−1.0×10−1s−1. The boundary misorientation angle evolution during hot deformation of the 7050 aluminum alloy was studied by EBSD technique and the fracture surfaces were observed using SEM. A linear relationship between the increase in the average boundary misorientation angle and the true strain at different strain rates is assumed when aluminum alloy is deformed at 460 ℃. The increasing rate of average boundary misorientation angle is 15.1˚, 15.7˚ and −0.75˚ corresponding to the strain rate of 1.0×10−4, 1.0×10−2 and 0.1 s−1, respectively. The main softening mechanism is continuous dynamic recrystallization when the strain rates are 1.0×10−4 and 1.0×10−2 s−1, and it is dynamic recovery when strain rate is 0.1 s−1.

 

Key words: boundary misorientation angle; aluminum alloy; electron backscatter diffraction(EBSD); high temperature deformation; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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