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. 20    Special 2    July 2010

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Effects of strain rate and temperature on microstructure and
texture for AZ31 during uniaxial compression
XIN Ren-long(辛仁龙)1, 2, WANG Bing-shu(汪炳叔)1, ZHOU Zheng(周 正)1,
HUANG Guang-jie(黄光杰)1, 2, LIU Qing(刘 庆)1, 2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China

Abstract:In order to investigate the effects of strain rate and temperature on the microstructure and texture evolution during warm deformation of wrought Mg alloy, AZ31 extruded rods were cut into cylinder samples with the dimension of d8 mm×12 mm. The samples were compressed using a Gleeble 1500D thermo-mechanical simulation machine at various strain rates (0.001, 0.01, 0.1, 1 and 5 s−1) and various temperatures (300, 350, 400 and 450 ˚C). The microstructure and texture of the compressed samples at the same strain under different deformation conditions were studied and compared by electron backscatter diffraction (EBSD) in scanning electron microscope (SEM). The results show that the size of recrystallized grains in the deformed samples generally increases with the decrease of strain rate and the increase of temperature. After 50% reduction, most basal planes are aligned perpendicular to the compression direction at relatively high strain rate (>0.01 s−1) or low temperature (<350 ˚C). The optimized strain rate is 0.1 s−1 for uniaxial compression at 300 ˚C, which produces about 80% of small grains (<5 μm).

 

Key words: magnesium alloy; electron backscatter diffraction; dynamic recrystallization; microstructure; texture

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

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

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