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

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 2    April 2008

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Flow stress and microstructure evolution of semi-continuous casting AZ70 Mg-alloy during hot compression deformation
GUAN Shao-kang(关绍康), WU Li-hong(吴立鸿), WANG Li-guo(王利国)

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China

Abstract:To evaluate and predict flow stress and set up hot forging process of AZ70 magnesium alloy, hot compression tests of AZ70 magnesium alloy were carried out on Gleeble 1500D thermo-mechanics tester at 300−420 ℃ and strain rates of 0.001−1 s−1 with different compression degrees. It is indicated that temperature and strain rate are the main factor affecting the flow stress and microstructure. Stress increases but average grain size decreases with temperature decreasing and strain rate increasing. The stress model, constituted by introducing temperature-compensated strain rate, the Zener-Hollomon parameter, has a good fitness with the proof stress value under the experimental condition. The reciprocal of grain size at true strain of 1.0 has a linear relation with natural logarithm of Z parameter, and the correlation coefficient, R=0.95, is very significant by examination. The hot deformation activation energy Q of AZ70 alloy is 166.197 kJ/mol by calculation.


Key words: AZ70 Mg-alloy; flow stress; Zener-Hollomon parameter; microstructure evolution

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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