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Xu H.,North University of China | Zhang X.,North University of China | Zhang X.,Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts | Zhang X.,Beijing North Vehicle Group Corporation | And 9 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2012

The flow stress behaviors of squeeze casting SiC p/2A50 matrix composites were investigated by means of compression tests on a Gleeble 1500 therma1 mechanical simulator at isothermal constant strain rates ranging from of 0.001 to 1.0 with the testing temperature ranging from 350 to 500°C. The experiments showed that the relationship between stress and strain was obviously influenced by the strain rate and temperature. Dynamic recrystallization generally occurred at a higher temperature and a 1ower strain rate. A linear equation could be fitted between the Zener-Hollomon parameter Z and stress in the experiments. The mean value reciprocal of temperature at every true strain had a linear relation with natural logarithm of Z parameter, and the correlation coefficient, R=0.99, which was very significant by examination. The hot deformation activation energy of SiC p/2A50 matrix composites was 163.47 KJ/mol by calculation. © 2012 Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.

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