Hot deformation behavior of squeeze casting SiC_p/2A50 matrix composites

Abstract

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.

Keywords

SiC_p/2A50 matrix composites / deformation activation energy / stress and strain / dynamic recrystallization

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