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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Mechanical behaviour of Al/Al2O3 composite in pseudo-semi-solid state during isothermal compression
CHENG Yuan-sheng(程远胜), LUO Shou-jing(罗守靖)

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

Abstract:To gain a better understanding of thixoforging for the Al2O3-37%Al composite, its mechanical behavior in the pseudo-semi-solid state was studied by isothermal compression tests. The results show that the values of peak stress obviously decrease with increasing temperature and decreasing strain rate. The compressive true stress—strain curves of the Al2O3-37%Al composite can be divided into four stages. They are rapidly ascending, decreasing, steady and slowly ascending. Moreover, the main deformation mechanism controlling deformation of the composite in the pseudo-semi-solid state is the sliding or rotary movement between solid particles.

 

Key words: composite; pseudo-semi-solid state; mechanical behaviour; stress—strain curve

ISSN 1672-7029
CN 43-1423/U

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