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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 5    October 2001

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Mechanical behavior of LC4 alloy in semisolid
state at high volume fractions of solid
TIAN Wen-tong(田文彤), LUO Shou-jing(罗守靖), ZHANG Guang-an(张广安)

School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001, P.R.China

Abstract: The mechanical behavior of LC4 alloy in the semisolid state at high volume fractions of solid has been studied through unconstrictive compressing test.  The results show that peak stress mainly depends on grain boundary's cohesion and instantaneous strain rate sensitivity in the semisolid state, which is similar to that in the solid state. Analyses on microstructures and status of compressive stress of specimen demonstrate that segregation of liquid-solid phase is mainly affected by strain rate and deformation temperature.  There are mainly two kinds of flow in liquid phase: either from the region with relatively large hydrostatic compressive stress to the region with relatively small hydrostatic compressive stress or from the grain boundaries perpendicular to the compression axis to the grain boundaries with a certain directional angle to the compression direction. Based on the above results, compressive deformation mechanism mainly depends on deformation temperature, strain rate and stress state.

 

Key words:  LC4 alloy; semisolid; mechanical behavior; segregation of liquid-solid phase

ISSN 1672-7029
CN 43-1423/U

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