Study on fracture behavior of SiCp/A356 composites

稀有金属（英文版）, 2006, 25(z2): 168-173.

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1.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

2.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

3.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

4.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

5.Department of Materials Engineering, Korean Institute of Machinery & Materials, Gyeongnam 641831, Korea

基金项目: 国家高技术研究发展计划(863计划)(2003AA331190)

Study on fracture behavior of SiCp/A356 composites

Keywords： SiCp/A356 composites

The fracture behavior of SiCp/A356 composite at room and high temperatures was studied.Under tensile stress condition at room temperature, the fracture is mostly a combination of the brittle fracture of SiC particles and ductile fracture of A356 matrix.As the tensile temperature increases, the composite changes the main fracture behavior to the separation fracture of the bonding surface between SiC particles and A356 matrix.When the tensile temperature reaches 573 K, the fracture behavior of the composites is almost the whole separation fracture of the bonding surface, which is the main strengthening mechanism at high temperature.Under the cycle stress condition at room and high temperatures, the main fracture behavior of the composites is always a combination of the brittle fracture of SiC particles and ductile fracture of A356 matrix.However, under the cycle stress at high temperature, cycle behavior of the composites changes from cycle hardening at room temperature to the cycle softening at high temperature.

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Study on fracture behavior of SiCp/A356 composites

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