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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Microstructure and mechanical properties of Al-Fe-V-Si/SiCp composites
CHEN Zhen-hua(陈振华), HE Yi-qiang(贺毅强), YAN Hong-ge(严红革),
HAO Liang(郝  亮), CHEN Zhi-gang(陈志钢), CHEN Gang(陈  刚)

College of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:The characteristics of microstructures and mechanical properties of the multi-layer spray deposited SiCP/Al-6.5Fe-0.6V-1.3Si, SiCP/Al-8.5Fe-1.3V-1.7Si and SiCP/Al-10Fe-1.3V-2Si composite sheets obtained by rolling after extruding were investigated. The evolution of the grain and phases of these composites during processing were examined, and the influence of the microstructures on the mechanical properties was analyzed. The experimental results show that the ultimate tensile strengths σb of the three kinds of composite sheets are 420, 535, 470 MPa respectively at room temperature, and 232, 285, 300 MPa at 315 ℃ and 148, 180, 200 MPa at 400 ℃. The excellent mechanical properties can be attributed to the high solid solubility, fine grain size, Al12(Fe,V)3Si precipitation particles and the SiC particles. And the composition of the matrix alloy has an obvious effect on the mechanical properties of the as-rolled sheets.

 

Key words: heat resistant alloy; composite; spray deposition; microstructure; mechanical property

ISSN 1672-7029
CN 43-1423/U

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