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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 3    September 1999

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High strain rate superplasticity of SiC whisker reinforced pure aluminum composites
Xu Xiaojing(许晓静), Zhao Changzheng(赵昌正), Zhang Di(张 荻),Shi Zhongliang(施忠良), Wu Renjie(吴人洁)

State Key Laboratory of Metal Matrix Composites,ShanghaiJiaoTong University, Shanghai200030, P.R.China

Abstract:A β-SiC whisker reinforced pure aluminum composites expected to exhibit high strain rate superplasticity has been successfully fabricated by a new processing route consisting of pressure infiltration, extrusion with a low extrusion ratio and rolling. The composites exhibite a total elongation of 220%~380% in the initial strain rates within 1.0×10-2~1.0×10-1s-1 and at 893~903 K. According to differential thermal analysis(DTA) and microstructure observation, it is concluded that an appropriately small amount of liquid phase is necessary to cause a good high strain rate superplasticity in aluminum matrix composites in addition to fine and uniform microstructure.

 

Key words: high strain rate; superplasticity; aluminum matrix composites; pressure infiltration

ISSN 1672-7029
CN 43-1423/U

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