Microstructure and high strain rate superplasticity of in situ composite synthesised from aluminium and nanoZrO₂ particles by powder metallurgy

Authors: Geng, L.¹; Imai, T.²; Mao, J.F.¹; Takagi, M.³; Yao, C.K.¹

Source: Materials Science and Technology, Volume 17, Number 2, February 2001 , pp. 187-194(8)

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Abstract:

Pure aluminium matrix composites reinforced mainly with a fine needlelike Al₃Zr phase were synthesised by the reaction between nanocrystalline ZrO₂ particles and pure aluminium using powder metallurgy followed by hot extrusion and hot rolling. After extrusion, the composite fabricated with 5 vol.-%ZrO₂ had a strain rate sensitivity (m value) of 0.31 and a total elongation of 156% at 650°C and 1.3×10^-1 s^-1. The high strain rate superplasticity was improved by hot rolling. After hot rolling, the m value of the composite fabricated with 10%ZrO₂ particles was 0.40 and the total elongation was 204% at 640°C and 1.3×10^-1 s^-1. The superplastic deformation mechanism for the present composites involves grain boundary sliding and interfacial sliding. From this mechanism, the following experimental results can be easily understood: the total elongation increased with temperature, and the strain rate at which maximum total elongation was attained increased with increasing deformation temperature.

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1179/026708301101509845

Affiliations: 1: School of Materials Science and Engineering, Harbin Institute of Technology, PO Box 433, Harbin 150001, China 2: National Industrial Research Institute of Nagoya, Nagoya 462, Japan 3: Aichi Institute of Technology, Yagusa, Toyota 470–03, Japan

Publication date: 2001-02-01

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