Acta Metall Sin  1998, Vol. 34 Issue (11): 1188-1192    DOI:

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EFFECTS OF PARTICLE SIZE AND MATRIX STRENGTH ON THE FAILURE MECHANISM OF SiC_p REINFORCED ALUMINIUM MATRIX COMPOSITES

LU Yuxiong;BI Jing;CHEN Liqing;ZHAO Mingjiu (Institute of Metal Research;Chinese Academy of Sciences;Shenyang 110015)

LU Yuxiong;BI Jing;CHEN Liqing;ZHAO Mingjiu (Institute of Metal Research;Chinese Academy of Sciences;Shenyang 110015). EFFECTS OF PARTICLE SIZE AND MATRIX STRENGTH ON THE FAILURE MECHANISM OF SiC_p REINFORCED ALUMINIUM MATRIX COMPOSITES. Acta Metall Sin, 1998, 34(11): 1188-1192.

Abstract References Related Articles Recommended Metrics Download:  PDF(1660KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Three different sizes(3.5, 10, 20μm) of SiC particulate and Al-Cu alloy powder were employed to fabricate composites via powder metallurgy technique. The fracture surfaces of the tensile specimen and EDX analysis show that the reinforcement size has a prominent effect on the failure mechanism of the composites. When the reinforcement size exceeds 10 μm, the failure of the MMC results from the SiC.cleavage crack.The breakage is due to the cavity and micro-crack formed by Al-SiC interfacial tearing,however,when the reinforcement size is 3.5 μm. The Al tearing ridge on the SiCp. surface is similar to the conglutination of Al by pulling-out of whisker in SiCw/Al. The tensile test result shows that the MMCs reinforced with small size of particulate has an elevated ultimate tensile strength and elongation. The low strength MMCs, due to their lower matrix strength, has increased plastics and their failure under tensile load is dominated by cavity nucleation, growth and coalescence nearby the SiCp. Key words:  aluminum matrix composites      powder metallurgy      particle size      matrix strength      failure mechanism      Received:  18 November 1998      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I11/1188 1 Nutt S R, Duva J M. Scr Metall,1986;20:1055 2 Divecha A P,Fishman S G,Karmaker S D.J Met,1981;33:12 3 McDonels D L.Metall Trans,1985 16A:1105 4 You C P,Thompson A W,Bernstein I M、 Scr Metall;1987;21:181 5 Lloyd D J. 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