MICROSTRUCTURE OF CAST SiC_p/2024 Al COMPOSITE AND ITS STRENGTHENING MECHANISM

Acta Metall Sin

1993, Vol. 29

Issue (9): 81-87 DOI:

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MICROSTRUCTURE OF CAST SiC_p/2024 Al COMPOSITE AND ITS STRENGTHENING MECHANISM

LIN Junshan;SHA Min;SHEN Wenrong;LI Pengxing;WU Renjie Shanghai Jiaotong University

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LIN Junshan;SHA Min;SHEN Wenrong;LI Pengxing;WU Renjie Shanghai Jiaotong University. MICROSTRUCTURE OF CAST SiC_p/2024 Al COMPOSITE AND ITS STRENGTHENING MECHANISM. Acta Metall Sin, 1993, 29(9): 81-87.

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Abstract Microstructure of the cast SiC_p/2024 Al composites, containing 5, 10, 15 and20 v.-% SiC particles, under peak-aged state and the strengthening mechanism have beenstudied by TEM observation and Vickers hardness measurements. An increase of dislocationdensity in the matrix and slight reduction of subgrain size may be caused by thereinforcement, but the hardness of the matrix increases no more. Tensile tests show that theelastic modulus and work hardening index increase obviously, and the initial flow stress de-creases first and increases afterwards with the increase of volume fraction of SiC particles. It isbelieved that the stress concentration and the deformation constraint by the reinforcementare two main factors in control of the plastic deformation and strengthening of theSiC_p/2024 composite.

Key words: Al matrix composite microstructure strengthening

Received: 18 September 1993

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1993/V29/I9/81

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