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Strength of Al-Zn-Mg-Cu matrix composite reinforced with SiC particles

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Abstract

The AA7075 alloys reinforced with SiC and without SiC particles were fabricated by a pressureless infiltration method, and then, their tensile properties and microstructures were analyzed. The spontaneous infiltration of molten metal at 800 °C for 1 hour under a nitrogen atmosphere made it possible to fabricate 7075 Al matrix composite reinforced with SiC, as well as a control 7075 Al without SiC. A significant strengthening even in the control alloy occurred due to the formation of in-situ AlN particle even without an addition of SiC particles. Composite reinforced with SiC particles exhibited higher strength values than the control alloy in all aging conditions (underaged (UA), peak-aged (PA), and overaged (OA)), as well as a solution treated condition. Spontaneous infiltration was further prompted owing to the combined effect of both Mg and Zn. This may lead to an enhancement of wetting between the molten alloy and the reinforcement. Consequently, strength improvement in a composite may be attributed to good bond strength via enhancement of wetting. The grain size of the control alloy is greatly decreased to about 2.5 µm compared to 10 µm for the commercial alloy. In addition, the grain size in the composite is further decreased to about 2 µm. These grain refinements contributed to strengthening of the control alloy and the composite.

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Authors and Affiliations

  1. the School of Metallurgical and Materials Engineering, Kookmin University, 136-702, Seoul, Korea

    Kon Bae Lee (Professor) & Hoon Kwon (Professor)

  2. the Center for Advanced Aerospace Materials, POSTECH, 790-784, Pohang, Korea

    Hoon Kwon (Professor)

Authors
  1. Kon Bae Lee
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  2. Hoon Kwon
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Lee, K.B., Kwon, H. Strength of Al-Zn-Mg-Cu matrix composite reinforced with SiC particles. Metall Mater Trans A 33, 455–465 (2002). https://doi.org/10.1007/s11661-002-0106-5

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  • DOI: https://doi.org/10.1007/s11661-002-0106-5

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