| 1 | Mechanical Properties of a Low-thermal-expansion Aluminum/Silicon Composite Produced by Powder Metallurgy显示文摘Al matrix composite containing high volume fraction silicon has been promising candidate for lightweight and low-thermal-expansion components.Whereas,optimization of its mechanical properties still is an open challenge.In this article,a flexile powder metallurgy processing was used to produce a fully dense Al—4.0Cu(wt%) alloy composite reinforced with 65 vol.%Si particles.In this composite,Si particles were homogenously distributed,and the particle size was refined to the range of 3—15 μm.Tensile and flexural strength of the composite were 282 and 455 MPa,respectively,about 100%and 50%higher than the best properties reported in literature.The measured fracture toughness of the composite was 4.90 MPa m^(1/2).The improved strength of 65%Si/AI was attributed to the optimized particle characteristics and matrix properties.This investigation is expected to provide a primary understanding of the mechanical behaviors of Si/AI composites,and also promote the structural applications of this low-thermal-expansion material. | Y.Q.Liu S.H.Wei J.Z.Fan Z.L.Ma T.Zuo | 2014 | Journal of Materials Science & Technology2014，30，4： | 8 |
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