Characterization of centrifugal cast functionally graded aluminum-silicon carbide metal matrix composites
Characterization of centrifugal cast functionally graded aluminum-silicon carbide metal matrix composites
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DOI：
10.1016/j.matchar.2010.06.002
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发表时间：
2010-10
影响因子：
4.7
通讯作者：
T. Rajan;R. M. Pillai;B. C. Pai
中科院分区：
文献类型：
--
作者：
T. Rajan;R. M. Pillai;B. C. Pai
本文研究了以356铸造铝合金和2124变形铝合金为基体，采用液态金属搅拌铸造和水平离心铸造工艺制备的SiC颗粒增强的功能梯度复合材料的性能。在Al（356）-SiC和Al（2124）-SiC FGMMC铸件的外周处分别获得最多45%和40%的SiC颗粒。Al（356）-SiC和Al（2124）-SiC FGMMC在热处理后外周处获得的最大硬度分别为155 BHN和145 BHN。已经发现基质合金的凝固范围决定了从颗粒富集区到贫化区的过渡性质。这些复合材料适用于制造要求非常高的表面硬度和耐磨性以及高比强度的工程部件。
The present investigation is on characterization of functionally graded composites based on 356 cast and 2124 wrought aluminum alloys reinforced with SiC particles of 23μm average particle size processed by liquid metal stir casting followed by horizontal centrifugal casting. A maximum of 45 and 40% SiC particles are obtained at the outer periphery of the Al(356)-SiC and Al(2124)-SiC FGMMC casting respectively. The maximum hardness obtained at the outer periphery after heat treatment for Al(356)-SiC and Al(2124)-SiC FGMMC are 155BHN and 145BHN respectively. The freezing range of the matrix alloy has been found to dictate the nature of transition from particle enriched to depleted zone. These composites are suitable for making engineering components, which require very high surface hardness and wear resistances with high specific strength.