原位反应近液相线铸造TiC_p/7075铝基复合材料的制备

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材料工程 ›› 2009, Vol. 0 ›› Issue (3) : 18-21.

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工艺

原位反应近液相线铸造TiC_p/7075铝基复合材料的制备

刘慧敏, 由国艳, 李峰, 许萍

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7075-TiC Particles Composite Produced by in-situ Reactive Near-liquidus Casting

LIU Hui-min, YOU Guo-yan, LI Feng, XU Ping

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摘要

采用原位反应近液相线铸造方法制备含有少量原位TiC颗粒的7075铝基复合材料,通过透射电镜观察合金中的原位TiC颗粒的分布与形貌,并利用平均截线法测量晶粒尺寸,研究原位颗粒对近液相线铸造7075铝合金铸态组织形成机制的影响。结果发现,原位TiC颗粒比较均匀地分布于基体合金中,尺寸分布于0.3～0.9μm范围内,形貌呈多边形。随着原位TiC颗粒含量的增加,复合材料的铸态组织由蔷薇状组织逐渐转变为等轴晶组织,当原位TiC颗粒的体积分数达到2.5%时,复合材料的平均晶粒尺寸为35.6μm。

Abstract

The microstructures of in-situ reactive near-liquidus cast 7075+X% (volume fraction) TiC (X=0, 0.5, 1.2, 2.5) Al matrix composites were observed using OP. the distribution and morphology of in-situ TiC particles in matrix of 7075 Al alloys were observed by TEM and the average grain sizes were measured using a mean linear intercept method. Effect of in-situ TiC particles on mechanism of formation of microstructure of near-liquidus cast 7075 Al alloy are analyzed. The result shows that as-cast microstructures of the in-situ processed composites reveals a relatively uniform distribution of TiC particles with an average size of region of 0.3-0.9μm and the TiC particles had an angular morphology. The rose flowered structure gradually turned into equiaxed, nondendritic structure with increasing of volume fraction of in-situ TiC particles, whiles TiC particles volume fraction up to 2.5%, the average grains size of composite was 35.6μm.

导出引用

刘慧敏, 由国艳, 李峰, 许萍. 原位反应近液相线铸造TiC_p/7075铝基复合材料的制备[J]. 材料工程, 2009, 0(3): 18-21

LIU Hui-min, YOU Guo-yan, LI Feng, XU Ping. 7075-TiC Particles Composite Produced by in-situ Reactive Near-liquidus Casting[J]. Journal of Materials Engineering, 2009, 0(3): 18-21

中图分类号： TG115.21+3.1

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