Microstructure and mechanical properties of FeCrCoMnNi matrix composite reinforced by TiC particle
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摘要: 采用机械球磨和放电等离子烧结制备了TiC颗粒增强FeCrCoMnNi高熵合金基复合材料,研究了TiC含量和烧结温度对复合材料组织性能的影响。结果表明:随着TiC含量的增加,复合材料中由C和Cr反应形成的M23C6碳化物的数量也增加,复合材料由FCC基体、TiC和Cr23C6碳化物组成。1000 ℃烧结制备的复合材料中,当TiC含量在1 wt.%至9 wt.%时,陶瓷颗粒增强相在复合材料中的分布较为均匀。烧结温度对组织性能有较大的影响,其中1000 ℃和1050 ℃烧结制备的复合材料组织均匀,具有较佳的力学性能。添加7 wt.%TiC的复合材料的硬度和室温屈服强度分别是未添加TiC复合材料的 2.5倍和3倍,这得益于TiC和Cr23C6碳化物硬质相的强化作用。
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关键词:
Abstract: FeCrCoMnNi matrix composites reinforced by TiC particle were prepared by mechanical ball milling and spark plasma sintering. Effects of TiC content and sintering temperature on the microstructure and mechanical properties were evaluated. The results show that the composites are composed of FCC matrix and TiC and Cr23C6 carbide reinforcement, and the amount of Cr23C6, formed by the reaction between Cr and C, increased with the content of added TiC. The reinforcement distributed relatively uniform in the composites for the samples fabricated at 1000 ℃, when the TiC content ranges between 1 wt.% to 9 wt.%. The sintering temperature has a significant effect on the microstructure and mechanical properties, the samples sintered at 1000 ℃ or 1050 ℃ have a relatively uniform microstructure and exhibit better mechanical properties. The hardness and room temperature yield strength of sample with 7 wt.% TiC are about 2.5 times and 3 times respectively of that without TiC, due to the strengthening effect of both TiC and Cr23C6 carbide reinforcement.
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