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FeAl/TiC composites were fabricated by reactive hot pressing blended elemental powders. The effects of TiC content, composition of the binder phase and Ni alloying on the densification process and mechanical properties of the composites were studied. The results show that the densities of the composites decrease with the increase of TiC content. Closely related with their porosities and flaw densities, the hardness and bend strength of the composites show peak values with the increase of TiC content. Higher content of Al in the binder phase was beneficial to densification, however it deteriorates the mechanical properties of the composites. The addition of Ni significantly improves the densities of the composites by enhancing matter transfer in the binder phase. By alloying with Ni, the mechanical properties of the composites are greatly improved due to the increase of the density, together with solid solution-strengthening the binder phase and promoting ductile fracture of FeA1. 相似文献
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采用混合粉热压工艺制备了FcAl/TiC复合材料。研究了TiC含量、粘结相成分以及反应热压工艺对致密化过程和力学性能的影响。研究结果表明:复合材料的密度随TiC含量增加而减小;硬度和抗弯强度随TiC体积分数增加而出现峰值,增加Al含量有利于致密化,但因引入过多的氧化夹杂和热空位会导致力学性能降低;热压温度和压力等工艺参数也对材料的性能有影响。 相似文献
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1 INTRODUCTIONOver the past few decades, considerable inves tigations have been carried out to identify alterna tive binders for cermets in order to improve theirmechanical properties and also to overcome certainshortcomings, such as high cost and density, lowoxidation and corrosion resistance, and environ mental toxicity[1, 2]. Iron aluminides are of particu lar interest due to their low cost and density, highspecific strength, environmental friendliness andexcellent oxidati… 相似文献
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FeAl合金研究进展与发展方向 总被引:2,自引:0,他引:2
综述了FeAl合金的物理、力学性质,分析了造成合金延性低的主要原因——环境氢脆的产生原因和影响因素,概述了合金的加工方法和合金设计原则,最后指出了FeAl合金以后的研究重点和发展方向。 相似文献
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粉末冶金制备TiAl基合金板材的研究现状及趋势 总被引:7,自引:1,他引:7
综述了TiAl基合金板材的元素粉法和预合金粉法2种粉末冶金制备工艺,介绍了元素粉末法、金属箔片法、预合金粉热轧法、物理气相沉积法和等离子喷涂法等工艺的制备过程和材料性能,论述了上述方法的特点和发展趋势。 相似文献
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加Ni 的FeAl/TiC 复合材料的制备与性能研究 总被引:1,自引:0,他引:1
采用元素粉反应热压工艺制备了FeAl/ TiC 复合材料。研究了Ni 合金化对材料致密化和力学性能的影响。结果表明, 复合材料的密度随TiC 体积分数的增加而减小, Ni 的加入促进了FeAl 相中的物质迁移, 从而显著改善了致密化过程。材料的力学性能随Ni 的加入而大幅改善, 这一方面是因为Ni 的加入提高了材料的致密度, 此外Ni 的加入还通过固溶强化粘结相、增强FeAl-TiC 界面强度、增加FeAl 相的延性断裂、减小FeAl 相的烧结膨胀等作用改善了材料的力学性能。 相似文献
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FeAl/TiC composites were fabricated by reactive hot pressing blended elemental powders. The TiC content was varied from 50% to 80% (volume fraction) and the aluminum content in the binder phase was changed from 40% to 50%(mole fraction). The effects of these compositional changes on the densification process and mechanical properties were studied. The results show that with the increase of TiC content, densities of the composites decrease due to insufficient particle rearrangement aided by dissolution - reprecipitation reaction during hot pressing. Closely related with their porosities and defect amount, the hardness and bend strength of the composites show peak values,attaining the highest values with TiC content being 70% and 60%, respectively. Increasing the aluminum content is beneficial to the densification process. But the hardness and bend strength of the composites are reduced to some extent due to the formation of excessive oxides and thermal vacancies. 相似文献
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