Microstructure and Mechanical Properties of In-situ Synthesized TiB+TiC Reinforced Ti-Fe Matrix Composites
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摘要: 以Ti粉、Fe粉和B4C粉末为原料,采用冷等静压+高真空烧结方法制备了不同(TiB+TiC)增强相体积分数的Ti-Fe合金基复合材料(Fe元素质量分数为5%~15%),重点讨论了Fe含量和增强相对复合材料微观组织和力学性能的影响规律。结果表明,在1 150~1 250℃烧结温度下制备出Ti-Fe合金基复合材料致密度随Fe含量与增强相体积分数升高而降低。Fe含量增加使基体中α相层片状结构细化,而B4C粉末的添加生成原位自生TiC颗粒和TiB纤维增强相,基体结构由层片状转变为等轴状。材料力学性能随Fe含量和增强相体积分数增加而提高。在1 150℃烧结制备的Ti-15%Fe-10vol%(TiB+TiC)复合材料硬度(HV)达到334,抗压强度达到2 040 MPa。
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关键词:
- Ti-Fe基复合材料 /
- B4C粉末 /
- 冷等静压+高真空烧结 /
- 微观结构 /
- 力学性能
Abstract: Ti-Fe matrix composites were prepared by cold isostatic pressing（CIP）+ vacuum sintering using Ti,Fe and B4C powders as the raw materials.The effects of the Fe content and volume fraction of the reinforcements on the microstructure and mechanical properties of the composite were discussed.The results show that the relative density of the composites reduces with increase of the Fe content and volume fraction of reinforcements at 1 150 ℃ to 1 250 ℃ of sintering temperature.The α lamellar structure is refined with increase in the Fe concentration.TiB whiskers and TiC particles can be in-situ synthesized as the reinforced phases with the addition of B4C powder,and the microstructure of the matrix changes from lamellar to equiaxed structure.The mechanical properties of the composite increase with increase of the Fe content and the volume fraction of reinforcements.The composite of Ti-15%Fe-10%（TiB+TiC）having a micro-hardness of 334 HV and compression strength of 2 040 MPa can be obtained at 1 150 ℃ of sintering temperature. -
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