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钛工业进展:2020,37(6):23-28
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不同碳源TiC/Ti复合材料的显微组织及力学性能
(1:太原理工大学2:哈尔滨工业大学金属精密热加工国家级重点实验室)
Microstructure and Mechanical Properties of TiC/Ti Composites with Different Carbon Sources
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中文摘要: 采用原位熔铸法制备了不同TiC添加量以及不同碳源(碳粉末、碳纤维和碳纳米管)的TiC/Ti复合材料,研究了TiC添加量和碳源种类对铸态和锻态TiC/Ti复合材料显微组织的影响,并对不同碳源制备的铸态和锻态复合材料进行了断裂韧性和室温压缩性能测试。结果发现,TiC/Ti复合材料主要由α-Ti和TiC组成;α片层宽度随着TiC体积分数的增加逐渐下降,TiC呈条状或片状。经过锻造,TiC呈近等轴状,α片层进一步细化。以碳粉末作为原位反应碳源制备的铸态TiC/Ti复合材料,断裂韧性较高,以碳纤维和碳纳米管作为碳源时,断裂韧性较低;以不同碳源制备的铸态复合材料,室温抗压强度和屈服强度无明显差异。
Abstract:TiC/Ti composites with different TiC addition and different carbon sources(carbon powder, carbon nanotubes or carbon fibers) were prepared by in-situ casting route. The effect of different TiC addition and carbon sources on as-cast and forged TiC/Ti composites were investigated. The fracture toughness and room temperature compressive properties were also tested. The results show that TiC/Ti composites are mainly composed of α-Ti and TiC. With the increasing volume fraction of TiC, the width of the lamellar α is gradually decreased; the morphology of TiC is banding or flaky. After forging, the TiC is nearly equiaxed, and the lamellar α is further refined. The fracture toughness of as cast TiC/Ti composites prepared with carbon powder as in-situ reactive carbon source is higher than that with carbon fiber or carbon nanotube as carbon source.There is no significant difference in the compressive strength and yield strength of as cast TiC/Ti composites prepared with different carbon sources.After forging, the fracture toughness decreases overall, while the room temperature compressive strength and yield strength increase overall.
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基金项目:山西省重点研发计划资助项目(201903D421084,201903D121056);; 山西省自然科学基金资助项目(201801D221141,201801D121091)
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