Abstract The effects of Ni content and sintering temperature on the microstructure and mechanical properties of TiC-Ni composites prepared by selective carburization of Ti-Ni alloys were investigated. It was found that coherent boundaries between TiC and Ni were formed after sintering because Ni was attached to TiC in the powdered form. Grain growth by dissolution and precipitation of TiC in Ni was limited during sintering at 1400 °C (below melting point of Ni). As a result, the grain size of TiC did not change with increase in the amount of Ni. However, the grain size of TiC increased with an increase in Ni content at 1500 °C (above melting point of Ni) because the dissolution and precipitation of TiC was promoted in the melted Ni. The fracture toughness (∼18 MPa m1/2) of TiC-Ni composite fabricated at 1500 °C in this study was higher than that (∼11 MPa m1/2) of TiC-Ni composite in the previous study (sintered at 1330 °C) because of effect of the enlarged grains. The hardness was also enhanced by decreasing the content of Ni (13 GPa → 13.5 GPa). Consequentially, it was found that the microstructure and mechanical properties of TiC-Ni composites were customized by controlling the Ni content and sintering temperature in the process suggested in this study.

中文翻译：

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Ni含量和烧结温度对Ti-Ni合金选择性渗碳制备TiC-Ni复合材料组织和力学性能的影响

摘要 研究了Ni含量和烧结温度对Ti-Ni合金选择性渗碳制备的TiC-Ni复合材料组织和力学性能的影响。发现在烧结后在 TiC 和 Ni 之间形成了连贯的边界，因为 Ni 以粉末形式附着在 TiC 上。在 1400 °C（低于 Ni 的熔点）烧结期间，Ni 中 TiC 的溶解和沉淀导致的晶粒生长受到限制。结果，TiC 的晶粒尺寸不随 Ni 量的增加而变化。然而，在 1500 °C（高于 Ni 的熔点）时，TiC 的晶粒尺寸随着 Ni 含量的增加而增加，因为 TiC 在熔化的 Ni 中的溶解和沉淀得到促进。本研究中在 1500 °C 下制造的 TiC-Ni 复合材料的断裂韧性 (~18 MPa m1/2) 高于先前研究中 (~11 MPa m1/2) 的 TiC-Ni 复合材料（在 1330 °C 下烧结） C) 由于晶粒增大的影响。通过降低Ni含量（13 GPa → 13.5 GPa）也提高了硬度。因此，发现通过控制本研究建议的工艺中的 Ni 含量和烧结温度，可以定制 TiC-Ni 复合材料的微观结构和机械性能。