Abstract
This study fabricated Ti-25Nb-25Mo-15Ni-xCr3C2 composites and added differing proportions of Cr3C2 powder (where x represents 1, 3, and 5 mass%, respectively) using the vacuum sintering process-a powder metallurgy technique. The composites were simultaneously vacuum sintered at 1150, 1175, 1200, and 1225°C for 1 h, respectively. The experimental results indicate that the specimens exhibited optimal properties when the Ti-25Nb-25Mo-15Ni-1Cr3C2 composites were sintered at 1225°C for 1 h. The sintered density increased to 7.29 ± 0.15 g·cm−3, while the TRS improved to 684.23 ± 24.65 MPa, the flexural modulus increased to 69.64 ± 0.21 GPa, and the hardness rose to 75.88 ± 1.19 HRA. The EBSD and TEM results show that niobium, molybdenum, and chromium can form a strong solid solution with titanium, contributing to the solid solution strengthening effect. Moreover, nickel forms TiNi and Ti2Ni intermetallic compounds with titanium, which are dispersed in the titanium matrix and effectively enhance its mechanical properties.
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