Investigation of the microstructural characteristics and mechanical properties of vacuum-sintered Ti–8Mo–3Mn-XVC composites

• Published in: Vacuum 2024-04, Vol.222, p.113035, Article 113035
• Main Authors: Huang, Kuo-Tsung, Chang, Shih-Hsien, Chen, Yun-Fang, Liang, Cheng, Li, Chien-Lun
• Format: Article
• Language: English
• Subjects: EBSD; TEM; Ti-8Mo–3Mn-xVC composites; TRS; Vacuum sintering
• ISSN: 0042-207X; 1879-2715
• DOI: 10.1016/j.vacuum.2024.113035

This study fabricated Ti–8Mo–3Mn-xVC composites and added different proportions of VC powders (where X was 1, 3, and 5 mass%, respectively) by the vacuum sintering process of the powder metallurgy technique, which were simultaneously vacuum sintered at 1240, 1260, 1280, and 1300 °C for 1 h, respectively. The experimental results indicate that the specimens possessed the best mechanical properties when the Ti–8Mo–3Mn–1VC alloys were sintered at 1300 °C for 1 h. Among them, the relative density increased to 98.11 ± 0.12 %, while the TRS enhanced to 1630.3 ± 44.8 MPa, the flexural modulus increased to 55.1 ± 0.9 GPa, and the hardness enhanced to 69.0 ± 0.3 HRA, respectively. The EBSD and TEM results also show that the VC induced in situ formations of TiC during the sintering process, which were consistently dispersed in the Ti matrix. Moreover, the V atoms of VC became β-stabilizer elements, which formed a solid solution in the Ti matrix and further improved the mechanical properties of the Ti–8Mo–3Mn alloys. •Ti–8Mo–3Mn–1VC alloy had the highest TRS value (1630.3 MPa) after 1300 °C for 1 h.•1300°C-sintered Ti–8Mo–3Mn–1VC alloy had the highest flexural modulus (55.1 GPa).•In situ reaction of VC + Ti .→ V + TiC occurred during the Ti–8Mo–3Mn–1VC alloy.•EBSD results shows the Ti–8Mo–3Mn–1VC alloy possesses α-Ti, β-Ti, and TiC phases.•TEM reveals the TiC precipitated in this experiment with a NaCl structure.