Short-time creep behavior of (TiB + TiC + Y2O3) reinforced titanium matrix composite in the range of 600 °C to 700 °C

• Published in: Materials characterization 2024-04, Vol.210, p.113785, Article 113785
• Main Authors: Han, Shiwei, Xu, Lijuan, Zheng, Yunfei, Liang, Zhenquan, Chi, Dazhao, Tian, Jing, Xiao, Shulong
• Format: Article
• Language: English
• Subjects: Creep behavior; Microstructure evolution; Reinforcement; Silicide; Titanium matrix composite
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2024.113785

A titanium matrix composite reinforced by TiB, TiC and Y2O3 was prepared by induction skull melting. The creep behavior of the composite was tested at the temperature range from 600 °C to 700 °C in short time to investigate the deformation mechanism and microstructure involution. The as-cast composite shows a typical basket-weave microstructure. At the stress of 150 MPa, the stress exponents of the composite are 3.48 at 600 °C and 5.33 at 700 °C, corresponding to the deformation mechanism mainly controlled by solute-dragging and dislocation climbing respectively. Reinforcements added hinder dislocations movement effectively, which improves the creep resistance of the composite. As the creep temperature rises, the solubility of β-Ti increases, accompanied by the precipitation of silicides with different morphologies. Silicides play a role in pinning dislocations and hindering interface from migration. The dislocation movement and rearrangement during creep lead to the formation of sub-grains. •The short-time creep behavior and microstructure evolution of (TiB + TiC+Y2O3)/α-Ti composite were studied.•The characteristics of reinforcements and their interaction with silicides were discussed.•The morphologies of silicides at different temperatures were investigated.•The creep deformation mechanisms were analyzed by creep exponent and dislocation movement.