Microstructures and mechanical properties of TiC-particulate-reinforced Ti-Mo-Al intermetallic matrix composites

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:790

Article

Lu, Y.¹  Watanabe, M.¹  Miyata, R.¹  Nakamura, J.¹  Yamada, J.²  Kato, H.²  Yoshimi, K.¹ 

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

关键词: Intermetallics;    Composites;    Casting methods;    Stress/strain measurements;    Grains and interfaces;   

DOI  :  10.1016/j.msea.2020.139523

来源: Elsevier

【 摘 要 】

The microstructures and mechanical properties of titanium carbide (TiC)-particulate-reinforced B2-structured Ti-Mo-Al intermetallic matrix composites (Ti-Mo-Al-TiC composites) with various matrix compositions and TiC contents have been systematically investigated. All the Ti-Mo-Al-TiC composites were composed of a B2-ordered Ti-Mo-Al matrix and off-stoichiometric TiC particles. Fine globular and rod-like TiC particles preferentially formed in the interdendritic regions of the matrix. Primary TiC in relatively large particle sizes and a uniform particle distribution were observed in the composites containing 10 at.% TiC. The compression strength was found to depend on both the matrix composition and TiC content. The contribution of TiC particles to the overall strength of the composites at high temperatures (>800 degrees C) was not as strong as that at mom temperature. Compared with the unreinforced Ti-Mo-Al matrix materials, the Ti-Mo-Al-TiC composites exhibited improved high-temperature deformability. The composites deformed above 800 degrees C showed the plastic deformation of TiC particles. The strengthening mechanisms involved in the Ti-Mo-Al-TiC composites are discussed by correlating the microstructural features with the strengths of the composites. The impressive mechanical properties of the Ti-Mo-Al-TiC composites endow them with great potentials in high-temperature structural applications.

【 授权许可】

Free