Ultrahigh yield strength heterostructured titanium matrix composites by controlling the α /α′ precipitation sequence

• Published in: Journal of alloys and compounds 2024-11, Vol.1004, p.175886, Article 175886
• Main Authors: Zhu, Ke, Huang, Jin, Nie, Wei, Liu, Ruxia, Xiao, Yong, Zhang, Jian, Luo, Guoqiang, Shen, Qiang
• Format: Article
• Language: English
• Subjects: Martensitic transformation; Mechanical properties; Titanium matrix composites (TMCs)
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.175886

Enhancing the strength and toughness of materials in a synergistic manner is a longstanding challenge. The content of β-stabilizing element W in Ti alloys is controlled using a chemical boundary engineering (CBE) strategy. Heterostructured Ti-xW composites are designed with α grain boundaries as the outer shell, α/β lamellar organization as the intermediate transition layer, and acicular martensite as the core region. This material exhibits a remarkable compressive yield strength of 2100 MPa, surpassing the majority of existing titanium matrix composites. The exceptional strength primarily arises from the precipitation strengthening of α/β lamellar organization and acicular martensite in the core region. This study holds significant implications for the development and design of high-strength heterostructured titanium matrix composites. •The heterostructured Ti-W composites were designed and fabricated.•Unique heterogeneous structure with ultrahigh yield strength.•The effect of W content on the microstructure of Ti-W composite was analyzed.•The strengthening mechanism of heterogeneous structure were highlighted.