Development of a high strength and high ductility near β-Ti alloy with twinning induced plasticity effect

• Published in: Scripta materialia Vol. 156; pp. 47 - 50
• Main Authors: Ren, Lei, Xiao, Wenlong, Ma, Chaoli, Zheng, Ruixiao, Zhou, Lian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2018
• Subjects: d-Electron theory; Mechanical properties; Microstructural evolution; Near β-Ti alloys; Twinning; Near β-Ti alloys; Mechanical properties; Microstructural evolution; Twinning; d-Electron theory
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2018.07.012

A multi-alloyed near β-Ti alloy Ti-6Cr-4Mo-2Al-2Sn-1Zr (Ti-64221) with high strength and high ductility was designed utilizing the d-electron theory combined with molybdenum equivalence approaches. Mechanical properties and microstructural evolution of the β-solution treated alloy were investigated. The results show that Ti-64221 alloy exhibits excellent tensile strength, ultra-high total elongation and high ability of strain hardening. The product of strength and elongation is as high as 42.6 GPa% exceeded those achieved earlier in β-Ti alloys. Mechanical activation of {332}〈113〉 and {112}〈111〉 twinning and the stress-induced phase transformation during the process of plastic deformation are benefited for enhanced strength and ductility. [Display omitted]