Simultaneously enhanced strength and ductility in a metastable β-Ti alloy by stress-induced hierarchical twin structure. (15th July 2020)

• Record Type: Journal Article
• Authors: Ren, Lei; Xiao, Wenlong; Kent, Damon; Wan, Min; Ma, Chaoli; Zhou, Lian
• Is Part Of: Scripta materialia. Number 184(2020)
• Page Start: 6
• Page End: 11
• Publication Date: 2020-07-15
• Subjects: Metastable β-Ti alloy -- Microstructure -- Strength -- Ductility -- Hierarchical twin structure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.039
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A novel metastable β-Ti alloy Ti-4Mo-3Cr-1Fe with high strength and high ductility was developed through controlling the alloyʼs stability and deformation mechanisms. The microstructure consists of randomly oriented β-grains containing an even distribution of athermal ω precipitates. Under tensile loading, the alloy exhibits unprecedented and comprehensive mechanical properties including a high yield strength of 870 MPa, excellent total elongation of 41% and an ultrahigh strain hardening rate of 2.5 GPa. Based on investigations of deformation microstructures, the superior mechanical properties are attributed to stress-induced formation of a complex nano-scale hierarchical twin structure which is promoted by reversion of ω precipitates. Graphical abstract: Image, graphical abstract