Effect of N addition on nano-domain structure and mechanical properties of a meta-stable Ti-Zr based alloy. (October 2021)

• Record Type: Journal Article
• Authors: Fu, Jie; Kim, Hee Young; Miyazaki, Shuichi
• Is Part Of: Scripta materialia. Number 203(2021)
• Publication Date: 2021-10
• Subjects: Titanium alloys -- Shape memory alloys -- Martensitic phase transformation -- Metastable phases -- Elastic behavior; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114068
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: This study showed that a superior combination of high strength and ultra-low modulus can be achieved by the addition of N in a meta-stable β-type Ti–Zr based alloy undergoing stress-induced martensitic transformation. A Ti–18Zr–3Nb–2Mo–3Sn alloy exhibited a very low Young's modulus; however, the stress-induced martensitic transformation occurred at a low stress level. The addition of N facilitated the formation of nano-sized lattice modulation (nano-domain) structure and impeded the stress-induced martensitic transformation, leading to higher apparent yield stress, narrower stress hysteresis and large non-linear elasticity. A Ti–18Zr–3Nb–2Mo–3Sn–1.2N alloy exhibited an excellent combination of a low Young ' s modulus of 41 GPa and a high strength of 920 MP along with a large recovery strain with negligible hysteresis. Graphical abstract: Image, graphical abstract