Volume effect upon martensitic transformation in Ti29.7Ni50.3Hf20 high temperature shape memory alloy. (15th March 2020)

• Record Type: Journal Article
• Authors: Shuitcev, A.; Vasin, R.N.; Fan, X.M.; Balagurov, А.M.; Bobrikov, I.A.; Li, L.; Golovin, I.S.; Tong, Y.X.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 67
• Page End: 70
• Publication Date: 2020-03-15
• Subjects: Martensitic transformation -- TiNiHF -- Neutron diffraction -- Thermal expansion -- High temperature shape memory alloys; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.004
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Thermoelastic martensitic transformation of Ti29.7 Ni50.3 Hf20 alloy was studied by high-resolution and in situ real-time neutron diffraction in the temperature range from 25 °C to 250 °C upon heating and cooling. It was shown that B19′ martensite phase is characterized by strong anisotropy of thermal expansion, lattice parameters of aB19 ′ and bB19 ′ increase while cB19 ′ and β angle decrease with increasing of temperature. Coefficients of thermal expansion for martensite and austenite were determined. The volume effect of transformation in Ti29.7 Ni50.3 Hf20 alloy is 0.75% which is six times larger than that of binary TiNi alloy. Graphical abstract: Image, graphical abstract