The role of H-phase in thermal hysteresis and shape memory properties in Ni50Ti30Hf20alloy. (June 2023)

• Record Type: Journal Article
• Authors: Shuitcev, A.V.; Khomutov, M.G.; Vasin, R.N.; Li, L.; Golovin, I.S.; Zheng, Y.F.; Tong, Y.X.
• Is Part Of: Scripta materialia. Number 230(2023)
• Publication Date: 2023-06
• Subjects: High temperature shape memory alloys -- NiTiHf -- Martensitic transformation -- H-phase; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2023.115391
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Ni50 Ti30 Hf20 high temperature shape memory alloy was aged at 550 °C for 10 h and 450 °C for 50 h which corresponds to the peak hardening state with equal gain in strength caused by different size/volume fraction ratio of nano-precipitation of H-phase. In order to determine the effect of such structures on the martensitic transformation, thermal cycling and shape-memory properties were measured. It is shown that finer precipitates with higher volume fraction provide superior dimensional stability, good thermal cycling stability and small transformation hysteresis. Graphical abstract: Image, graphical abstract