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Microstructure transformation and physical and mechanical properties of ultrafine‐grained and nanocrystalline TiNi alloys in multiple martensitic transformations B2‐B19’
Author(s) -
Churakova A.A.,
Gunderov D.V.,
Dmitriev S.V.
Publication year - 2018
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201700179
Subject(s) - materials science , nanocrystalline material , metallurgy , diffusionless transformation , nickel titanium , microstructure , martensite , hardening (computing) , nickel , titanium , temperature cycling , thermal , shape memory alloy , composite material , thermodynamics , nanotechnology , physics , layer (electronics)
Comprehensive studies on the impact of multiple martensitic transformations B2‐B19′ on the structure and properties of ultrafine‐grained and nanocrystalline titanium‐nickel alloys are implemented. It is shown that in coarse‐grained, ultrafine‐grained and nanocrystalline titanium‐nickel alloys consecutive changes in the structure and properties take place, which are induced by phase hardening, when the number of thermocycles increases up to n = 100 with quick heating and quick cooling to ‐196 °C. During thermal cycling of coarse‐grained and ultrafine‐grained Ti 50 Ni 50 alloys via the chosen regimes, the direction of martensitic transformation temperatures changes. First the temperatures reduce, then they increase with the number of thermocycles growing. The transformation temperatures in the ultrafine‐grained state of Ti 49.15 Ni 50.85 are more resistant to thermal cycling than in the coarse‐grained state. Phase hardening occurs more intensively in ultrafine‐grained states of the studied titanium‐nickel alloys than in coarse‐grained state.