Effect of Aging Treatment on R Transformation in Nanocrystalline Ti–50.9 at.% Ni Alloy

• Published in: Russian physics journal Vol. 65; no. 10; pp. 1775 - 1780
• Main Authors: Girsova, S. L., Poletika, T. M., Bitter, S. M., Lotkov, A. I.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-02-2023; Springer; Springer Nature B.V
• Subjects: Aging (metallurgy); Alloying effects; Alloys; Condensed Matter Physics; Hadrons; Heavy Ions; Lasers; Low temperature; Mathematical and Computational Physics; Nanocrystals; Nickel base alloys; Nuclear Physics; Optical Devices; Optics; Particle precipitation; Photonics; Physics; Physics and Astronomy; Spatial distribution; Theoretical; nanocrystalline TiNi alloy; Ti; martensitic transformations; deformation; Ni; particles; aging heat treatment; phase morphology
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-023-02830-6

Effects of the size, morphology, and spatial distribution of coherent Ti
3
Ni
4
particles in a nanocrystalline Ti– 50.9 at.% Ni alloy with an inhomogeneous grain-subgrain structure on the
B
2 →
R
transformation and the morphology of the
R
phase are studied. It has been found that the morphology of the
R
phase in the alloy depends on the aging temperature and changes from nanodomain observed after low-temperature aging (300°C) to lamellar self-accommodative morphology formed under conditions of intense particle precipitation (400°C). It is shown that this is due to a change in the spatial distribution of particles from location on dislocations to precipitation near low-angle boundaries. In the case of lamellar morphology of self-accommodation, the
R
-plates reorientation develops localized in a Lüders-like manner.