Effect of one family of Ti3Ni4 precipitates on shape memory effect, superelasticity and strength properties of the B2 phase in high-nickel [001]-oriented Ti-51.5 at.%Ni single crystals
| Autor: | M. V. Zherdeva, A.S. Eftifeeva, N. Yu. Surikov, A. I. Tagiltsev, E. E. Timofeeva, E. Yu. Panchenko, YuI. Chumlyakov |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering фазовое превращение chemistry.chemical_element Shape-memory alloy Condensed Matter Physics материалы с памятью формы монокристаллы Stress (mechanics) Nickel Compressive strength chemistry Mechanics of Materials Diffusionless transformation Phase (matter) Pseudoelasticity сверхэластичность Particle General Materials Science Composite material |
| Zdroj: | Materials science and engineering A. 2021. Vol. 832. P. 142420 (1-8) |
| Popis: | In this study, we investigated the effect of the number of Ti3Ni4 particle variants (obtained via stress-free and stress-assisted aging at 823 K for 1 hour) on the shape memory effect, superelasticity, and strength properties of the B2-phase in high-nickel [001]-oriented Ti-51.5 at.% Ni single crystals. Four crystallographically equivalent variants of lenticular Ti3Ni4 particle with the {111}B2 habit plane and a diameter of 250–300 nm were obtained via stress-free aging. Aged under an applied compressive stress of 150 MPa along the direction, single crystals contain predominantly one variant of Ti3Ni4 particle, forming plane-parallel plates with lengths from 1 to 5 μm. The oriented arrangement of semi-coherent Ti3Ni4 particles leads to the formation of long-range stress fields, an increase of 23 K in the martensitic transformation (MT) starting temperature Ms, the induction of a two-way shape memory effect, and a decrease of 200 MPa in the stress required to obtain the maximum reversible strain (1.5–1.7%) during cooling/heating cycles compared to stress-free aged single crystals. The number of variants of Ti3Ni4 particle determines the mechanism of the formation of B19'-martensite and the strength properties of the B2-phase (1600 MPa in stress-assisted aged crystals and 2100 MPa in stress-free aged crystals). |
| Databáze: | OpenAIRE |
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