Effect of the surface oxide layer on shape memory effect and superelasticity of [011]-oriented Ti-50.1Ni single crystals

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Effect of the surface oxide layer on shape memory effect and superelasticity of [011]-oriented Ti-50.1Ni single crystals	3 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.3390/met12111932

Title: Effect of the surface oxide layer on shape memory effect and superelasticity of [011]-oriented Ti-50.1Ni single crystals
Creator: Chumlyakov, Yuri I.
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Kireeva, Irina V. (физик)
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Saraeva, Anastasia A.
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Pobedennaya, Zinaida V.
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Vyrodova, Anna V.
Date: 2022
DOI: 10.3390/met12111932
Description: Effect of the surface oxide layer on the shape memory effect (SME) and superelasticity (SE) after marforming (deformation in the martensitic state, followed by annealing at 713 K for 0.5 h in an inert helium gas and in dry air) was investigated on Ti-50.1Ni (at.%) single crystals, oriented along [011]-direction, under compression. Quenched [011]-oriented crystals of the Ti-50.1Ni alloy experience a one-stage B2-B190 martensitic transformation (MT) without SE under compression. Marforming leads to a two-stage B2-R-B190 MT and creates conditions for SE. A thin TiO2 oxide layer of 170 nm thick was formed on the sample surface upon annealing at 713 K for 0.5 h in dry air. In [011]-oriented crystals without and with an oxide layer, maximum of the SE value reached 4%, and the SME was 2.4 and 2.6%, respectively. Appearance of an oxide layer upon annealing in dry air: (i) reduces the stresses of B2-phase by 50 MPa from Md to 473 K; (ii) decreases Q = ds/d# from 6.5 GPa in crystals without an oxide layer to 2.0 GPa with an oxide layer and (iii) does not affect the SME and SE values.

Created: 18-12-2023

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Сибирский физико-технический институт Effect of the surface oxide layer on shape memory effect and superelasticity of [011]-oriented Ti-50.1Ni single crystals