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Published in: Shape Memory and Superelasticity 1/2020

27-01-2020 | Technical Article

Effect of Grain Size and Ageing-Induced Microstructure on Functional Characteristics of a Ti-50.7 at.% Ni Alloy

Authors: K. A. Polyakova, E. P. Ryklina, S. D. Prokoshkin

Published in: Shape Memory and Superelasticity | Issue 1/2020

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Abstract

The effect of the microstructure formed as a result of ageing in a Ti-50.7 at.% Ni alloy with different B2 austenite grain sizes on its functional properties under bending is studied. The maximum recovery strain of εr = 15.5% is obtained as a result of annealing at 600 °C for 1 h (fine-grained structure). The subsequent degradation of the functional properties after ageing is caused by the reduction of the difference between the dislocation and transformation yield stresses. The material with a coarse-grained structure and the worst combination of functional properties after recrystallisation annealing, on the contrary, represents the poorest combination and should be aged in order to improve the shape recovery characteristics. The revealed regularities can be used as an additional tool for the precise regulation of functional properties in shape memory alloys.
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Metadata
Title
Effect of Grain Size and Ageing-Induced Microstructure on Functional Characteristics of a Ti-50.7 at.% Ni Alloy
Authors
K. A. Polyakova
E. P. Ryklina
S. D. Prokoshkin
Publication date
27-01-2020
Publisher
Springer US
Published in
Shape Memory and Superelasticity / Issue 1/2020
Print ISSN: 2199-384X
Electronic ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-020-00269-z

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