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27.01.2020 | Technical Article | Ausgabe 1/2020

Shape Memory and Superelasticity 1/2020

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

Shape Memory and Superelasticity > Ausgabe 1/2020
K. A. Polyakova, E. P. Ryklina, S. D. Prokoshkin
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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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