Microstructural characterization and superelastic response of a Ni50.3Ti29.7Zr20 high-temperature shape memory alloy
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The microstructure and superelastic response of a Ni50.3Ti 29.7Zr20 high-temperature shape memory alloy were studied. The alloy exhibited a recoverable strain level of 5% at 170 °C and near-perfect superelasticity up to 250 °C under 3% applied strain when fine precipitates were present. In this case, large martensite variants easily formed during the stress-induced martensitic transformation while dislocation motion was impeded. In contrast, poor superelastic response was obtained in samples containing large particles that constrain martensite formation to channels between elongated precipitates. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
author list (cited authors)
Evirgen, A., Karaman, I., Santamarta, R., Pons, J., & Noebe, R. D.