Microstructural characterization and superelastic response of a Ni50.3Ti29.7Zr20 high-temperature shape memory alloy

abstract

• 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.

authors

• Karaman, Ibrahim

published proceedings

• SCRIPTA MATERIALIA

author list (cited authors)

• Evirgen, A., Karaman, I., Santamarta, R., Pons, J., & Noebe, R. D.

citation count

• 44

complete list of authors

• Evirgen, A||Karaman, I||Santamarta, R||Pons, J||Noebe, RD

publication date

• June 2014

publisher

• Elsevier  Publisher

published in

• Scripta Materialia  Journal

keywords

• High-temperature Shape Memory Alloys
• Microstructure
• NiTiZr
• Precipitation
• Superelasticity

Digital Object Identifier (DOI)

• 10.1016/j.scriptamat.2014.02.012

start page

• 12

end page

• 15

volume

• 81

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.scriptamat.2014.02.012