Shape memory characteristics of Ti49.5Ni25Pd25Sc0.5 high-temperature shape memory alloy after severe plastic deformation Academic Article

abstract

• A Ti49.5Ni25Pd25Sc0.5 high-temperature shape memory alloy is thermomechanically processed to obtain enhanced shape-memory characteristics: in particular, dimensional stability upon repeated thermal cycles under constant loads. This is accomplished using severe plastic deformation via equal channel angular extrusion (ECAE) and post-processing annealing heat treatments. The results of the thermomechanical experiments reveal that the processed materials display enhanced shape memory response, exhibiting higher recoverable transformation and reduced irrecoverable strain levels upon thermal cycling compared with the unprocessed material. This improvement is attributed to the increased strength and resistance of the material against defect generation upon phase transformation as a result of the microstructural refinement due to the ECAE process, as supported by the electron microscopy observations. 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

authors

• Atli, Kadri
• Karaman, Ibrahim

published proceedings

• ACTA MATERIALIA

author list (cited authors)

• Atli, K. C., Karaman, I., Noebe, R. D., Garg, A., Chumlyakov, Y. I., & Kireeva, I. V.

citation count

• 66

complete list of authors

• Atli, KC||Karaman, I||Noebe, RD||Garg, A||Chumlyakov, YI||Kireeva, IV

publication date

• July 2011

publisher

• Elsevier  Publisher

published in

• ACTA MATERIALIA  Journal

keywords

• Dimensional Stability
• Equal Channel Angular Extrusion
• High-temperature Shape Memory Alloys
• Martensitic Transformation
• Severe Plastic Deformation

Digital Object Identifier (DOI)

• 10.1016/j.actamat.2011.04.009

start page

• 4747

end page

• 4760

volume

• 59

issue

• 12

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.actamat.2011.04.009