Role of severe plastic deformation on the cyclic reversibility of a Ti50.3Ni33.7Pd16 high temperature shape memory alloy

abstract

• The present work focuses on the effect of microstructural refinement on the thermo-mechanical cyclic stability of a Ti50.3Ni 33.7Pd16 high temperature shape memory alloy (HTSMA) which was severe plastically deformed using equal channel angular extrusion (ECAE). The grain/subgrain size of the high temperature austenite phase was refined down to about 100 nm, the lowest reported to date in HTSMAs. The increase in strength differential between the onset of transformation and the macroscopic plastic yielding after ECAE led to a notable enhancement in the cyclic stability during isobaric cooling-heating experiments. The reduction in irrecoverable strain levels was attributed to the increase in critical stress for dislocation slip due to the microstructural refinement during the ECAE process. 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

authors

• Atli, Kadri
• Karaman, Ibrahim

published proceedings

• ACTA MATERIALIA

author list (cited authors)

• Kockar, B., Atli, K. C., Ma, J., Haouaoui, M., Karaman, I., Nagasako, M., & Kainuma, R.

citation count

• 65

complete list of authors

• Kockar, B||Atli, KC||Ma, J||Haouaoui, M||Karaman, I||Nagasako, M||Kainuma, R

publication date

• November 2010

publisher

• Elsevier  Publisher

published in

• ACTA MATERIALIA  Journal

keywords

• Equal Channel Angular Extrusion
• Equal Channel Angular Pressing
• High Temperature Shape Memory Alloys
• Severe Plastic Deformation
• TiNiPd

Digital Object Identifier (DOI)

• 10.1016/j.actamat.2010.08.003

start page

• 6411

end page

• 6420

volume

• 58

issue

• 19

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.actamat.2010.08.003