Journal
ACTA MATERIALIA
Volume 54, Issue 9, Pages 2419-2429Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2006.01.019
Keywords
shape memory alloys; superelasticity; biomaterials; titanium alloys; precipitation
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Shape memory and superelastic properties associated with the martensitic transformation from beta to alpha martensite were investigated in Ti-(15-35) at.% Nb alloys. The transformation strain and transformation temperature linearly decreased with increasing Nb content. The low critical stress for slip deformation resulted in only a small superelastic strain in solution-treated Ti-Nb binary alloys. Fine and dense omega precipitates formed during aging in the temperature range between 573 and 673 K were effective in increasing the critical stress for slip deformation in a Ti-26 at.% Nb alloy. An intermediate-temperature annealing at 873 K for 600 s without solution treatment was also effective in increasing the critical stress for slip deformation due to the fine subgrain structure. The higher critical stress for slip deformation resulted in a larger recovery strain and stable superelasticity. Excellent superelasticity was achieved by annealing at 873 K for 600 s followed by aging at 573 K due to the combined effect of work hardening and age hardening. (c) 2006 Acta Materialia, Inc. Published by Elsevier Ltd. All rights reserved.
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