Journal
ACTA MATERIALIA
Volume 58, Issue 12, Pages 4212-4223Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.04.013
Keywords
Ti-Nb; Ti-Nb-Mo; Shape memory alloys; Superelasticity
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Ministry of Education, Science and Technology [R32-2008-000-20093-0]
- National Research Foundation of Korea [R32-2008-000-20093-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mo is added to Ti-Nb alloys in order to enhance their superelasticity. The shape memory properties of Ti-(12-28)Nb-(0-4)Mo alloys are investigated in this paper. The Ti-27Nb, Ti-24Nb-1Mo, Ti-21-Nb-2Mo and Ti-18Nb-3Mo alloys exhibit the most stable superelasticity with a narrow stress hysteresis among Ti-Nb-Mo alloys with Mo contents of 0, 1,2 and 3 at.%, respectively. The ternary alloys reveal better superelasticity due to a higher critical stress for slip deformation and a larger transformation strain. A Ti-15Nb-4Mo alloy heat-treated at 973 K undergoes (2 1 1)< 1 1 1 >-type twinning during tensile testing. Twinning is suppressed in the alloy heat-treated at 923 K due to the precipitation of the a phase, allowing the alloy to deform via a martensitic transformation process. The Ti-15Nb-4Mo alloy exhibits stable superelasticity with a critical stress for slip deformation of 582 MPa and a total recovery strain of 3.5%. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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