Journal
RARE METALS
Volume 38, Issue 10, Pages 965-970Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-019-01305-3
Keywords
Ti-Zr alloys; Martensitic transformation; Shape memory effect; Superelasticity
Funding
- National Key R&D Program of China [2018YFC1106600]
- Industrial Transformation and Upgrading of Strong Base Project of China [TC150B5C0/03]
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Martensitic transformations, mechanical properties, shape memory effect and superelasticity of Ti-xZr-(30-x)Nb-4Ta (x = 15, 16, 17 and 18; at%) alloys were investigated. X-ray diffraction (XRD), optical microscopy (OM) and transmission electron microscopy (TEM) results indicated that the Ti-16Zr-14Nb-4Ta, Ti-17Zr-13Nb-4Ta and Ti-18Zr-12Nb-4Ta alloys were mainly composed of alpha ''-martensite, while the Ti-15Zr-15Nb-4Ta alloy was characterized by predominant beta phase. The reverse martensitic transformation temperatures increased when Nb was replaced by Zr, indicating stronger beta-stabilizing effect for the former. The Ti-15Zr-15Nb-4Ta alloy displayed superelasticity during tensile deformation with a recovery strain of 3.51%. For the other three alloys with higher Zr content, the martensitic reorientation occurred during tensile deformation, resulting in shape memory recovery upon subsequent heating. The maximum shape memory effect was 3.46% in the Ti-18Zr-12Nb-4Ta alloy.
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