Thermal stability and latent heat of Nb-rich martensitic Ti-Nb alloys

Boenisch, Matthias and Panigrahi, Ajit and Calin, Mariana and Waitz, Thomas and Zehetbauer, Michael and Skrotzki, Werner and Eckert, Juergen (2017) Thermal stability and latent heat of Nb-rich martensitic Ti-Nb alloys. In: JOURNAL OF ALLOYS AND COMPOUNDS, 697 . pp. 300-309.

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Abstract

Ti-Nb-based alloys are candidate materials for load-bearing and for functional biomedical implant components. For these applications alloy compositions with relatively low martensitic transformation (MT) temperatures are of highest interest. In this work we examine the thermal stability and the temperature-induced beta <->alpha `' MT of Nb-rich martensitic and partially martensitic Ti-Nb alloys exhibiting martensite start temperatures M-s < 300 degrees C. The first part of this article investigates the phase transformations and precipitation reactions occurring during isochronal cycling in dependence of the Nb content using differential scanning calorimetry and dilatometry in combination with X-ray diffraction. The second part studies the temperatures, thermal hysteresis and transformation interval of the beta <->alpha `' MT. The latent heat, elastic and irreversible energy contributions of the thermoelastic energy balance are quantified in dependence of Nb content in the remaining parts. All energy contributions decrease with increasing Nb content and the latent heat becomes very small (< 5 J/g) for the Nb-richest martensitic compositions. Above a critical Nb concentration the beta <->alpha `' MT is incomplete. (C) 2016 Elsevier B. V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF ALLOYS AND COMPOUNDS
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	10 Feb 2017 09:11
Last Modified:	10 Feb 2017 09:11
URI:	http://eprints.iisc.ac.in/id/eprint/56207

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