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Effects of Substitutional Tantalum on the Monotectoid Transition in the Niobium-Hydrogen System

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Abstract

Changes to the monotectoid transition in the niobium-hydrogen system due to the substitution of modest amounts of niobium with tantalum have been assessed via differential scanning calorimetry. Specimens of the alloy-hydrogen system, of varying hydrogen content, were analyzed over the temperature range from 323 to 398 K. From differential scanning calorimetric analysis, the phase transition temperature and the energy change due to the phase transition were quantified. The results show that the presence of tantalum significantly alters both the temperature and compositional characteristics of the monotectoid equilibrium. Relative to the niobium-hydrogen system, tantalum caused a decrease to the monotectoid transition temperature and a decrease in the width of the monotectoid horizontal boundary.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Lafayette College, Easton, PA, 18042, USA

    Steve Nesbit

  2. College of Engineering, Phoenicia University, Zahrani, Lebanon

    Karim Rebeiz

  3. Department of Chemistry, University of Hartford, West Hartford, CT, 06117, USA

    Andrew Craft

Authors
  1. Steve Nesbit
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  2. Karim Rebeiz
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  3. Andrew Craft
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Correspondence to Andrew Craft.

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Nesbit, S., Rebeiz, K. & Craft, A. Effects of Substitutional Tantalum on the Monotectoid Transition in the Niobium-Hydrogen System. J. Phase Equilib. Diffus. 40, 553–560 (2019). https://doi.org/10.1007/s11669-019-00741-z

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  • DOI: https://doi.org/10.1007/s11669-019-00741-z

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