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On the Brittle-to-Ductile Transition of the As-Cast TiVNbTa Refractory High-Entropy Alloy

9 Pages Posted: 12 Oct 2020 Publication Status: Accepted

See all articles by Robert James Scales

Robert James Scales

University of Oxford - Department of Materials

David Edward John Armstrong

University of Oxford - Department of Materials

Angus J. Wilkinson

University of Oxford - Department of Materials

B-S. Li

University of Oxford - Department of Materials

Abstract

The fracture properties of as-cast TiVNbTa, a refractory high-entropy alloy (RHEA), were investigated using four-point bending tests from -139°C to 20°C under a strain-rate of 10-3 s-1. From those tests and fractography, the conditional fracture toughness values and the brittle-to-ductile transition temperature were obtained. The brittle-to-ductile transition temperature was between -47°C to -27°C, which gives an estimated activation energy value of 0.52±0.09 eV for the alloy. This study provides a preliminary understanding of the nature of dislocation motion in a relatively ductile RHEA.

Keywords: High-Entropy Alloys, Refractory Metals, Fracture Toughness, Brittle-to-Ductile Transition, Bending Test, Refractory High-Entropy Alloys

Suggested Citation

Scales, Robert James and Armstrong, David Edward John and Wilkinson, Angus J. and Li, B-S., On the Brittle-to-Ductile Transition of the As-Cast TiVNbTa Refractory High-Entropy Alloy (2020). Available at SSRN: https://ssrn.com/abstract=3708719 or http://dx.doi.org/10.2139/ssrn.3708719

Robert James Scales (Contact Author)

University of Oxford - Department of Materials ( email )

Parks Road
Oxford, OX1 3PH
United Kingdom

David Edward John Armstrong

University of Oxford - Department of Materials ( email )

Parks Road
Oxford, OX1 3PH
United Kingdom

Angus J. Wilkinson

University of Oxford - Department of Materials

Parks Road
Oxford, OX1 3PH
United Kingdom

B-S. Li

University of Oxford - Department of Materials ( email )

Parks Road
Oxford, OX1 3PH
United Kingdom

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