Journal
MATERIALS LETTERS
Volume 175, Issue -, Pages 284-287Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2016.03.133
Keywords
Refractory high-entropy alloys; Solid solution strengthening; Mechanical properties; Microstructure; Metals and alloys
Funding
- Ministry of Science and Technology of Taiwan [MOST102-2221 - E-007-047-MY3]
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The crystal structure, microstructure, and mechanical properties of HfMoxNbTaTiZr (x <= 1) alloys were investigated by X-ray diffraction, scanning electron microscopy, and compression testing. All the as solidified HfMoxNbTaTiZr alloys possess a simple body-centered cubic structure. Lattice parameters of the HfMoxNbTaTiZr alloys decrease with an increase in Mo concentration, but the corresponding densities show an opposite trend. The yield strength of the HfMoxNbTaTiZr alloys increases from 1015 MPa to 1512 MPa as x increases from 0 to 1. The solid solution strengthening is linearly proportional to a Mo concentration suggesting that the strengthening effect from each Mo atom is additive. Except for the HfMoNbTaTiZr alloy, HfMoxNbTaTiZr (x < 1) alloys exhibit excellent room-temperature plasticity (> 50%). The material with x=0.75 is a new ductile refractory high-entropy alloy with promising mechanical properties. (c) 2016 Elsevier B.V. All rights reserved.
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