Journal
ACTA MATERIALIA
Volume 107, Issue -, Pages 178-195Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.01.031
Keywords
Heusler alloys; Mechanical properties; Elastic properties; Thermal expansion; First-principles calculations
Funding
- Christian Doppler Laboratory for Thermoelectricity
- Austrian Science Fund (FWF) [P28672-N36, P23982-N20]
- Austrian Science Fund (FWF) [P 24380] Funding Source: researchfish
- Austrian Science Fund (FWF) [P24380] Funding Source: Austrian Science Fund (FWF)
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As half-Heusler compounds are promising candidates for environmentally friendly and low-cost thermoelectric materials, not only a high figure of merit and efficiency are necessary but also detailed knowledge of mechanical properties and thermal expansion is compulsory. Although these properties are quite important to evaluate mechanical stability of a thermoelectric device under mechanical stress in a temperature gradient, they have been scarcely reported in the literature. The present article comprises a series of new data of hardness and elastic moduli (in some cases in dependence on composition, density and/or temperature), fracture resistance and thermal expansion, measured with various methods and equipments, as well as a comprehensive compilation of mechanical properties of p- and n-type half-Heusler alloys hitherto available in the literature. Wherever available, experimental data are compared with those from DFT model simulations. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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