Journal
SCRIPTA MATERIALIA
Volume 194, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.113674
Keywords
High-entropy alloy; Intermetallic compound; Thermal stability; Mechanical property; Phase formation
Categories
Funding
- National Natural Science Foundation of China [51601086, 51971106]
- UMass Faculty Startup
- Liaoning Revitalization Programs for Innovative Groups and Distinguished Professors
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This study successfully developed a series of high-entropy intermetallic compounds (HEICs) with exceptional high-temperature phase stability and ultrahigh compressive strength. The mechanism underlying phase formation of HEICs was revealed by combining electronegativity-related parameters and atomic size dispersity.
The current research of high-entropy alloys (HEAs) is mainly focused on simple solid-solution alloys or alloys with precipitation strengthening phases. In the present work, we developed a series of high-entropy intermetallic compounds (HEICs). In particular, the multi-principal element Fe0.75Co0.75Ni0.75Cu0.75TiZrHf with B2 ordering shows an ultrahigh compressive yield strength of 2.25 GPa and a fracture strength of 2.52 GPa. The developed HEIC also demonstrates exceptional high-temperature phase stability with retained yield strengths up to 905 MPa and 705 MPa at 800 degrees C and 900 degrees C, respectively. The underlying phase formation rule of the HEICs is discussed within the framework of a proposed electronegativity related parameter combined with the atomic size dispersity. Our study broadens the family of high-entropy materials and provides a new perspective for the high-temperature alloy design based on multi-principal element intermetallics. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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