Scandium-Based Hexagonal-Closed Packed Multi-Component Alloys
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Since their early development, High-Entropy Alloys have fueled the investigation of exotic metal combinations. Here, we present a strategy for the rational design of a library for multi-component alloys based on six hcp-structured metals. Seven five- and six-component equimolar alloys based on Co, Gd, Y, Sc, Ti and Zr were prepared via induction melting and characterized by PXRD, SEM–EDX and Vickers hardness. They all present ternary hexagonal phases (ScTiZr or GdScY) co-existing with one or more cubic phases and intermetallic compounds. Both ScTiZr and GdScY appear promising as the starting point for new single-phase High-Entropy Alloys families.
Keywords:high-entropy alloys hexagonal close-packed alloys scandium
The authors acknowledge support from the Welsh Government and Higher Education Funding Council for Wales through the Sêr Cymru National Research Network in Advanced Engineering and Materials and by the European Space Agency (contract number 4000111643/NL/PA). KVY is grateful to the EPSRC Impact Acceleration Account for financial support. The authors thank the Materials Advanced Characterisation Centre (MACH1) at Swansea University and the European Synchrotron Radiation Facility (Grenoble, France) for providing measurement time and technical support.
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