Recent Progress in Alloy Designs for High-Entropy Crystalline and Glassy Alloys

Abstract

This paper provides general overviews for the recent progress in alloy designs for high-entropy crystalline and glassy alloys in the following aspects. First, the alloy designs for bulk metallic glasses (BMGs) are briefly reviewed by focusing on atomic size differences, mixing enthalpy and valence electron concentration as well, followed by their extension to the other related alloys including high-entropy alloys (HEAs). Then, the historic backgrounds of the high-entropy bulk metallic glasses (HE-BMGs) are dealt with by pointing out the features of the HE-BMGs. Subsequently, the recently-developed HEAs with hcp structure, which are the new ones to the conventional HEAs with bcc, fcc and their mixture structures, are discussed for their future development. Finally, recent alloy designs utilizing crystallographic data acquired from Pettifor map, Pearson's Crystal Data and binary phase diagrams are discussed in order to use them for the development of new alloys in near future.

Liquid Phase Separation in Ag-Co-Cr-Fe-Mn-Ni, Co Cr-Cu-Fe-Mn-Ni and Co-Cr-Cu-Fe-Mn-Ni-B High Entropy Alloys for Biomedical Application

“…Examples of these are ASTM F753, ASTM F1537, and JIS T 7402 alloys. High-entropy alloys (HEAs) have evolved as a new category of structural and functional materials [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Co-Cr-Mo-based HEAs of Ag-Co-Cr-Fe-Mn-Mo-W HEAs [23] were developed from Co-Cr-Mo metallic biomaterials, and the single solid solution formation for the development of Co-Cr-based HEAs for metallic biomaterials (BioHEAs) was prevented by the σ phase formation and the occurrence of LPS.…”