Solid Solution Formation Criteria for High Entropy Alloys

Abstract

The solid solution formation criteria for the equi-atomic ratio alloys were discussed. It is found that higher entropy of mixing (Smix>1.61R), less atomic size difference (δ<4.6), and near zero of the absolute value of the enthalpy of mixing (-2.685δ-2.54<Hmix <-1.28δ+5.44 KJ/mol) facilitate the formation of solid solution for the multi-principle components equi-atomic alloys.

Atomic short-range order and incipient long-range order in high-entropy alloys

“…For the reader's convenience, we define a parameter (in mole fraction) that controls the Al concentration in Al /5 [CoCrFeNi] 1− /5 . Similar to Chou et al [52] and Zhang et al [50], we focused our attention to three regions: (1) an Al-poor region for < 0.5 with the A1 phase; (2) an Al-intermediate region for 0.5 < 1.25, which exhibits a mixed A1 + A2 phase; and (3) an Al-rich region for 1. 25 2.0 with the A2 phase [53,54].…”

Determination of the transition to the high entropy regime for alloys of refractory elements

“…Experimental studies also include the role of constituents or alloying additions on properties [22][23][24][25][26][27][28][29][30][31][32][33][34][35]. However, relative to the extensive experimental work, theoretical work is somewhat lacking, limited to an analysis of the concepts and conditions underlying the field of HEA [36][37][38]. Yeh et al [36] provided a novel way to classify alloys based on their number of constituents and the role played by the entropy of mixing.…”

Equilibrium phase of high-entropy FeCoNiCrCu0.5 alloy at elevated temperature

“…Alloy systems that are composed of at least five principal elements at 5-35 at% have been reported [4][5][6][7][8][9]. Highentropy alloy contains no single matrix element.…”

“…Solid solutions with multiprincipal elements have been found to be more stable intermetallic compounds (IMC) at various temperatures. Since they have large entropies of mixing, IMC nano-precipitates easily form in the as-cast state [3,[5][6][7]. Since they have excellent high-temperature behavior, mechanical behavior, and corrosion resistance, high-entropy alloys are promising materials for industrial applications [8][9][10][11][12][13][14].…”