Evolution of microstructure, hardness, and corrosion properties of high-entropy Al0.5CoCrFeNi alloy

High-Entropy Alloys: A Critical Review

“…Of all the HEA systems reported, Al-Co-Cr-Cu-Fe-Ni [7,8,21,35,36,49,[60][61][62][63][64][65][66][67][68] and its Cu-free version Al-Co-Cr-Fe-Ni [69][70][71][72][73][74] have been studied most comprehensively. Most of the reported HEA systems emerge from them.…”

“…[20,73,[109][110][111][112][113][114][115][116][117][118][119][120][121] In both solutions, some HEAs show better corrosion properties than 304 SS and even 304L SS and have good resistance to pitting. [109,[115][116][117] Important factors include alloy composition and microstructure, particularly the amount and distribution of corrosion-resistant elements (such as Cr), and the presence of galvanic corrosion.…”

“…[118] Addition of 0.5 mole fraction of Al to the CoCrFeNi alloy leads to the formation of (Al, Ni)-rich BCC phase and causes galvanic corrosion in NaCl solution. [73] Al is also detrimental to the corrosion resistance of the Al x CrFe 1.5 MnNi 0.5 alloys. Addition of Al significantly reduces the pitting potential and increases the area of localized/pitting corrosion of these alloys in NaCl solution.…”

“…HEA coatings/claddings can also be prepared by sputtering or other cladding techniques. [22,23,73,[133][134][135][136][137][138][139][140] In terms of the phase and crystal structure of HEAs, most of our knowledge is based on the as-cast state (after vacuum arc melting). Very little is known about the equilibrium phases and phase diagrams, but these are key to the design and development of HEAs.…”

Local Structure and Short-Range Order in a NiCoCr Solid Solution Alloy

“…As a new class of materials, these compositionally complex alloys have attracted a large number of research interests over the past decade, leading to the discovery of some excellent mechanical properties and interesting physical properties [3][4][5][6][7][8][9][10]. Recently, many multicomponent solid solution alloys with 3d transition elements from Cr to Ni in the periodic table, which have similar atomic size, have been synthesized and all of these Ni-based alloys have a simple face-centered cubic (fcc) structure [10][11][12][13][14].…”