University

Defect structure in plastically deformed high-entropy alloys

“…These alloys are currently a focus of materials science due to their outstanding properties, such as high hardness and strength [3][4][5][6], good resistance to thermal softening [7][8][9][10], good corrosion resistance [11], outstanding wear and fatigue properties [12,13]. The first results on multi-component [1] and highentropy alloys [2] were published in 2004, but the background work started much earlier [14][15][16]. It is not so easy to give a clear definition of HEAs.…”

From High‐Entropy Alloys to High‐Entropy Steels

“…Multi‐component alloys which are also referred to as high‐entropy alloys represent a class of metallic materials containing typically five or more principal alloying elements in equiatomic or near equiatomic proportions. While early efforts in this direction were inspired from recipe guidelines devised originally for metallic glasses, the current work in this field aims at designing crystalline entropy‐stabilized massive solid solution phases of equiatomic composition.…”

“…While early efforts in this direction were inspired from recipe guidelines devised originally for metallic glasses, the current work in this field aims at designing crystalline entropy‐stabilized massive solid solution phases of equiatomic composition. The concepts of designing such compositionally complex solid solutions were introduced and further developed by the groups of Cantor, Ranganathan, and Yeh …”

Transformations in CoCrCuFeNi MPEA thin films during in-situ annealing in TEM

“…Vincent [3] pointed out the known thermodynamic fact that configurational entropy conf S ∆ of an alloy can be high enough to overcome the formation of intermetallic phases resulting in stable solid solution. After this, Peter Knight [4] in Oxford in 1998, achieved similar result and subsequently, Cantor et al [5] prepared and designed an equimolar Sixteen years have passed since these fundamental papers. High Entropy Alloys (HEAs) which is also called Multi-Principal Element Alloys (MPEAs) have become new class of metallic material with a potential use for structural applications and popular fields in metallurgy.…”

“…However, most recent findings within the last few years [29][30][31][32][33][34][35][36][37] suggested that diffusion in MPEAs cannot be always considered as sluggish [27,38] and configurational entropy does not directly lead to reduced diffusion [39]. In some bulk MPEAs, for example Al0.5CoCrCuFeNi the concurrence of rapid nucleation of nano-phases and spinodal decomposition [1][2][3][4][5][6] took place in the as-solidified as well in the annealed stage [35][36][37].…”