By Michael C. Gao, Jien-Wei Yeh, Peter K. Liaw, Yong Zhang

This ebook offers a scientific and accomplished description of high-entropy alloys (HEAs). The authors summarize key houses of HEAs from the point of view of either basic figuring out and functions, that are supported by means of in-depth analyses. The e-book additionally comprises computational modeling in tackling HEAs, which support elucidate the formation mechanisms and homes of HEAs from a variety of size and time scales.

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The phase stability dependence on the electron concentration needs to be further understood along with the discovery of new HEAs containing different phase constitutions. 4 On e/a The difference between VEC and e/a, in terms of both definitions and applications, has been discussed (more details in Ref. [42]). Due to the difficulty in defining the e/a values for TM elements, the use of VEC is more convenient for predicting the phase selection in HEAs. However, based on the historical contribution of e/a to understand the phase stability in alloys, efforts to study the effect of e/a on the phase stability in HEAs are still necessary.

4 replaces δ in Fig. 3 by the number of elements, N. It can be seen that solid solution forming HEAs appear at higher Ω and larger N, while BMGs appear at lower Ω and smaller N. 2 Phase Formation Rules 35 Solid Solutions (S) Intermetallics (I) S+I BMGs (B) 100 W S 10 S+ I I 1 B 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 d (%) Fig. 3 Phase selection diagram of HEAs and BMGs based on Ω and δ [16] Fig. 3 Electron Concentration HEAs with solid solution structures are generally desired, since most, if not all, advantageous features like high hardness [1], sluggish diffusion kinetics [35], and high-temperature softening resistance [36] are related to the multi-principalelement solid solution structures.

3 % hexagonality. VEC of Co3V can be increased by partial replacement of Co by Ni: (Ni, Co)3V. 54. 75, when Ni completely replaces Co, results in a change in the basic layer structure from triangular (T) type to rectangular (R) type, and stacking of the R layers gives a tetragonal ordered structure similar to DO22-type Ni3V. 25 Ordered cubic Fig. 7 Effect of the electron concentration (VEC) on the stability of ordered crystal structures in Ni3V-Co3V-Fe3V alloys [43] partial replacement of Co by Fe: (Co, Fe)3V.

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