Sliding Friction and Wear Behavior of High Entropy Alloys at Room and Elevated Temperatures Page: 25
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where VEC is for individual element given in table 2.1 [17]. An example calculation of
VEC is as follows [18]:
11x5+12x8 151
VEC 13 13
VECCu~A1 ~ llx9+3x4 1 -85
(VEC(Cu, {4=r 9+ 4= =8.54
13 13
Guo classified the phases formation into three criteria as follows:
1. At VEC > 8, only FCC phase forms.
2. At VEC 6.87, only BCC phase forms.
3. At 6.875VEC<8, both FCC and BCC phases present together.
Guo's proposal is applicable for most HEA systems. It was found that the elements
employed in the alloy have nearly identical atomic radii. The VEC will be the decisive
factor in determining the phase stability in HEAs. In addition, Guo pointed to two issues
to be taken into consideration. First, the ranges of VEC for several phases may be
overlapped, and this relies on the alloy components. Second, the phases for alloys in the
as-cast case can be considered as metastable phases and not in thermodynamic
equilibrium [17].
Table 2.1. Physiochemical properties for commonly elements employed in HEAs systems
[17].
Element Atomic Radius (A) Electronegativity VEC
Al 1.432 1.61 3
B 0.820 2.04 325
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Kadhim, Dheyaa. Sliding Friction and Wear Behavior of High Entropy Alloys at Room and Elevated Temperatures, thesis, December 2016; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc955078/m1/39/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .