|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Examining the Importance of the ‘Entropic Effect’ on the Mechanical Properties of HEAs
||Ankit Roy, Tomas Babuska, Brandon Krick, Pratik Ray, Ganesh Balasubramanian
|On-Site Speaker (Planned)
HEAs have gained significant attention partly due to the remarkable mechanical properties demonstrated by certain compositions. While an increase in the configurational entropy by incorporating higher number of constituent elements in single-phase FCC HEAs does not guarantee enhanced mechanical properties, the role that the number and choice of elements play remains relatively inconclusive. We examine alloys formed by the binary, ternary, quaternary and quinary equiatomic combinations of refractory Mo-Ta-Ti-W-Zr multi-principal elements for their phase and mechanical properties (Young’s Modulus and Vickers hardness). We find that only a subset of all possible equiatomic compositions form single phase BCC structures, and more intriguingly, the low and medium entropy alloys demonstrate enhanced properties relative to their higher-entropy counterparts. We probe the fundamental causes arising from element selection and the resulting microstructure on the mechanical properties, and understand the dependence of solid-solution hardening on the number and specificity of the elements in these HEAs.