Metallurgical and Materials Transactions A

, Volume 47, Issue 7, pp 3306–3311 | Cite as

Entropy and Diffuse Scattering: Comparison of NbTiVZr and CrMoNbV

  • Michael Widom
Symposium: High Entropy Alloys III


The chemical disorder intrinsic to high-entropy alloys inevitably creates diffuse scattering in their X-ray or neutron diffraction patterns. Through first principles hybrid Monte Carlo/molecular dynamics simulations of two BCC high-entropy alloy forming compounds, CrMoNbV and NbTiVZr, we identify the contributions of chemical disorder, atomic size, and thermal fluctuations to the diffuse scattering. As a side benefit, we evaluate the reduction in entropy due to pair correlations within the framework of the cluster variation method. Finally, we note that the preference of Ti and Zr for hexagonal structures at low temperature leads to a mechanical instability reducing the local BCC character of NbTiVZr, while preserving global BCC symmetry.


Bragg Peak Near Neighbor Pair Correlation Function Diffuse Scattering Configurational Entropy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



I thank Michael Gao, Marcel Sluiter, Soumyadipta Maiti, and Walter Steurer for useful discussions. This research was supported in part by the Department of Energy Grant DE-SC0014506.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  1. 1.Department of PhysicsCarnegie Mellon UniversityPittsburghUSA

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