SPD powder route for HEA alloy production
Abstract
A comparative study of two fundamentally different concepts for production of high entropy alloys in respect to microstructure and mechanical properties is suggested in this proposal. The suggested non-conventional route is based on combination of mechanical alloying and consolidation of powders via severe plastic deformation (SPD) processing. It is expected to result in attractive nanostructures and new phases with enhanced mechanical properties. The comparison of SPD powder route with conventional molten one is suggested to compare to refractory high-entropy alloys, namely HfNbTaTiZr and HfNbTiZr, produced by vacuum ark melting and subsequently rolled. The powder SPD route will consist of two severe plastic deformation processes with different range of hydrostatic pressure, strain level and temperature. The blend-elemental (BE) powder pre-compact formed under high hydrostatic pressure will be subjected to multiple revolutions of high pressure torsion (HPT) or multiple passes of equal channel angular pressing (ECAP) at temperatures ranging from 20 to 400℃, with the strain level higher than 400% and up to 1000%. The fundamental mechanism of accelerated diffusion and non-equilibrium phase formation under severe plastic deformation and high hydrostatic pressure will be studied. The mechanical properties will be compared in respect to formed nanostructures and phases. The impact of this research is expected in discovery of a novel, energy effective method for HEA production. It is anticipated that HEA made by SPD powder route would have also enhanced mechanical properties compare to the molten route.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 16, 2022
- Source ID
- FA23862114021
Entities
People
- Peter Hodgson
Organizations
- Air Force Office of Scientific Research
- Deakin University
- United States Air Force