Multiphase Refractory Multiprincipal Element Alloys
Abstract
Metallic materials are foundational components in a vast array of naval systems, including Metallic materials are foundational compo,nents in a vast array of naval systems, including ships,-submarines, sea-based aircraft and hypersonic vehicles. Recently, multi-pri,ncipal element (MPE)-alloys have emerged as a promising new class of advanced metallic materials. With five or more-elements present, in non-dilute quantities, exceptional properties (strength, toughness,-magnetization, creep resistance) have been observed. To date,, properties of refractory MPEs have-been investigated mostly in small quantities of material, far from optimized compositionally or,-structurally. Additionally, typically only a small subset of properties (e.g. room temperature-compressive ductility and yield stre,ngth) have been investigated for most MPE alloys, in spite of the-fact that the vast majority of structural applications require a b,alanced set of properties.-The overarching goal of the proposed research program is to identify promising compositional-spaces for t,he development of refractory MPE structural alloys with balanced properties. This-program will build upon the foundational tools and, understanding developed in the UCSB-led ONR-BRC MPE.EDU program on refractory multiprincipal element alloys and will benefit from-c,ollaborations with three ongoing ONR individual P.I. programs at UCSB (Beyerlein), Colorado School-of Mines (Clarke) and Johns Hopki,ns (Hemker), as well with as the Johns Hopkins MURI (Taheri).-The proposed research effort aims to design multiphase materials compr,ised of a ductile MPE matrix-strengthened with intermetallic phases that are stable beyond temperatures of 1200C. Tools and-design, methodologies developed in the ONR BRC program, including the MPE database, machine-learning algorithms, phase field dislocation dy,namics simulations, splat quenching and high-resolution digital image correlation will be integrated for assessments of promising co,mposition-property spaces. New alloy design strategies to introduce intermetallic phases will be developed.-Favorable compositions i,dentified with rapid screening tools will be fabricated into larger volumes-by arc melting to assess slip characteristics and high t,emperature strength. The most promising-one or two compositions will be processed by thermomechanical approaches being developed at-,Colorado School of Mines. The fabricated material will them be used to assess fatigue properties-at UCSB and high temperature creep, and oxidation at JHU.-Anticipated outcomes of the research include: (i) new insights on phase equilibria and the intrinsic-plastic, deformation mechanisms that result in unique properties in refractory MPEs (ii) continued-development of the MPE database and accom,panying machine learning and experimental high-throughput screening approaches, (iii) new information on a larger suite of refractor,y MPE-properties and (iv) future alloy design approaches for MPEs that will result in a balance of-properties relevant to the naval, community and its suppliers for this important emerging class of-materials.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 16, 2022
- Source ID
- N000142212087
Entities
People
- Tresa M. Pollock
Organizations
- Office of Naval Research
- United States Navy
- University of California, Santa Barbara