Nanostructured High Entropy Alloys
Abstract
The technical objective of the proposed effort is to establish design principles for structurally efficient nanostructured high entropy alloys with engineered phases and microstructures enabling strength and ductility values that exceed those of conventionally processed alloys. The proposed effort is motivated by the opportunity to synthesize nanostructured high entropy alloys (HEAs) that are thermally stable and mechanically strong with good ductility. The proposed research seeks to dramatically alter HEA synthesis and uncover new design pathways that are based on fundamental knowledge of the underlying phenomena, rather than on trial and error approaches. More specifically, the technical approach is organized into three primary thrusts. First, the research will seek to apply severe plastic deformation techniques to ingot HEAs prepared by arc melting and casting. Second, the proposed work will investigate mechanical and physical behavior of not only macroscopic samples, but also in-situ deformation and indentation techniques, to provide mechanistic information related to defect characteristics (e.g., dislocation density and grain boundary characteristics). Third, the proposed effort will utilize advanced characterization techniques to understand microstructural characteristics in nanostructured HEAs. The microstructural factors that affect the thermal stability of nanostructured HEAs will be established, paying special attention to the influence of defects on phase transformations, grain and GB structures, and precipitates. The proposed effort will use the AlCoCrCuFeNi system as a model material system, due in large part to the availability of most chemical and physical data needed for the analyses.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1610269
Entities
People
- Enrique J. Lavernia
Organizations
- Army Contracting Command
- United States Army
- University of California, Irvine