Thermodynamic Stabilization of Powder-Route Nanocrystalline Tungsten Alloys
Abstract
This final report summarizes the findings of three years of research on the theory, design, and reduction to practice of nanocrystalline tungsten alloys with nanostructure sufficiently stable to envision a long time-at-temperature powder consolidation cycle. Theoretically, our work to develop the thermodynamics of nanostructured alloy systems presents a new concept to the field of solid-state science: a nanostructured solid solution that can be a ground state for the system. In a design sense, the concept can be used to screen possible alloying elements to down-select to the most promising for detailed study, and in the case of W, we identify Ti as a preferred alloying element for nanostructure stabilization. Experimentally, we have produced a variety of W alloys and evaluated their stability. In the W-Ti system we have verified stability over periods of many days at temperatures up into the consolidation range (~1100 C). Technologically, the combination of theory, design, and proof-of-concept demonstration offers a pathway for future alloy design in cases where nanostructuring is desirable for improved performance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 03, 2013
- Accession Number
- ADA578217
Entities
People
- Christopher A. Schuh
Organizations
- Massachusetts Institute of Technology