Assessing Mg–Sc–(rare earth) ternary phase stability via constituent binary cluster expansions
- Harvey Mudd College, Claremont, CA (United States); OSTI
- Harvey Mudd College, Claremont, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
- University of New South Wales, Sydney, NSW (Australia)
- Boeing Company, Seattle, WA (United States)
- Harvey Mudd College, Claremont, CA (United States)
- University of California, Merced, CA (United States)
The disordered Mg–Sc body-centered cubic (bcc) phase is both lightweight and strong; however, the system is impractical for general industrial use due to the high cost of scandium. Here we propose a computationally efficient metric that assesses ternary rare earth element additions that may stabilize the bcc phase at lower Sc concentrations. We find that the bcc phase is stabilized by the ternary addition of Y or Er, but not by La, Ce, or Nd, and we validate these predictions by experimental production and characterization of Mg–Sc–(Y,Er,Nd) alloys. The results suggest a computationally efficient method to anticipate integration of ternary elements into binary systems using cluster expansions of constituent binaries.
- Research Organization:
- Harvey Mudd College, Claremont, CA (United States); University of California, Merced, CA (United States)
- Sponsoring Organization:
- Jude and Eileen Laspa Fellowship; National Science Foundation (NSF); USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0019053
- OSTI ID:
- 1977002
- Journal Information:
- Computational Materials Science, Journal Name: Computational Materials Science Journal Issue: C Vol. 207; ISSN 0927-0256
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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