Title: Assessing Mg–Sc–(rare earth) ternary phase stability via constituent binary cluster expansions

Journal Article · · Computational Materials Science
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [3]; ORCiD logo [5];  [6];  [3]
  1. Harvey Mudd College, Claremont, CA (United States); OSTI
  2. Harvey Mudd College, Claremont, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. University of New South Wales, Sydney, NSW (Australia)
  4. Boeing Company, Seattle, WA (United States)
  5. Harvey Mudd College, Claremont, CA (United States)
  6. 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

References (30)

Magnesium and its alloys applications in automotive industry journal November 2007
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Light weight materials for automotive applications journal July 1995
The alloy theoretic automated toolkit: A user guide journal December 2002
Development of Mg–Sc–Mn alloys journal April 1999
Superior light metals by texture engineering: Optimized aluminum and magnesium alloys for automotive applications journal February 2013
Physical factors controlling the observed high-strength precipitate morphology in Mg–rare earth alloys journal February 2014
Formation of high-strength β ′ precipitates in Mg–RE alloys: The role of the Mg/ β ″ interfacial instability journal January 2015
A unified description of ordering in HCP Mg-RE alloys journal February 2017
In vitro and in vivo studies of Mg-30Sc alloys with different phase structure for potential usage within bone journal October 2019
Multicomponent multisublattice alloys, nonconfigurational entropy and other additions to the Alloy Theoretic Automated Toolkit journal June 2009
Age-hardening effect by phase transformation of high Sc containing Mg alloy journal December 2015
Determination of α/β phase boundaries and mechanical characterization of Mg-Sc binary alloys journal July 2016
Mechanical properties of Mg-Sc binary alloys under compression journal April 2017
Effect of rare earth additions on microstructure and texture development of magnesium alloy sheets journal October 2010
A high-specific-strength and corrosion-resistant magnesium alloy journal October 2015
Linking electronic structure calculations to generalized stacking fault energies in multicomponent alloys journal June 2020
Self-driven lattice-model Monte Carlo simulations of alloy thermodynamic properties and phase diagrams journal July 2002
Special points for Brillouin-zone integrations journal June 1976
Density-functional theory applied to phase transformations in transition-metal alloys journal April 1983
Coherent-Potential Approximation for a Nonoverlapping-Muffin-Tin-Potential Model of Random Substitutional Alloys journal March 1972
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Guiding the experimental discovery of magnesium alloys journal August 2011
First-principles investigation of phase stability in the Mg-Sc binary alloy journal June 2017
Efficient Ab initio Modeling of Random Multicomponent Alloys journal March 2016
Special quasirandom structures journal July 1990
Generalized Gradient Approximation Made Simple journal October 1996
Elastic and brittle properties of the B2-MgRE (RE = Sc, Y, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er) intermetallics journal November 2007
Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review journal December 2014