First-principles study of the solute segregation in twin boundaries in Mg and possible descriptors for mechanical properties
Twin boundaries play an important role in shaping the mechanical properties of Mg and Mg alloys. In this study, we simulate the segregation energies (SEs) of 23 solutes in the profuse and twin boundaries in Mg. Almost all solutes have both negative and positive SEs (except Tl), which indicate these solutes prefer to segregate at half of the sites in the twin boundaries. The correlation between the signs of SEs and the solute sites is a strong indication for the importance of the volumetric effects, which is confirmed by our modeling based on Voronoi volume calculations. In order to quantitatively describe the solute segregation, solute coverages of the two twin boundaries are calculated using the Langmuir-McLean model. Convergence tests are performed in order to obtain accurate solute coverages. The converged solute coverages are employed as descriptors for the solute strengthening through twin boundaries. Finally, we show two “treasure maps” for the materials design based on descriptors originated from solute solution effects at twin boundaries and stacking faults.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1547882
- Alternate ID(s):
- OSTI ID: 1542202
- Journal Information:
- Materials & Design, Journal Name: Materials & Design Vol. 165 Journal Issue: C; ISSN 0264-1275
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
Similar Records
Elastic Antiproton-Nucleus Scattering from Chiral Forces
Measurement of in with decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data