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Anti-phase boundary energy of β series precipitates in Mg-Y-Nd system.
- Source :
-
Scripta Materialia . Mar2021, Vol. 193, p127-131. 5p. - Publication Year :
- 2021
-
Abstract
- Anti-phase boundary energy (APBE) is a vital contributing factor for the dislocation shearing mechanism which operates in Mg-RE alloys. To clarify the structure and composition dependence of APBE and provide the guidance for strength improvement of Mg alloys, the formation energy, misfit strain, and APBE of β series precipitates in Mg-Y-Nd system are investigated by first-principles calculations. The atomic occupations of ternary precipitates are determined based on misfit strains. The APBEs of β p ″ ′ phases are higher than that of β s ′ , and precipitates in Mg-Nd system possess higher APBEs than their counterparts in Mg-Y system. The higher APBEs enable larger strength increments of precipitates in Mg-Nd system than Mg-Y system when the amount of Y and Nd are the same. However, when both elements reach their solubility limit, the large amount of Y makes up the low APBE and achieves superior strength increment than the precipitates in Mg-Nd system. Image, graphical abstract [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANTIPHASE boundaries
*MAGNESIUM alloys
Subjects
Details
- Language :
- English
- ISSN :
- 13596462
- Volume :
- 193
- Database :
- Academic Search Index
- Journal :
- Scripta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 147044854
- Full Text :
- https://doi.org/10.1016/j.scriptamat.2020.11.004