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Esteban Manzanares, Gustavo, Ma, Anxin, Papadimitriou, Ioannis, Martínez Sáez, Enrique and Llorca Martinez, Francisco Javier (2019). Basal Dislocation/Precipitate Interactions in Mg-Al Alloys: an Atomistic Investigation. "Modelling and Simulation in Materials Science and Engineering", v. 27 (n. 7); pp.. ISSN 1361-651X. https://doi.org/10.1088/1361-651X/ab2de0.
Title: | Basal Dislocation/Precipitate Interactions in Mg-Al Alloys: an Atomistic Investigation |
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Author/s: |
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Item Type: | Article |
Título de Revista/Publicación: | Modelling and Simulation in Materials Science and Engineering |
Date: | 18 July 2019 |
ISSN: | 1361-651X |
Volume: | 27 |
Subjects: | |
Freetext Keywords: | Atomistic Simulations, Mg–Al Alloys, Dislocation/Precipitate Interactions, Precipitation Hardening |
Faculty: | E.T.S.I. Caminos, Canales y Puertos (UPM) |
Department: | Ciencia de los Materiales |
Creative Commons Licenses: | Recognition - No derivative works - Non commercial |
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The interaction between edge basal dislocations and β-Mg17Al12 precipitates was studied using atomistic simulations. A strategy was developed to insert a lozenge-shaped Mg17Al12 precipitate with Burgers orientation relationship within the Mg matrix in an atomistic model ensuring that the matrix/precipitate interfaces were close to minimum energy configurations. It was found that the dislocation bypassed the precipitate by the formation of an Orowan loop that entered the precipitate. Within the precipitate, the dislocation was not able to progress further until more dislocations overcome the precipitate and push the initial loop to shear the precipitate along the (110) plane, parallel to the basal plane of Mg. This process was eventually repeated as more dislocations overcome the precipitate and this mechanism of dislocation/precipitate interaction was in agreement with experimental observations. Moreover, the initial resolved shear stress to bypass the precipitate was in agreement with the predictions of the Bacon–Kocks–Scattergood model.
Item ID: | 55900 |
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DC Identifier: | https://oa.upm.es/55900/ |
OAI Identifier: | oai:oa.upm.es:55900 |
DOI: | 10.1088/1361-651X/ab2de0 |
Official URL: | https://iopscience.iop.org/nsearch?terms=basal+dis... |
Deposited by: | Memoria Investigacion |
Deposited on: | 29 Aug 2019 07:18 |
Last Modified: | 23 Nov 2022 12:17 |