Basal Dislocation/Precipitate Interactions in Mg-Al Alloys: an Atomistic Investigation

Esteban Manzanares, Gustavo and Ma, Anxin and Papadimitriou, Ioannis and 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.

Description

Title: Basal Dislocation/Precipitate Interactions in Mg-Al Alloys: an Atomistic Investigation
Author/s:
  • Esteban Manzanares, Gustavo
  • Ma, Anxin
  • Papadimitriou, Ioannis
  • Martínez Sáez, Enrique
  • Llorca Martinez, Francisco Javier
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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Abstract

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.

Funding Projects

TypeCodeAcronymLeaderTitle
Horizon 2020669141VIRMETALINSTITUTO IMDEA MATERIALESVirtual Design, Virtual Processing and Virtual Testing of Metallic Materials

More information

Item ID: 55900
DC Identifier: http://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+dislocation%2Fprecipitate
Deposited by: Memoria Investigacion
Deposited on: 29 Aug 2019 07:18
Last Modified: 18 Jul 2020 22:30
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