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Optimization and validation of a dislocation density based constitutive model for as-cast Mg-9%Al-1%Zn
Department of Materials and Manufacturing, School of Engineering, Jönköping University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Department of Materials and Manufacturing, School of Engineering, Jönköping University.
Department of Materials and Manufacturing, School of Engineering, Jönköping University.
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2018 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 710, 17-26 p.Article in journal (Refereed) Published
Abstract [en]

A dislocation density-based constitutive model, including effects of microstructure scale and temperature, was calibrated to predict flow stress of an as-cast AZ91D (Mg-9%Al-1%Zn) alloy. Tensile stress-strain data, for strain rates from 10-4 up to 10-1 s-1 and temperatures from room temperature up to 190 °C were used for model calibration. The used model accounts for the interaction of various microstructure features with dislocations and thereby on the plastic properties. It was shown that the Secondary Dendrite Arm Spacing (SDAS) size was appropriate as an initial characteristic microstructural scale input to the model. However, as strain increased the influence of subcells size and total dislocation density dominated the flow stress. The calibrated temperature-dependent parameters were validated through a correlation between microstructure and the physics of the deforming alloy. The model was validated by comparison with dislocation density obtained by using Electron Backscattered Diffraction (EBSD) technique.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 710, 17-26 p.
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-66390DOI: 10.1016/j.msea.2017.10.081Scopus ID: 2-s2.0-85032297009OAI: oai:DiVA.org:ltu-66390DiVA: diva2:1154905
Note

Validerad;2017;Nivå 2;2017-11-06 (andbra)

Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-24Bibliographically approved

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CiteExportLink to record
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