Optimization and validation of a dislocation density based constitutive model for as-cast Mg-9%Al-1%Zn

Dini, Hoda,1984-Jönköping University,JTH, Material och tillverkning,Department of Materials and Manufacturing, School of Engineering, Jönköping University, 551 11 Jönköping, Sweden (författare)

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

TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
Casting methods
Characterization
Magnesium alloy
Optimization
Physically-based model
Plasticity
Aluminum
Aluminum alloys
Constitutive models
Magnesium castings
Microstructure
Plastic flow
Strain rate
Ternary alloys
Zinc
Zinc alloys
Zirconium alloys
Casting method
Dislocation densities
Electron back-scattered diffraction
Model calibration
Physically based modeling
Secondary dendrite arm spacing
Temperature dependent
Tensile stress strain
Magnesium alloys
Material Mechanics

Svoboda, AlesLuleå tekniska universitet,Material- och solidmekanik,Department of Materials and Manufacturing, School of Engineering, Jönköping University, Jönköping, Sweden(Swepub:ltu)svoboda (författare)
Andersson, Nils-EricJönköping University,JTH, Material och tillverkning,Department of Materials and Manufacturing, School of Engineering, Jönköping University, 551 11 Jönköping, Sweden(Swepub:hj)anne (författare)
Ghassemali, Ehsan,1983-Jönköping University,JTH, Material och tillverkning,Department of Materials and Manufacturing, School of Engineering, Jönköping University, 551 11 Jönköping, Sweden(Swepub:hj)GhaEhs (författare)
Lindgren, Lars-ErikLuleå tekniska universitet,Material- och solidmekanik,Division of Mechanics of Solid Materials, Luleå University of Technology, Luleå, Sweden(Swepub:ltu)lel (författare)
Jarfors, Anders E.W.1963-Jönköping University,JTH, Material och tillverkning,Department of Materials and Manufacturing, School of Engineering, Jönköping University, 551 11 Jönköping, Sweden(Swepub:hj)Jarand (författare)
Jönköping UniversityJTH, Material och tillverkning (creator_code:org_t)

Ingår i:Materials Science & Engineering: Elsevier710, s. 17-260921-50931873-4936

Av författaren/redakt...: Dini, Hoda, 1984 ...; Svoboda, Ales; Andersson, Nils- ...; Ghassemali, Ehsa ...; Lindgren, Lars-E ...; Jarfors, Anders ...

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