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Thermomechanical modelling of polysynthetically twinned TiAl crystals
Citation Link: https://doi.org/10.15480/882.3000
Publikationstyp
Journal Article
Date Issued
2015-08-14
Sprache
English
Author(s)
TORE-DOI
TORE-URI
Journal
Volume
95
Issue
24
Start Page
2607
End Page
2626
Citation
Philosophical Magazine 24 (95): 2607-2626 (2015)
Publisher DOI
Scopus ID
Publisher
Taylor & Francis
In the present paper, a thermomechanically coupled hyperelastic-plastic model is set up to predict the yield stress of polysynthetically twinned TiAl crystals as a function of temperature, load angle, α<inf>2</inf> content, lamellar thickness and domain size. The elastic deformation is modelled in terms of the Helmholtz free energy density, and the deformation in the plastic regime is mapped by crystal plasticity theory. The yield stress temperature anomaly of intermetallics is incorporated in the model via the critical resolved shear stresses. The numerical results show a very good agreement with experimental results for a wide range of microstructural parameters and temperatures.
Subjects
crystal plasticity
intermetallics
polysynthetically twinned crystal
temperature anomaly
thermomechanical modelling
TiAl
titanium aluminides
DDC Class
620: Ingenieurwissenschaften
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