Study on the Internal Stress and Thermal Anisotropy in Magnesium Alloys Using a Thermal Elastic Viscoplastic Self-Consistent Model.A thermal elastic viscoplastic self-consistent model is utilized to examine the thermal stress induced by the thermal anisotropy of single crystals during heat treatments.  This model considers temperature-dependent elastic constants and critical resolved shear stress associated with thermal dilation.  Polycrystals offer more deformation mechanisms to accommodate thermal anisotropy compared to single crystals, resulting in lower applied stress at the constrained boundary.  Lower thermal anisotropy in the entire polycrystal structure leads to reduced internal stress. 
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