Abstract
The viscoelastic nature of bulk metallic glasses (BMGs), their low thermal conductivity, and the fast cooling used in their processing subject them to thermal tempering. This process leads to a residual stress state in which compression on the surface is balanced by tension in the interior. For the first time, we have calculated such stresses in metallic glasses by adapting an analytical instant-freezing model previously developed for silicate glasses. This model has been demonstrated to be reasonably accurate in predicting the final residual stresses, although, due to its very nature, it neglects transient effects. For an infinite plate geometry and employing processing parameters often used for metallic glasses, we predict that significant residual stresses can be generated in these materials during thermal tempering. Preliminary measurements conducted using the layer-removal method yield compressive residual stress values close to model predictions.
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Aydiner, C.C., Ü:Ustü:UndaG, E. & Hanan, J.C. Thermal-tempering analysis of bulk metallic glass plates using an instant-freezing model. Metall Mater Trans A 32, 2709–2715 (2001). https://doi.org/10.1007/s11661-001-1023-8
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DOI: https://doi.org/10.1007/s11661-001-1023-8