About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
Theoretical and Numerical Study to Model the Effect of Dynamic Strain Aging in the HfNbTaTiZr Refractory High-Entropy Alloy |
| Author(s) |
Yooseob Song, Shuying Chen, Weidong Li, Ko-Kai Tseng, Jien-Wei Yeh, Peter K. Liaw |
| On-Site Speaker (Planned) |
Yooseob Song |
| Abstract Scope |
The goal of this work is to systemically investigate the mechanics of refractory high-entropy alloys in terms of experimental, theoretical, and numerical approaches with a focus on dynamic strain aging. Single-phase body-centered-cubic HfNbTaTiZr refractory high-entropy alloys are tested in a wide range of temperatures to demonstrate the presence of dynamic strain aging. A new constitutive model is developed, considering several strengthening mechanisms including lattice distortion and dynamic strain aging. Correspondingly, the finite element algorithm for the developed model is presented via a user-defined subroutine. The findings of the present work suggest that a stress component for describing the effect of dynamic strain aging needs to be incorporated in the model as a function of the equivalent plastic strain, equivalent plastic strain rate, and temperature since its occurrence and characteristics depend on those factors. |