Abstract
We report activation volume measurements of Zr-based Bulk Metallic Glasses (BMGs) through nanoindentation tests. Monotonic and cyclic nanoindentation loadings are carried out at rates ranging from 250 to 2500 µN/s and at ambient temperature. The quantitative analysis of the activation volume parameter is determined using depth variation at constant load. In particular, the effect of loading rates on the activation volume of metallic glass is studied. Under quasi-static cyclic loading, series of measurement revealed that activation volume depending on the number of cycles and the loading rates. Indeed, a significant increase in the order of 96% of activation volume at 250 µN/s is determined. Furthermore, a quantitative analysis in terms of the plastic yield criterion for improving the identification of the shear band initiation key parameter in the BMGs is developed. Both the Von Mises and Mohr Coulomb constitutive description of plastic yield criterion were used in the calculation of the activation volume parameter. The numerical results based on Mohr Coulomb criterion are three to four times higher than the Von Mises criterion.
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Acknowledgements
This work was supported by the CMCU_Hubert Curien program, Award no. 08G1122. The authors also gratefully acknowledge Professor Y. Yokoyama, from Himeji Institute of Technology, Shosha Japan for providing some samples used in this study.
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Belkacem, M., Benameur, T. (2018). On the Role of Activation Volume Parameter in Heterogeneous Deformation of Zr-Based Metallic Glasses. In: Haddar, M., Chaari, F., Benamara, A., Chouchane, M., Karra, C., Aifaoui, N. (eds) Design and Modeling of Mechanical Systems—III. CMSM 2017. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-66697-6_79
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DOI: https://doi.org/10.1007/978-3-319-66697-6_79
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