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Structural Relaxation, Rejuvenation and Plasticity of Metallic Glasses: Microscopic Details from Anelastic Relaxation Spectra

https://doi.org/10.3390/ma16237444

Atzmon, Michael; Ju, Jong Doo; Lei, Tianjiao (December 2023, Materials)

The lack of periodicity and long-range order poses significant challenges in explaining and modeling the properties of metallic glasses. Conventional modeling of nonexponential relaxation with stretched exponents leads to inconsistencies and rarely offers information on microscopic properties. Instead, using quasi-static anelastic relaxation, we have obtained relaxation-time spectra over >10 orders of magnitude of time for several metallic glasses. The spectra enable us to examine in microscopic detail the distribution of shear transformation zones and their properties. They reveal an atomically-quantized hierarchy of shear transformation zones, providing insights into the effect of structural relaxation and rejuvenation, the origin of plasticity and the mechanisms of the alpha and beta relaxation.
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Compositional inhomogeneity and its effect on the hardness of nanostructured refractory high-entropy alloys

https://doi.org/10.1016/j.matchar.2023.113563

Wang, Chunyang; Qin, Mingde; Lei, Tianjiao; Wan, Liyang; Shivakumar, Sashank; Kisslinger, Kim; Rupert, Timothy J.; Luo, Jian; Xin, Huolin L. (December 2023, Materials Characterization)

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Discovery of Ni activated sintering of MoNbTaW predicted by a computed grain boundary diagram

https://doi.org/10.1016/j.scriptamat.2023.115777

Shivakumar, Sashank; Song, Keqi; Wang, Chunyang; Lei, Tianjiao; Xin, Huolin L.; Rupert, Timothy J.; Luo, Jian (January 2023, Scripta Materialia)

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Processing-dependent stabilization of a dissimilar rare-earth boride in high-entropy (Ti0.2Zr0.2Hf0.2Ta0.2Er0.2)B2 with enhanced hardness and grain boundary segregation

https://doi.org/10.1016/j.jeurceramsoc.2022.05.034

Qin, Mingde; Shivakumar, Sashank; Lei, Tianjiao; Gild, Joshua; Hessong, Esther C.; Wang, Haoren; Vecchio, Kenneth S.; Rupert, Timothy J.; Luo, Jian (September 2022, Journal of the European Ceramic Society)

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