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Ferrari, A. |
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Schimpf, Christian |
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Dunser, M. |
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Thomas, Eric |
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Gecse, Zoltan |
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Tsrunchev, Peter |
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Della Ricca, Giuseppe |
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Cios, Grzegorz |
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Hohlmann, Marcus |
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Dudarev, A. |
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Mascagna, V. |
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Santimaria, Marco |
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Poudyal, Nabin |
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Piozzi, Antonella |
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Mørtsell, Eva Anne |
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Jin, S. |
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Noel, Cédric |
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Fino, Paolo |
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Mailley, Pascal |
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Meyer, Ernst |
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Zhang, Qi |
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Pfattner, Raphael | Brussels |
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Kooi, Bart J. |
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Babuji, Adara |
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Pauporte, Thierry |
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Naleway, Steven
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conferencepaper
Beta Relaxation and Low Temperature Aging of a Gold Based Bulk Metallic Glass
Abstract
The low-temperature aging behavior and atomic structural rearrangements of a Au-Cu-Si-Ag-Pd bulk metallic glass are investigated in the temperature regime of the slow beta relaxation by employing high-intensity synchrotron x-ray scattering, modulated differential scanning calorimetry (MDSC), dynamic mechanical analysis (DMA), impulse excitation, and dilatometry. Evidence of a distinct slow beta-relaxation regime is seen as 1) an excess wing of the DMA loss modulus, 2) a crossover effect of elastic modulus with isothermal aging, and 3) a broad sub-Tg endotherm in the non-reversing MDSC results. Atomic rearrangements were found to be confined mainly to the short-range order length scale with no significant atomic rearrangements in the medium-range order. The crossover effect in elastic modulus is attributed to the evolution of chemical short-range order. These results support the emergent picture of a dynamically heterogeneous glassy structure, in which low-temperature relaxation occurs through atomic rearrangements at the short-range order scale.