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Atomic Dynamics of Metallic Glass Melts La50Ni15Al35 and Ce70Cu19Al11 Studied by Quasielastic Neutron Scattering

Published

Author(s)

Peng Luo, Abhishek Jaiswal, Zhikun Cai, Nathan P. Walter, Long Zhou, Dawei Ding, Ming Liu, Rebecca Mills, Andrey Podlesynak, Georg Ehlers, Antonio Faraone, Haiyang Bai, Weihua Wang, Y. Z.

Abstract

By employing quasi-elastic neutron scattering, we studied the atomic-scale relaxation dynamics and transport mechanism of La50Ni15Al35 and Ce69Cu20Al10Nb1 Studied by Quasi-Elastic Neutron Scattering metallic glass melts in the temperature range of over 200 K above their liquidus temperatures. The results show that both liquids exhibit stretched exponential relaxation and Arrhenius-type temperature dependence of the effective diffusion coefficient. The La50Ni15Al35 melt exhibits an activation energy of 0.545±0.008 eV and a stretching exponent ≈0.77−0.86 in the studied temperature range; no change of activation energy as suggested in previous report associated with liquid–liquid phase transition was observed. In contrast, the Ce69Cu20Al10Nb1 Studied by Quasi-Elastic Neutron Scattering melt exbibits larger diffusivity with a much smaller activation energy of 0.201±0.003 eV, and a smaller stretching exponent ≈0.51−0.60 suggestive of more heterogeneous dynamics.
Citation
Physical Review B
Volume
103
Issue
22

Citation

Luo, P. , Jaiswal, A. , Cai, Z. , Walter, N. , Zhou, L. , Ding, D. , Liu, M. , Mills, R. , Podlesynak, A. , Ehlers, G. , Faraone, A. , Bai, H. , Wang, W. and Z., Y. (2021), Atomic Dynamics of Metallic Glass Melts La<sub>50</sub>Ni<sub>15</sub>Al<sub>35</sub> and Ce<sub>70</sub>Cu<sub>19</sub>Al<sub>11</sub> Studied by Quasielastic Neutron Scattering, Physical Review B (Accessed July 4, 2022)
Created June 22, 2021, Updated September 2, 2021