Volume 108, Number 4, November 2014
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||12 November 2014|
Observation of distinct atomic relaxation process in a phase-separated metallic glass-forming melt
1 Department of Physics and Materials Science, City University of Hong Kong - Kowloon Tong, Hong Kong
2 Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut - CH-5232 Villigen, PSI, Switzerland
3 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083, PRC
Received: 6 July 2014
Accepted: 22 October 2014
We have investigated the atomic relaxation processes in phase-separated alloy melts using quasielastic neutron scattering. Among the three alloy melts studied (i.e., Al30Cu20Sn50, Al30Cu30Sn40 and Y28Ti28Al24Co20), Y28Ti28Al24Co20 is not only a phase-separated melt but also vitrified upon quenching. In this glass-forming melt, we have observed dissimilar relaxation processes in the different phases of the melt: a collective atomic transport process in the phase that exhibits a slow relaxation process and an atomic jump diffusion process in the phase that displays a fast relaxation process. Interestingly, the temperature dependence of the diffusion process in the former phase is a non-Arrhenius process, which is similar to that observed in many fragile glass-forming liquids. In contrast, the temperature dependence of the diffusion process is an Arrhenius process in the later phase, which is a characteristic of non–glass-forming simple liquids.
PACS: 66.10.cg – Mass diffusion, including self-diffusion, mutual diffusion, tracer diffusion, etc. / 61.05.fg – Neutron scattering (including small-angle scattering) / 68.35.Rh – Phase transitions and critical phenomena
© EPLA, 2014
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