Thermodynamics,viscous flow and relaxation dynamics of bulk glass-forming Pd alloys |
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| Institution: | 1. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States;2. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, United States;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, Shaanxi Province, PR China;2. Université de Lyon, CNRS, INSA-Lyon, MATEIS UMR5510, F-69621 Villeurbanne, France;3. SIMAP, INP Grenoble/CNRS/UJF, 38402, Saint-Martin d''Hères, Cedex, France;1. Laboratory of Infrared Material and Devices & Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Advanced Technology Research Institute, Ningbo University, Ningbo, 315211, China;2. Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, 315211, China;3. CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, China |
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| Abstract: | Experimental results concerning the thermodynamic excess properties and the equilibrium shear viscosity of the undercooled liquid state are presented, which were consistently obtained on Pd-rich bulk metallic glasses of different stability by applying the concept of the limiting fictive temperature. These results are evaluated with respect to the stability criteria that are controlling vitrification. In addition, modulated-temperature calorimetry has been performed to obtain the average relaxation time of the cooperative liquid modes near the glass transition directly in dependence of temperature. The results are compared to data obtained from static non-equilibrium measurements and discussed with respect to the relation between fragility and thermal stability of Pd-rich bulk glass-forming alloys. |
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