Pressure-temperature-time-transition diagram in a strong metallic supercooled liquidW. H. Wang1, W. Utsumi2 and X.-L. Wang3
1 Institute of Physics, Chinese Academy of Sciences - Beijing 100080, PRC
2 Japan Atomic Energy Research Institute, SPring-8 - Hyogo 679-5198, Japan
3 Spallation Neutron Source and Metals Ceramics Division Oak Ridge National Laboratory - Oak Ridge, TN 37830, USA
received 10 February 2005; accepted in final form 20 June 2005
published online 22 July 2005
The crystallization kinetics and nucleation mechanism of a bulk metallic glass-forming alloy (vit4) in the entire supercooled liquid region (SLR) is investigated using in situ high-pressure and high-temperature X-ray diffraction with synchrotron radiation, which allows us for the first time to simultaneously determine the crystallization kinetics and phase evolution of a metallic liquid as a function of time under high pressure. The results are summarized in a pressure-time-temperature-transformation (PTTT) diagram with two time scales. The results suggest that the dominant crystallization mechanism of the BMG is growth-controlled.
61.43.Fs - Glasses.
62.50.+p - High-pressure and shock wave effects in solids and liquids.
64.70.Dv - Solid-liquid transitions.
© EDP Sciences 2005