Critical cooling rate (Rc) for glass formation has been calculated from an integrated transformation curve, constructed by combining continuous cooling transformation (CCT) and continuous heating transformation (CHT) curves. The CCT and CHT curves were calculated from experimental measurements on cooling rate dependence of solidification onset temperature using classical nucleation kinetics and heating rate dependence of crystallization onset temperature using Kissinger method, respectively. The critical cooling rate was calculated from the intersection point of the two curves, corresponding to an apparent nose point in the integrated transformation curve. The calculated critical cooling rates were in good agreement with those measured for five different bulk glass forming alloys of Ca-Mg-Zn, Pd-Ni-Cu-P, Zr-Ti-Cu-Ni-Be and Mg-Cu-Y alloys.
Bibliographical noteFunding Information:
The authors are grateful for the financial support of the Creative Research Initiatives of the Korean Ministry of Science and Technology. W.T. Kim also thanks for the financial support from the Center for Advanced Materials Processing (CAMP) of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry