Based on the previous results of undercooling investigation, the critical cooling rate for glass formation (Rc) and crystallization behavior of the Pd40Cu30Ni10P20 alloy are determined and compared with theoretical calculation results using the classical nucleation theory (CNT). As nucleating homogeneously, the Rc is evaluated to be 2.08×10-5 K/s under continuous cooling, which is underestimated by four orders of magnitude against the experimental results. Actual crystallization of the alloy is dominated by a heterogeneous nucleation mechanism. Considering foreign substrate-induced nucleation, the wetting angle (θ) between crystalline embryo and undercooled melt is evaluated to be about 62.5°. Furthermore, other heterogeneous nucleation mechanisms beyond the CNT are discussed to fit the experimental results.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys