TY - JOUR
T1 - Glass forming ability in Cu-Zr binary alloy
T2 - Effect of nucleation mode
AU - Yang, W.
AU - Liu, F.
AU - Liu, H.
AU - Wang, H. F.
AU - Chen, Z.
AU - Yang, G. C.
PY - 2009/9/18
Y1 - 2009/9/18
N2 - In the present work, thermodynamic and kinetic calculations were combined to study the glass forming ability of Cu-Zr binary system. Applying thermodynamic association model, the primarily crystallized phase and its corresponding driving force can be determined firstly. Then, the whole Time-Temperature-Transformation (TTT) diagrams basing on homogeneous and heterogeneous nucleation modes have been constructed quantitatively. As for the former case, the critical cooling rate is underestimated by about three orders of magnitude in comparison with the experimental observation. As for the latter case adopting suitable values of catalytic factor f(θ) and potential nuclei N1, the predictions agree well with the experimental results, and moreover, the nose temperature of TTT diagram is upper-shifted. This has been discussed using a competition of the atomic mobility and the reduced nucleation barrier, as well as its further effect on the nucleation and growth process.
AB - In the present work, thermodynamic and kinetic calculations were combined to study the glass forming ability of Cu-Zr binary system. Applying thermodynamic association model, the primarily crystallized phase and its corresponding driving force can be determined firstly. Then, the whole Time-Temperature-Transformation (TTT) diagrams basing on homogeneous and heterogeneous nucleation modes have been constructed quantitatively. As for the former case, the critical cooling rate is underestimated by about three orders of magnitude in comparison with the experimental observation. As for the latter case adopting suitable values of catalytic factor f(θ) and potential nuclei N1, the predictions agree well with the experimental results, and moreover, the nose temperature of TTT diagram is upper-shifted. This has been discussed using a competition of the atomic mobility and the reduced nucleation barrier, as well as its further effect on the nucleation and growth process.
KW - Kinetics
KW - Metallic glasses
KW - Phase transformation
KW - Thermodynamic modeling
UR - http://www.scopus.com/inward/record.url?scp=69949182346&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2009.05.020
DO - 10.1016/j.jallcom.2009.05.020
M3 - 文章
AN - SCOPUS:69949182346
SN - 0925-8388
VL - 484
SP - 702
EP - 707
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -