TY - JOUR
T1 - Microstructural features of phase transformation in a binary Pd-Si metallic glass
AU - Chen, N.
AU - Yao, K. F.
AU - Ruan, F.
N1 - Funding Information:
This work was supported by The Natural Science Foundation of China (Grant No. 50671050 and 50431030), the Basic Science Research Foundation of Tsinghua University (Grant No. 091201107) and the National Center for Nanoscience and Technology of China. We wish to thank Dr W.H. Wang, Dr M.X. Pan and Y. T. Wang of the Institute of Physics, Chinese Academy of Sciences, for their help.
PY - 2007/9
Y1 - 2007/9
N2 - Glassy ribbons of Pd-Si alloys were prepared by a combination of melt spinning and flux treatment. The crystallization behaviour of a Pd81Si19 glassy alloy was studied through isothermal annealing at temperatures ranging lower than the glass-transition temperature Tg to around the onset of crystallization. The evolution of microstructures arising from isothermal annealing was investigated by X-ray diffraction (XRD) and (high-resolution) transmission electron microscopy ((HR)TEM). XRD spectra showed that, after the sample was annealed at a sub-Tg temperature, its first diffraction peak was split into two overlapping broad peaks. TEM analysis revealed the formation of a spherical, particle-like glassy phase embedded in the glassy matrix together with a finely connected network morphology within both. Combining these observations with compositional analysis suggested that phase separation had taken place during sub-Tg annealing. When the glassy alloy was annealed at temperatures higher than Tg, nanocrystalline structures, composed of Pd3Si and Pd phases plus a Pd9Si2 phase with a lamellar structure, was formed.
AB - Glassy ribbons of Pd-Si alloys were prepared by a combination of melt spinning and flux treatment. The crystallization behaviour of a Pd81Si19 glassy alloy was studied through isothermal annealing at temperatures ranging lower than the glass-transition temperature Tg to around the onset of crystallization. The evolution of microstructures arising from isothermal annealing was investigated by X-ray diffraction (XRD) and (high-resolution) transmission electron microscopy ((HR)TEM). XRD spectra showed that, after the sample was annealed at a sub-Tg temperature, its first diffraction peak was split into two overlapping broad peaks. TEM analysis revealed the formation of a spherical, particle-like glassy phase embedded in the glassy matrix together with a finely connected network morphology within both. Combining these observations with compositional analysis suggested that phase separation had taken place during sub-Tg annealing. When the glassy alloy was annealed at temperatures higher than Tg, nanocrystalline structures, composed of Pd3Si and Pd phases plus a Pd9Si2 phase with a lamellar structure, was formed.
UR - http://www.scopus.com/inward/record.url?scp=34547684262&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34547684262&partnerID=8YFLogxK
U2 - 10.1080/09500830701441905
DO - 10.1080/09500830701441905
M3 - Article
AN - SCOPUS:34547684262
VL - 87
SP - 677
EP - 686
JO - Philosophical Magazine Letters
JF - Philosophical Magazine Letters
SN - 0950-0839
IS - 9
ER -