TY - JOUR
T1 - Role of concentration fluctuations in metallic glass formation
AU - Ramachandrarao, P.
AU - Singh, R. N.
AU - Lele, S.
N1 - Funding Information:
The authors are grateful to Professor T.R, Anantharaman for encouragement. The work was undertaken as a part of a Nationally Coordinated Project on Metallic Glasses. Financial assistance for the project from the Department of Science and Technology is gratefully acknowledged.
PY - 1984/5
Y1 - 1984/5
N2 - The glass forming composition range in several binary metallic systems is correlated with the composition dependence of Scc(0), the concentration-concentration fluctuation structure factor at its long wavelength limit. The magnitude of Scc(0) has been evaluated for the liquid phase from available thermodynamic data. It has been observed that Scc(0) exhibits a maximum and tends to the ideal value in the glass forming composition range. Significant and systematic negative deviations from ideal values or the tending to zero of Scc(0) are observed at the stoichiometry corresponding to complexes in the liquid state in the case of compound forming or associated systems. These observations are discussed in terms of the chemical short-range order in the liquid state. It is concluded that while a reasonable degree of order may exist for the compound forming compositions, in the glass forming region itself the liquids are nearly random mixtures of complexes and unassociated component atoms.
AB - The glass forming composition range in several binary metallic systems is correlated with the composition dependence of Scc(0), the concentration-concentration fluctuation structure factor at its long wavelength limit. The magnitude of Scc(0) has been evaluated for the liquid phase from available thermodynamic data. It has been observed that Scc(0) exhibits a maximum and tends to the ideal value in the glass forming composition range. Significant and systematic negative deviations from ideal values or the tending to zero of Scc(0) are observed at the stoichiometry corresponding to complexes in the liquid state in the case of compound forming or associated systems. These observations are discussed in terms of the chemical short-range order in the liquid state. It is concluded that while a reasonable degree of order may exist for the compound forming compositions, in the glass forming region itself the liquids are nearly random mixtures of complexes and unassociated component atoms.
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U2 - 10.1016/0022-3093(84)90191-1
DO - 10.1016/0022-3093(84)90191-1
M3 - Article
AN - SCOPUS:0021423820
SN - 0022-3093
VL - 64
SP - 387
EP - 398
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 3
ER -