A Neutron and X-ray Diffraction Study of Ca-Mg-Cu Metallic Glasses (Preprint)
Abstract
The structures of Ca60Mg15Cu25, Ca60Mg20Cu20 and Ca60Mg25Cu15 metallic glasses have been investigated by neutron and X-ray diffraction. The correlation functions show a peak manifold in the region 2.2 angstrom to 4.5 angstrom, arising from the various atom pairs for these glasses. The results show clearly that there are contacts between the solute atoms (Cu and Mg) in agreement with a simple estimate of the maximum solute atom fraction beyond which solute-solute contact becomes topologically necessary. The Cu-Mg and Cu-Ca distances are consistent with the sum of covalent radii, whereas all other interatomic distances are consistent with the sum of metallic radii. The neutron and X-ray diffraction correlation functions were simultaneously fitted with a series of symmetric peaks to obtain coordination numbers and interatomic distances, but only the results from the first two peaks, Cu-Cu and Cu-Mg, are of reasonable reliability. The Percus-Yevick approximation for binary hard sphere systems has been used to simulate the results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2011
- Accession Number
- ADA550392
Entities
People
- Alex C. Hannon
- Daniel B. Miracle
- Emma R. Barney
- James M. Scott
- Oleg N. Senkov
- Robert M. Moss
Organizations
- Air Force Research Laboratory