A combined X-ray diffraction and Monte Carlo simulation study was made, of the structure of  = 13 [001] twist boundaries, for Ag concentrations of 0, 25, 50, 75 and 100at%. In the case of the 50% alloy, a large number of absolute grain boundary structure factors was measured, both in the plane of the grain boundary and normal to it. Fewer structure factors were measured for other compositions. However, their magnitudes were found to be useful in setting limits on the extent of interfacial segregation. A generally good agreement was found between the measurements and calculations. In the case of the 50% alloy, it was concluded that alloying with Ag produced only very slight boundary segregation and changes in the positions of the substitutional sites in the boundaries (relative to pure Au). The Au and Ag atoms were distributed almost randomly on these sites.

I.Majid, C.A.Counterman, P.D.Bristowe, R.W.Balluffi: Acta Metallurgica et Materialia, 1994, 42[10], 3331-40