An analysis was made of X-ray powder pattern peaks of bulk polycrystalline Ag-9at%Sn alloy, plastically deformed in compression. The shapes and positions of all of the available (hkl) reflections were recorded using the focusing, Bragg-Brentano X-ray geometry. Fourier analysis of the profiles was carried out on (111)-(222), (200)-(400) and (220)-(440) pairs of reflections. The effective particle sizes, Dhkl, decreased rapidly with increasing deformation and reached values of D111 = 110Å, D100 = 40Å and D110 = 90Å beyond a 20% reduction in thickness. The anisotropy of the particle sizes was interpreted as being a consequence of faulting in the deformed alloy. The mean square strains in the [111] direction were of the order of 10-5 after more than 20% reduction in thickness. Lattice parameter measurements yielded the deformation fault probability (0.02), and the residual stresses. The variation of the true lattice parameter with increasing deformation indicated that segregation occurred in the deformed alloy. From these data, a nominal stacking-fault energy of 6mJ/m2 was calculated.

X-Ray Diffraction Study of a Bulk, Polycrystalline Ag-9At. Pct Sn Alloy Deformed in Compression. R.P.I.Adler, C.N.J.Wagner: Metallurgical Transactions, 1970, 1[10], 2791-7