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Chemical Composition in a Tetrahedron in Quenched α-Brass

The deviation in the chemical composition around a tetrahedron in quenched α-brass (27 at.%Zn) has been examined with a Kevex X-ray energy spectrometer attached to an electron microscope. It has been confirmed that the copper concentration in a tetrahedron is about 3 at.% higher than that in matrix, and this local deviation has been interpreted by the ledge mechanism using the diffusivity difference between copper and zinc atoms in α-brass. It has been also made clear that while the zinc concentration in a tetrahedron is apt to increase to accommodate the volume dilatation, this tendency is not observed because the stacking fault layer prevents the flow of atoms.