Precipitation in Gold-Nickel Single Crystals

摘要

Magnetic, x-ray, and microscope examinations have been made on single-crystal disks of a Au-Ni alloy containing 24.8 at.% nickel to investigate the precipitation process. The precipitation begins on the surface at discrete areas which grow broader and deeper as annealing progresses. Magnetic data can be interpreted by assuming that the Ni-rich precipitate is elongated in the 〈111〉 directions, electron micrographs indicating the presence of elongation. The Ni-rich phase acquires a small degree of crystalline orientation with increased annealing, whereas the Au-rich phase maintains an appreciable amount of orientation throughout.