Abstract
Structural changes associated with Kirkendall diffusion in single crystal copper-alpha-brass couples have been studied. Vapour—solid couples in which zinc was diffused into copper from the vapour were investigated using metallographic and X-ray techniques. The following effects were found under certain conditions in the diffusion zone: 1. (1) dislocation formation; 2. (2) arrangement of dislocations into subboundaries; 3. (3) recrystallization and formation of new grains; 4. (4) twin formation. The dislocation density and fineness of substructure were greatest at the lowest diffusion temperatures. Re-crystallization was found at low diffusion temperatures, and twin formation was always associated with recrystallization. An explanation of these phenomena is given in terms of the production and subsequent redistribution of dislocations by climb and slip mechanisms during diffusion.
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