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The Interpretation of Etch Patterns on Aluminium

1955; Physical Society of Japan; Volume: 10; Issue: 8 Linguagem: Inglês

10.1143/jpsj.10.656

1347-4073

Adrian Forty, F. C. Frank,

Aluminum Alloy Microstructure Properties

An examination of etch patterns obtained with Lacombe's etchant on polycrystals of “ super-purity ” aluminium suggests that an etch pit is produced only where there is a precipitate of impurity present in the surface, and that these are located on dislocations which can therefore be regarded as an indirect cause of etching. It is tentatively estimated that, at best, only about 60 or 70 per cent of the dislocations in super purity Al produce etch pits.