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Accession Number:
AD0481871
Title:
GRAIN SIZE DEPENDENCE OF FRACTURE OF ALPHA-COPPER ALUMINIUM ALLOYS IN MERCURY.
Corporate Author:
MCMASTER UNIV HAMILTON (ONTARIO) DEPT OF METALLURGY AND METALLURGICAL ENGINEE RING
Report Date:
1966-04-01
Abstract:
Polycrystalline specimens of alpha-phase copper-aluminum alloys of varying composition, amalgamated with mercury, have been deformed in tension in a soft tensile machine. In all cases, brittle intergranular failure occurred at stresses and strains below those required for fracture in air, the degree of embrittlement increasing with increasing aluminum content. The alloys having stacking fault energies less than 8 ergssq cm were found to obey the Petch-Stroh relation. The other alloys showed negative deviations from this relation, particularly for large grain sizes, which became more marked with increasing stacking fault energy. Values of the fracture energy have been obtained for all the alloys they vary from 48 ergssq cm for pure copper, to 470 ergssq cm for Cu-8 wt. Al. These values are only applicable for relatively small grain sizes. A model is proposed to explain the deviation from the Petch-Stroh relation in the high-stacking-fault-energy alloys. Author
Descriptive Note:
Technical rept.,
Pages:
0047
Contract Number:
Nonr-3925(00)
File Size:
0.00MB
