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- W229629160 abstract "The radioactive isotopes Cr/sup 51/, Cu/sup 64/, Zn/sup 65/, Zr/sup 95/, and W/sup 185/ were used in the study of Al alloys. Two methods of radiation detection were used-ionization for control, and radiographic to investigate the distribution of the elements in the alloys. All the alloying elements except Cr were added as master alloys. Cr alloys were made by adding a mixture of equal parts of Cr oxide and cryolite to Al at 1000 deg C. The intensity of radiation from 200 g samples was 25 m curie for Cu/sup 64/ and 5 m curie for the remainder. The radiographic method measured beta -radiation for all the alloys except those containing Zn/sup 65/ although all the elements except Cr/sup 51/ emit both beta and gamma radiation. The distribution of Zn in Al-Zn alloys was investigated in the cast state and after tempering at 435 deg C for 24 hr. It was uni-form in both cases. Similar results were obtained for the distribution of Cr in Al-Zn-Mg- Cu alloys. Two alloys of the Al-Zn-Mg-Cu type containing approximately 2 and 0.2% Cu were examined for Cu distribution in the cast state, after homogenizing at 430 deg C for 17 hr, after hotmore » rolling at 460 deg C, after quenching from 470 deg C, after heating at 430 deg C and slow cooling in the furnace, and after quenching and ageing at 120 deg C for 9 hr. On all the radiographs there was a uniform background with individual light spots. The Cu was shown to be in solid solution and not in the grain boundaries by magnifying to 100X. The light spots on the macro radiograph indicate local concentrations of Cu, the quantity and intensity being proportional to the Cu content, and decreasing after thermal and mechanical treatments. It was proposed that they were centers of corrosion in alloys containing more than 1% Cu. Alloys were therefore tested for two weeks in 3% aqueous solution of NaCl and 0.1% H/sub 2/O/sub 2/. Photographs of the surfaces were taken and compared with the radiographs. This confirmed that the local concentrations of Cu were indeed the centers of corrosion. (TCO)« less" @default.
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- W229629160 date "1959-01-01" @default.
- W229629160 modified "2023-09-26" @default.
- W229629160 title "USE OF RADIOACTIVE INDICATORS IN STUDYING THE DISTRIBUTION AND BEHAVIOUR OF ADMIXTURES IN THE PRODUCTION OF ALLOYS" @default.
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