Effects of precipitation on electron displacement damage in FCC alloys: copper alloys with random and modulated microstructures

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Observations on the electron displacement damage behavior of spatially random precipitate in Cu-Co alloys and the modulated structure in Cu-Ti alloys are reported. A few observations of the damage structures in cellularly decomposed Cu-Ti were also made. Results show that (a) metastable quenched solid solution Cu-2wt percent Co alloys, or the same alloys aged to produce coherent Co- rich zones, do not differ greatly from elemental Cu in their behavior under 1 MeV electron irradiation. When the same alloys are aged to form longer incoherent precipitate prior to HVEM irradiation, suppression of the early small loop stage of damage occurs ... continued below

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4 p.

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Carpenter, R.W. January 1, 1975.

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Description

Observations on the electron displacement damage behavior of spatially random precipitate in Cu-Co alloys and the modulated structure in Cu-Ti alloys are reported. A few observations of the damage structures in cellularly decomposed Cu-Ti were also made. Results show that (a) metastable quenched solid solution Cu-2wt percent Co alloys, or the same alloys aged to produce coherent Co- rich zones, do not differ greatly from elemental Cu in their behavior under 1 MeV electron irradiation. When the same alloys are aged to form longer incoherent precipitate prior to HVEM irradiation, suppression of the early small loop stage of damage occurs but voids are nucleated in both cases; (b) metastable modulated microstructures in quenched or low temperature aged Cu-4wt percent Ti alloys completely surpressed void nucleation up to fluences on the order of 50 dpa. The very fine scale microstructural changes that occurred during irradiation in the modulated Cu-4wt percent Ti alloys were not resolved in detail, but it appears that the basic difference between Cu-4wt percent Ti and Cu-2wt percent Co was a much larger point defect sink density in the former, resulting in suppression of void nucleation. Since only one irradiation temperature was investigated, namely approximately 300$sup 0$C, these conclusions cannot be taken as a general statement concerning the merits of modulated structures with respect to radiation damage, but the results are encouraging. Certainly microstructural coarsening is to be expected during irradiation if the temperature is much above 350$sup 0$C, and the results may be quite different. (auth)

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4 p.

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  • 4. high voltage electron microscopy conference, Touliuse, France, 1 Sep 1975

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  • Report No.: CONF-750982--1
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4164907
  • Archival Resource Key: ark:/67531/metadc865653

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 10, 2017, 8:43 p.m.

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Carpenter, R.W. Effects of precipitation on electron displacement damage in FCC alloys: copper alloys with random and modulated microstructures, article, January 1, 1975; Tennessee. (digital.library.unt.edu/ark:/67531/metadc865653/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.