Hardness and microstructure of internally oxidized silver alloys

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Alloys of Ag, Ag/1.12 at.% Mg, and Ag/0.25 at.% Mg-0.25 at.% Ni were internally oxidized at 450 to 825 C and their hardnesses and microstructure were observed. Microhardness profiles showed that hardness was high near the surface and decreased with depth into the sample. Microstructure contained regions of small and large grains, where region sizes were dependent on treatment temperature. Transitions between small- and large-grained regions were abrupt. Treatments at higher temperatures failed to alter grain structure, indicating that Mg-O clusters had indeed pinned the grain boundaries. Clustering was shown to affect the hardness of oxidized alloys, not only by ... continued below

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16 p.

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Prorok, B. C.; Park, J. H.; Goretta, K. C.; Balachandran, U. & McNallan, M. J. November 11, 1999.

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Alloys of Ag, Ag/1.12 at.% Mg, and Ag/0.25 at.% Mg-0.25 at.% Ni were internally oxidized at 450 to 825 C and their hardnesses and microstructure were observed. Microhardness profiles showed that hardness was high near the surface and decreased with depth into the sample. Microstructure contained regions of small and large grains, where region sizes were dependent on treatment temperature. Transitions between small- and large-grained regions were abrupt. Treatments at higher temperatures failed to alter grain structure, indicating that Mg-O clusters had indeed pinned the grain boundaries. Clustering was shown to affect the hardness of oxidized alloys, not only by inhibiting grain growth, but also by inhibiting dislocation motion.

Physical Description

16 p.

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OSTI as DE00750583

Medium: P; Size: 16 pages

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  • 16th Annual Conference on Magnet Technology, Ponte Vedra Beach, FL (US), 09/27/1999--10/02/1999

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  • Report No.: ANL/ET/CP-100458
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750583
  • Archival Resource Key: ark:/67531/metadc705811

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  • November 11, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 3:17 p.m.

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Prorok, B. C.; Park, J. H.; Goretta, K. C.; Balachandran, U. & McNallan, M. J. Hardness and microstructure of internally oxidized silver alloys, article, November 11, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc705811/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.