Grain boundary characterization in an X750 alloy

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Grain boundary chemistry in an X750 Ni alloy was analyzed by atom probe tomography in an effort to clarify the possible roles of elemental segregation and carbide presence on the stress corrosion cracking behavior of Ni alloys. Two types of cracks are observed: straight cracks along twin boundaries and wavy cracks at general boundaries. It was found that carbides (M23C6 and TiC) are present at both twin and general boundaries, with comparable B and P segregation for all types of grain boundaries. Twin boundaries intercept ?’ precipitates while the general boundaries wave around the ?’ and carbide precipitates. Near a ... continued below

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Fisher, Kevin; Teysseyre, Sebastien & Marquis, Emmanuelle November 1, 2012.

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Grain boundary chemistry in an X750 Ni alloy was analyzed by atom probe tomography in an effort to clarify the possible roles of elemental segregation and carbide presence on the stress corrosion cracking behavior of Ni alloys. Two types of cracks are observed: straight cracks along twin boundaries and wavy cracks at general boundaries. It was found that carbides (M23C6 and TiC) are present at both twin and general boundaries, with comparable B and P segregation for all types of grain boundaries. Twin boundaries intercept ?’ precipitates while the general boundaries wave around the ?’ and carbide precipitates. Near a crack tip, oxidation takes place on the periphery of carbide precipitate.

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  • MRS Fall meeting,Boston, MA,11/25/2012,11/30/2012

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  • Report No.: INL/CON-12-27984
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 1070126
  • Archival Resource Key: ark:/67531/metadc838853

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  • November 1, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 1:58 p.m.

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Fisher, Kevin; Teysseyre, Sebastien & Marquis, Emmanuelle. Grain boundary characterization in an X750 alloy, article, November 1, 2012; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc838853/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.