Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl

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Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped ... continued below

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6 p.

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Jayaram, R. & Miller, M.K. March 1, 1995.

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  • Jayaram, R. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  • Miller, M.K. Oak Ridge National Lab., TN (United States)

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Description

Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped NiAl to a mixture of intergranular and transgranular fracture mode in zirconium-doped NiAl. The NiAl matrix was severely depleted of the solutes molybdenum and zirconium. Small Mo-rich precipitates, detected in the matrix and grain boundaries, are likely to contribute to the significant increase in the room-temperature yield stress of microalloyed NiAl through a precipitation hardening mechanism.

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6 p.

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OSTI as DE95008848

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95008848
  • Report No.: CONF-941144--101
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 35407
  • Archival Resource Key: ark:/67531/metadc675364

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  • March 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 22, 2016, 11:40 a.m.

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Jayaram, R. & Miller, M.K. Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl, article, March 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc675364/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.