Misfit dislocations associated with ultrathin twins along a Ni{sub 3}Al/Ni{sub 3}Nb interface

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Typical defects of a Ni{sub 3}Al (L1{sub 2})/Ni{sub 3}Nb (DO{sub a}) faceted interface associated with the orientation relationships (1 1 {bar 1})Ni{sub 3} Al{parallel}(0 1 0)Ni{sub 3}Nb and [1 {bar 1} 0]Ni{sub 3}Al{parallel}[1 0 0]Ni{sub 3}Nb are reported. High resolution electron microscopy reveals the presence, alone, the same interface, of ledges separating facets with different atomic structures. Some facets are associated with certain interfacial thicknesses since their structures involve one planar fault or an intermediate ultrathin Ni{sub 3}Al crystal. The observed ledges are associated with a misfit dislocation (MD) with b = ({minus}1/6)[112]Ni{sub 3}Al. This vector is determined from the ... continued below

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4 p.

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Bonnet, R.; Loubradou, M.; Dahmen, U. & Hinderberger, S. May 1995.

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Description

Typical defects of a Ni{sub 3}Al (L1{sub 2})/Ni{sub 3}Nb (DO{sub a}) faceted interface associated with the orientation relationships (1 1 {bar 1})Ni{sub 3} Al{parallel}(0 1 0)Ni{sub 3}Nb and [1 {bar 1} 0]Ni{sub 3}Al{parallel}[1 0 0]Ni{sub 3}Nb are reported. High resolution electron microscopy reveals the presence, alone, the same interface, of ledges separating facets with different atomic structures. Some facets are associated with certain interfacial thicknesses since their structures involve one planar fault or an intermediate ultrathin Ni{sub 3}Al crystal. The observed ledges are associated with a misfit dislocation (MD) with b = ({minus}1/6)[112]Ni{sub 3}Al. This vector is determined from the comparison of the experimental images and simulated images. The multislice method has been applied with atom boxes which account for the elastic field surrounding each misfit dislocation core.

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4 p.

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OSTI as DE96004741

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  • 7. international conference on intergranular and interphase boundaries in materials (IIB-7), Lisbon (Portugal), 26-30 Jun 1995

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  • Other: DE96004741
  • Report No.: LBL--37912
  • Report No.: CONF-9506281--3
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/195696 | External Link
  • Office of Scientific & Technical Information Report Number: 195696
  • Archival Resource Key: ark:/67531/metadc669167

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  • May 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 5, 2016, 12:29 p.m.

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Bonnet, R.; Loubradou, M.; Dahmen, U. & Hinderberger, S. Misfit dislocations associated with ultrathin twins along a Ni{sub 3}Al/Ni{sub 3}Nb interface, report, May 1995; California. (digital.library.unt.edu/ark:/67531/metadc669167/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.