Anisotropic dislocation loop nucleation in ion-irradiated MgAl sub 2 O sub 4

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Polycrystalline disks of stoichiometric magnesium aluminate spinel (MgAl{sub 2}O{sub 4}) were irradiated with 2 MeV Al{sup +} ions at 650{degrees}C and subsequently analyzed in cross-section using transmission electron microscopy (TEM). Interstitial dislocation loops were observed on 110 and 11 habit planes. The population of loops on both sets of habit planes was strongly dependent on their orientation with respect to the ion beam direction. The density of loops with habit plane normals nearly perpendicular to the ion beam direction much higher than loops with habit plane normals nearly parallel to the ion beam direction. On the other hand, the loop ... continued below

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Pages: (15 p)

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Zinkle, S.J. January 1, 1991.

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Polycrystalline disks of stoichiometric magnesium aluminate spinel (MgAl{sub 2}O{sub 4}) were irradiated with 2 MeV Al{sup +} ions at 650{degrees}C and subsequently analyzed in cross-section using transmission electron microscopy (TEM). Interstitial dislocation loops were observed on 110 and 11 habit planes. The population of loops on both sets of habit planes was strongly dependent on their orientation with respect to the ion beam direction. The density of loops with habit plane normals nearly perpendicular to the ion beam direction much higher than loops with habit plane normals nearly parallel to the ion beam direction. On the other hand, the loop size was nearly independent of habit plane orientation. This anisotropic loop nucleation does not occur in ion-irradiated metals such as copper. An additional anomaly associated with ion-irradiated spinel is that the loops on 111 planes were partially unfaulted with a Burgers vector of b = a/4<110>. Previous neutron irradiation studies have never reported unfaulted loops in stoichiometric spinel. Possible cause of the unusual response of spinel to ion irradiation are discussed. 12 refs., 14 figs.

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Pages: (15 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • International conference on fusion reactor materials, Clearwater, FL (United States), 17-22 Nov 1991

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  • Other: DE92001681
  • Report No.: CONF-911111-2
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5147593
  • Archival Resource Key: ark:/67531/metadc1057567

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:15 p.m.

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Zinkle, S.J. Anisotropic dislocation loop nucleation in ion-irradiated MgAl sub 2 O sub 4, article, January 1, 1991; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1057567/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.