title: Changes in the Burgers vector of perfect dislocation loops without contact with the external dislocations.
abstract: We report the observations of a new type of changing process in the Burgers vector of dislocations by in situ transmission electron microscopy. Small interstitial-type perfect dislocation loops in bcc iron with diameters less than approximately 50 nm are transformed from a 1/2<111> loop to another 1/2<111> one or an energetically unfavorable <100> one; furthermore, a <100> loop is transformed to a 1/2<111> one. These transformations occurred on high-energy electron irradiation or simple heating without contact with external dislocations. The origin of these phenomena is discussed.
authors.affiliation: Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan. arakawak@uhvem.osaka-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Arakawa
authors.forename: M
authors.initials: M
authors.lastname: Hatanaka
authors.forename: E
authors.initials: E
authors.lastname: Kuramoto
authors.forename: K
authors.initials: K
authors.lastname: Ono
authors.forename: H
authors.initials: H
authors.lastname: Mori