Changes in the Burgers Vector of Perfect Dislocation Loops without Contact with the External Dislocations

Journal Article · Fri Mar 31 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.125506· OSTI ID:20777125

Arakawa, K; Hatanaka, M; Mori, H ^[1]; Kuramoto, E ^[2]; Ono, K ^[3]

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1. Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
2. Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580 (Japan)
3. Department of Material Science, Shimane University, 1060 Nishikawatsu, Matsue 690-8504 (Japan)

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.

• OSTI ID: 20777125
• Journal Information: Physical Review Letters, Vol. 96, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.96.125506; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BCC LATTICES
BURGERS VECTOR
DISLOCATIONS
ELECTRON BEAMS
HEATING
IRON
IRRADIATION
TRANSMISSION ELECTRON MICROSCOPY