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Title: High-resolution electron microscopy observation and dislocation reaction mechanism of fivefold twinning in a Cu-rich precipitate in a cold rolled ferritic steel containing copper

Ferritic steels containing copper have been studied as model systems for clusters/precipitate formation in reactor pressure vessel steels. The samples were aged at 400 °C for 4000 h and subsequently cold rolled to 30% reduction at room temperature. The microstructural characteristics of the samples were analyzed using high-resolution transmission electron microscopy. Direct evidence was found that the fivefold twinning occurs via simultaneous emission of two Shockley partial dislocations from two particular α-Fe/Cu interfaces, and then the pileup tips of the twofold twin. - Highlights: • Fivefold twin is observed in a Cu-rich precipitate in cold rolled ferritic steels. • A dislocation reaction mechanism for the fivefold twin formation is proposed. • Two particular mismatching α-Fe/Cu-rich precipitate interfaces play a critical role.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ; ; ;  [1] ;  [3] ;  [4] ;  [2]
  1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620 (China)
  2. (United States)
  3. Institute of Materials, Shanghai University, Shanghai 200072 (China)
  4. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2104 (United States)
Publication Date:
OSTI Identifier:
22403533
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 95; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPPER; DISLOCATIONS; FERRITIC STEELS; INTERFACES; IRON; MICROSTRUCTURE; PRECIPITATION; PRESSURE VESSELS; REACTION KINETICS; ROLLING; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; TWINNING