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Journal of Materials Science

, Volume 30, Issue 6, pp 1439–1444 | Cite as

Directional recrystallization in mechanically alloyed oxide dispersion-strengthened metals by annealing in a moving temperature gradient

  • W. Sha
  • H. K. D. H. Bhadeshia
Papers

Abstract

The directional recrystallization behaviour of mechanically alloyed oxide dispersion-strengthened nickel- and iron-base alloys, MA760 and MA956, has been investigated by annealing in a moving temperature gradient (zone or laser annealing). The directional microstructure produced in MA760 was found to become more isotropic as the zone-annealing speed was increased. At the same time, the recrystallization front tended to become irregular with some nucleation occurring ahead of the main front as the zone-annealing speed exceeded the grain-boundary velocity. These data have been analysed theoretically. Laser-induced recrystallization has also been explored, as another method of annealing a sample in a moving temperature gradient. In the case of the iron-base MA956 alloy, recrystallization occurred directionally along the bar extrusion direction, irrespective of the laser zone-annealing direction.

Keywords

Oxide Polymer Microstructure Nickel Recrystallization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • W. Sha
    • 1
  • H. K. D. H. Bhadeshia
    • 1
  1. 1.Department of Materials Science and MetallurgyUniversity of Cambridge/JRDCCambridgeUK

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