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Morphology and growth kinetic advantage of quenched twinned dendrites in Al-Zn alloys

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, ISSN: 1073-5623, Vol: 44, Issue: 6, Page: 2699-2706
2013
  • 19
    Citations
  • 0
    Usage
  • 13
    Captures
  • 0
    Mentions
  • 0
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Metrics Details

  • Citations
    19
    • Citation Indexes
      19
  • Captures
    13

Article Description

Twinned dendrites appearing in an Al-26 wt pct Zn alloy have been quenched during growth using a specifically designed setup that is positioned on top of a directional solidification experiment. X-ray tomography performed at the Swiss Light Source (SLS-beamline TOMCAT) allowed us to reconstruct the 3D morphology of these structures and to confirm previous observations performed on single 2D sections (Henry et al., Metall Mater Trans A 35A:2495-2501, 2004; Salgado-Ordorica and Rappaz, Acta Mater 56:5708-5718, 2008). Further characterization of these quenched specimens led to a better description of the mechanisms involved in the in-plane and lateral growth propagation of twinned dendrites. These were then put into relation with the competition mechanisms taking place during simultaneous solidification of twinned and regular dendrites. © 2013 The Minerals, Metals & Materials Society and ASM International.

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