4.7 Article

The kinetics of Fe-rich intermetallic formation in aluminium alloys: In situ observation

期刊

SCRIPTA MATERIALIA
卷 60, 期 7, 页码 516-519

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2008.11.048

关键词

X-ray radiography; Image analysis; Aluminum Alloys; Intermetallics; Kinetics

资金

  1. Ford Motor Company
  2. Imperial College London
  3. SRS Daresbury Laboratory Beam [50264]
  4. EPSRC [EP/F001452/1] Funding Source: UKRI
  5. Engineering and Physical Sciences Research Council [EP/F001452/1] Funding Source: researchfish

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In situ synchrotron radiography of Fe-rich intermetallic formation was performed during the solidification of an Al-7.5Si3.5Cu-0.8Fe (wt.%) alloy. Growth kinetics was quantified by segmenting the Fe-rich intermetallic phases and nucleation temperatures were determined by extrapolating to zero size. Fe-rich beta-intermetallics nucleated between 550 and 570 degrees C, growing initially at an instantaneous tip velocity of 100 mu m s(-1), and slowing to 10 mu m s(-1) towards the end of growth. Final plate size was controlled by local Fe concentration and alpha-Al impingement. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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