Effect of sample size on intermetallic Al2Cu microstructure and orientation evolution during directional solidification

Ka Gao, Shuangming Li, Lei Xu, Hengzhi Fu

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Al-40% Cu hypereutectic alloy samples were successfully directionally solidified at a growth rate of 10 μm/s in different sizes (4 mm, 1.8 mm, and 0.45 mm thickness in transverse section). Using the serial sectioning technique, the three-dimensional (3D) microstructures of the primary intermetallic Al 2Cu phase of the alloy can be observed with various growth patterns, L-shape, E-shape, and regular rectangular shape with respect to growth orientations of the (110) and (310) plane. The L-shape and regular rectangular shape of Al2Cu phase are bounded by {110} facets. When the sample size was reduced from 4 mm to 0.45 mm, the solidified microstructures changed from multi-layer dendrites to single-layer dendrite along the growth direction, and then the orientation texture was at the plane (310). The growth mechanism for the regular faceted intermetallic Al2Cu at different sample sizes was interpreted by the oriented attachment mechanism (OA). The experimental results showed that the directionally solidified Al-40% Cu alloy sample in a much smaller size can achieve a well-aligned morphology with a specific growth texture.

Original languageEnglish
Pages (from-to)89-96
Number of pages8
JournalJournal of Crystal Growth
Volume394
DOIs
StatePublished - 15 May 2014

Keywords

  • A1. Characterization
  • A1. Crystal morphology
  • A1. Dendrites
  • A1. Directional solidification
  • A2. Double crucible technique
  • B1. Alloys

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