Technical Paper

Transactions of the Indian Institute of Metals

, Volume 65, Issue 6, pp 777-782

Microstructures of Directionally Solidified Al–Ag–Cu Ternary Eutectics

  • Anne DennstedtAffiliated withDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Materialphysik im Weltraum Email author 
  • , Lorenz RatkeAffiliated withDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Materialphysik im Weltraum

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Abstract

Different three-phase microstructures are observed in directionally solidified Al–Ag–Cu ternary eutectics composed of an Ag2Al, an Al2Cu and a solid solution α-Al phase. A survey from regular to irregular structures is given and some special, new structural defects are observed and discussed. An approach for the quantitative description of the rich variety of complex three-phase microstructures is suggested including the defects. Shape factor and specific surface area of the phase particles are determined and compared for different microstructures.

Keywords

Al–Ag–Cu Ternary eutectics Directional solidification Microstructures