Increasing the growth velocity of coupled eutectics in directional solidification of off-eutectic alloys

S. M. Li, Q. R. Quan, X. L. Li, H. Z. Fu

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A simple and effective approach of employing an abrupt increase in growth velocity is presented to obtain entirely coupled eutectics in directional solidification of off-eutectic alloys. Using the proposed approach, the velocity required for the growth of entirely coupled eutectics in off-eutectic alloys can be increased remarkably. In directionally solidified Al40 wt% Cu hypereutectic alloys with a thermal gradient of 250 K/cm, primary Al 2Cu dendrites appeared at constant growth velocities ranging from 5 to 100 μm/s and entirely coupled eutectics formed at 1 μm/s. Employing the abrupt increase in growth velocity, the growth velocity of purely coupled eutectics could attain 100 μm/s.

Original languageEnglish
Pages (from-to)279-284
Number of pages6
JournalJournal of Crystal Growth
Volume314
Issue number1
DOIs
StatePublished - 1 Jan 2011

Keywords

  • A1. Directional solidification
  • A1. Eutectics
  • A2. Bridgman technique
  • A2. Growth from melt
  • B1. Alloys

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