Influence of gravity on the microstructure of directionally solidified Al-In monotectic alloy

Makoto Yoshida, Shinsuke Murao, Ichiro Aoi, Hideo Nakae

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

To investigate the influence of gravity on the microstructure of directionally solidified Al-In monotectic alloy, downward U.D.S. (direction to gravity) and upward U.D.S. (opposite direction to gravity) was carried out. To realize downward U.D.S., zone-melting method was introduced in order to eliminate cavity which inevitably appears in front of solid/liquid interface in current Bridgman method. A hyper-monotectic alloy, Al-18.0 mass%In, was used to examine gravitational segregation on both primary and monotectic L2(In) phases. (1) The gravitational macro-segregation and their condensation of primary L2 liquid were observed at the bottom of molten alloy in the downward U.D.S. In the case of the upward U.D.S., the primaries dispersed in aligned monotectic morphology. On the monotectic reaction, macro-segregation of L2 liquid growing cooperatively with α(Al) phase was not observed neither in upward nor in downward U.D.S. However, the morphology in downward U.D.S. had a tendency to form so called "banded structure". (2) In-rich layer with the length of several hundred μm was found in front of solid/liquid interface. The length of In-rich layer in downward U.D.S. was twice longer than in upward U.D.S. in each 6 level growth rate, 1-32 mm/h. (3) Influence of growth rate to the interphase spacing between fibrous monotectic In phases reveal no remarkable difference between upward and downward U.D.S.

Original languageEnglish
Pages (from-to)85-91
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume62
Issue number1
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • Aluminum-indium
  • Directional solidification
  • Gravity
  • Monotectic
  • Zone-melting

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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