Composition variations induced by g-jitter in Bridgman growth of Sn-Bi alloys in microgravity

Academic Article

Abstract

  • This work is a detailed analysis of the experimental data on g-jitter effects on solute segregation during directional solidification of tin-bismuth alloys. The experiments were carried out under microgravity conditions within the framework of the MEPHISTO programme. The MEPHISTO data from the USMP-3 space flight mission represented the first quantitative data on g-jitter effects on a directional solidification experiment that were obtained under well-defined conditions The growth conditions and the results of previous numerical simulations are briefly recalled, along with the predictions of an analytical model for both the g-jitter induced composition variations and the time necessary to get back to steady state conditions. The feasibility of various mitigation strategies, aiming at counterbalancing the deleterious effect of the g-jitters is also discussed. It is concluded that the ability of numerical modelling to provide reliable predictions of g-jitter effects for the interpretation and planning of future space experiments is still limited by a lack of well-documented experimental results that can be used for verification. © 2001 Elsevier Science B.V.
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Garandet JP; Alexander JID; Corre S; Favier JJ
  • Start Page

  • 543
  • End Page

  • 554
  • Volume

  • 226
  • Issue

  • 4