GASAR porous metals process control

J. M. Apprill, D. R. Poirier, M. C. Maguire, T. C. Gutsch

Research output: Contribution to journalConference articlepeer-review

29 Scopus citations


GASAR porous metals are produced by melting under a partial pressure of hydrogen and then casting into a mold that ensures directional solidification. Hydrogen is driven out of solution and usually grows as quasi-cylindrical pores normal to the solidification front. Experiments with pure nickel have been carried out under processing conditions of varying H2 partial pressure, total pressure (H2 + Ar), and superheat. An analysis that considers heterogeneous bubble nucleation was developed that identifies processing conditions in which hydrogen bubbles are stable in the liquid before solidification. It is hypothesized that these conditions lead to low porosity because these bubbles float out of the melt and 'escape' the advancing solidification front. Experimental data are shown to support this hypothesis.

Original languageEnglish (US)
Pages (from-to)291-296
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 1998
EventProceedings of the 1998 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 15 1998Apr 16 1998

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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