GASAR porous metals process control

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

28 Citations (Scopus)

Abstract

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)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsD.S. Schwartz, D.S. Shih, A.G. Evans, H.N.G. Wadley
PublisherMRS
Pages291-296
Number of pages6
Volume521
StatePublished - 1998
EventProceedings of the 1998 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 13 1998Apr 15 1998

Other

OtherProceedings of the 1998 MRS Spring Symposium
CitySan Francisco, CA, USA
Period4/13/984/15/98

Fingerprint

Process control
Solidification
Metals
Hydrogen
Partial pressure
Processing
Nickel
Bubbles (in fluids)
Casting
Melting
Nucleation
Porosity
Liquids
Experiments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Apprill, J. M., Poirier, D. R., Maguire, M. C., & Gutsch, T. C. (1998). GASAR porous metals process control. In D. S. Schwartz, D. S. Shih, A. G. Evans, & H. N. G. Wadley (Eds.), Materials Research Society Symposium - Proceedings (Vol. 521, pp. 291-296). MRS.

GASAR porous metals process control. / Apprill, J. M.; Poirier, David R; Maguire, M. C.; Gutsch, T. C.

Materials Research Society Symposium - Proceedings. ed. / D.S. Schwartz; D.S. Shih; A.G. Evans; H.N.G. Wadley. Vol. 521 MRS, 1998. p. 291-296.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Apprill, JM, Poirier, DR, Maguire, MC & Gutsch, TC 1998, GASAR porous metals process control. in DS Schwartz, DS Shih, AG Evans & HNG Wadley (eds), Materials Research Society Symposium - Proceedings. vol. 521, MRS, pp. 291-296, Proceedings of the 1998 MRS Spring Symposium, San Francisco, CA, USA, 4/13/98.
Apprill JM, Poirier DR, Maguire MC, Gutsch TC. GASAR porous metals process control. In Schwartz DS, Shih DS, Evans AG, Wadley HNG, editors, Materials Research Society Symposium - Proceedings. Vol. 521. MRS. 1998. p. 291-296
Apprill, J. M. ; Poirier, David R ; Maguire, M. C. ; Gutsch, T. C. / GASAR porous metals process control. Materials Research Society Symposium - Proceedings. editor / D.S. Schwartz ; D.S. Shih ; A.G. Evans ; H.N.G. Wadley. Vol. 521 MRS, 1998. pp. 291-296
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