Accelerated shrinkage of creep cavities by thermal cycling of dispersion-strengthened aluminum

Christopher Schuh*, Bing Qiang Han, David C Dunand

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

High-temperature engineering materials which develop creep cavities in service can be rejuvenated by intermediate annealing, with or without external hydrostatic pressure, to close creep cavities. We report here experimental data of creep cavity shrinkage for dispersion-strengthened-cast aluminum with about 23% submicron Al 2 O 3 dispersoids, annealed isothermally or subjected to thermal cycling without applied stress. We demonstrate that thermal cycling increases the rate of cavity shrinkage relative to isothermal annealing, allowing for recovery of full theoretical density in a shorter time. Isothermal and thermal cycling densification is considered in light of diffusive cavity shrinkage mechanisms, and a simple model considering thermal mismatch stresses is employed to estimate the enhanced rate of densification during thermal cycling.

Original languageEnglish (US)
Pages81-93
Number of pages13
StatePublished - Dec 1 1999
EventAdvanced Materials for the 21st Century: The 1999 Julia R. Weertman Symposium - Cincinnati, OH, USA
Duration: Oct 31 1999Nov 4 1999

Other

OtherAdvanced Materials for the 21st Century: The 1999 Julia R. Weertman Symposium
CityCincinnati, OH, USA
Period10/31/9911/4/99

ASJC Scopus subject areas

  • Engineering(all)

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