Enhanced densification of cavitated dispersion-strengthened aluminum by thermal cycling

Christopher Schuh; Bing Q. Han; David C. Dunand

doi:10.1007/s11661-000-0209-9

Enhanced densification of cavitated dispersion-strengthened aluminum by thermal cycling

Christopher Schuh, Bing Q. Han, David C. Dunand

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We report experimental data of creep cavity shrinkage for dispersion-strengthened-cast aluminum with about 23 vol pct submicron Al₂O₃ dispersoids, annealed isothermally or subjected to thermal cycling without applied stress. Thermal cycling is found to increase the rate of densification by a factor of 3 to 5.5 relative to isothermal annealing at the upper cycling temperature, allowing for recovery of full theoretical density in a shorter time. Isothermal densification is discussed in light of a diffusive cavity shrinkage mechanism, and a model considering thermal mismatch stresses is employed to rationalize the enhanced rate of densification observed during thermal cycling. Intermittent thermal-cycling densification is shown to improve creep life of dispersion-strengthened aluminum through the suppression of tertiary damage accumulation processes.

Original language	English (US)
Pages (from-to)	2647-2657
Number of pages	11
Journal	Unknown Journal
Volume	31
Issue number	10
DOIs	https://doi.org/10.1007/s11661-000-0209-9
State	Published - 2000

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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10.1007/s11661-000-0209-9

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title = "Enhanced densification of cavitated dispersion-strengthened aluminum by thermal cycling",

abstract = "We report experimental data of creep cavity shrinkage for dispersion-strengthened-cast aluminum with about 23 vol pct submicron Al2O3 dispersoids, annealed isothermally or subjected to thermal cycling without applied stress. Thermal cycling is found to increase the rate of densification by a factor of 3 to 5.5 relative to isothermal annealing at the upper cycling temperature, allowing for recovery of full theoretical density in a shorter time. Isothermal densification is discussed in light of a diffusive cavity shrinkage mechanism, and a model considering thermal mismatch stresses is employed to rationalize the enhanced rate of densification observed during thermal cycling. Intermittent thermal-cycling densification is shown to improve creep life of dispersion-strengthened aluminum through the suppression of tertiary damage accumulation processes.",

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AU - Schuh, Christopher

AU - Han, Bing Q.

AU - Dunand, David C.

PY - 2000

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N2 - We report experimental data of creep cavity shrinkage for dispersion-strengthened-cast aluminum with about 23 vol pct submicron Al2O3 dispersoids, annealed isothermally or subjected to thermal cycling without applied stress. Thermal cycling is found to increase the rate of densification by a factor of 3 to 5.5 relative to isothermal annealing at the upper cycling temperature, allowing for recovery of full theoretical density in a shorter time. Isothermal densification is discussed in light of a diffusive cavity shrinkage mechanism, and a model considering thermal mismatch stresses is employed to rationalize the enhanced rate of densification observed during thermal cycling. Intermittent thermal-cycling densification is shown to improve creep life of dispersion-strengthened aluminum through the suppression of tertiary damage accumulation processes.

AB - We report experimental data of creep cavity shrinkage for dispersion-strengthened-cast aluminum with about 23 vol pct submicron Al2O3 dispersoids, annealed isothermally or subjected to thermal cycling without applied stress. Thermal cycling is found to increase the rate of densification by a factor of 3 to 5.5 relative to isothermal annealing at the upper cycling temperature, allowing for recovery of full theoretical density in a shorter time. Isothermal densification is discussed in light of a diffusive cavity shrinkage mechanism, and a model considering thermal mismatch stresses is employed to rationalize the enhanced rate of densification observed during thermal cycling. Intermittent thermal-cycling densification is shown to improve creep life of dispersion-strengthened aluminum through the suppression of tertiary damage accumulation processes.

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Enhanced densification of cavitated dispersion-strengthened aluminum by thermal cycling

Abstract

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