Thermo-mechanical deformation of A1319 - T7B with small secondary dendrite arm spacing

Huseyin Sehitoglu, Tracy J. Smith, Hans J. Maier

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


Thermomechanical fatigue and isothermal deformation experiments were conducted on cast Al 319 alloys with small secondary arm spacings (SDAS) in the range of 25 to 35 μm. The alloy was studied in the overaged state designated as T7B. In the case of the T7B treatment the material possesses dimensional stability, but incurs considerable loss of strength with time and cyclic deformation at temperatures exceeding 250°C. A two-state variable unified constitutive model was developed to characterize the stress-strain response for the material. The model handles temperature and strain rate effects and captures the microstructurally induced changes on the stress-strain response. The thermomechanical fatigue response under in-phase (TMF IP) and out-of-phase (TMF OP) conditions was simulated and the material exhibited a decrease in the stress range by as much as 50% with continued cycling. The decrease in strength was attributed to the significant coarsening of the precipitates at high temperatures and was confirmed by transmission electron microscopy.

Original languageEnglish (US)
Title of host publicationASTM Special Technical Publication
Number of pages16
ISBN (Print)0803128533
StatePublished - 2000
EventThe Symposium of 'Thermo-Mechanical Fatigue Behavior of Materials: Third Volume' - Norfolk, VA, USA
Duration: Nov 4 1998Nov 5 1998

Publication series

NameASTM Special Technical Publication
ISSN (Print)1040-3094


OtherThe Symposium of 'Thermo-Mechanical Fatigue Behavior of Materials: Third Volume'
CityNorfolk, VA, USA

ASJC Scopus subject areas

  • Engineering(all)


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