Stress-strain response of a cast 319-T6 aluminum under thermomechanical loading

Huseyin Sehitoglu, Xinlin Qing, Tracy Smith, Hans J. Maier, J. A. Allison

Research output: Contribution to journalArticlepeer-review


The stress-strain behavior of cast 319-T6 aluminum-copper alloys with three different secondary dendrite arm spacings (SDASs) was studied at high temperatures and under thermomechanical deformation, exposing marked cyclic softening. A two state-variable unified inelastic constitutive model proposed earlier was modified to describe the stress-strain responses of these alloys by considering the variation of hardening and recovery functions of back-stress and drag stress. The SDAS was incorporated in the model as a length-scale parameter, and the material constants were determined systematically from experiments on a cast 319-T6 aluminum with small and large SDASs. The capabilities of the constitutive model were checked by the comparisons of simulations to experiments in the small-strain regime (<0.005). The results show that the model provides successful simulations for material response after thermal exposure at high temperature and cyclic transient stress-strain behavior. The causes of mechanical behaviors at the macro scale are discussed based on microstructural changes during thermal exposure.

Original languageEnglish (US)
Pages (from-to)139-151
Number of pages13
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number1
StatePublished - 2000

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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