TY - JOUR

T1 - Stress-strain response of a cast 319-T6 aluminum under thermomechanical loading

AU - Sehitoglu, Huseyin

AU - Qing, Xinlin

AU - Smith, Tracy

AU - Maier, Hans J.

AU - Allison, J. A.

N1 - Funding Information: This work is supported by Ford Motor Company. Paula Reeber is thanked for providing her unpublished thermal exposure results. Mr. John Lasecki, Ford, assisted with the preparation of the material and a portion of the isothermal test program at Westmoreland and Metcut. The TEM investigations were completed at the Center for Micro Analysis of Materials at the University of Illinois funded by the Department of Energy under Grant No. DEFG 02 91-ER45439.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0033893353&partnerID=8YFLogxK

U2 - 10.1007/s11661-000-0060-z

DO - 10.1007/s11661-000-0060-z

M3 - Article

AN - SCOPUS:0033893353

VL - 31

SP - 139

EP - 151

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

SN - 1073-5623

IS - 1

ER -