TY - JOUR

T1 - Thermo-mechanical fatigue behavior of cast 319 aluminum alloys

AU - Engler-Pinto, C. C.

AU - Sehitoglu, Huseyin

AU - Maier, H. J.

AU - Foglesong, T. J.

N1 - Funding Information: The authors would like to thank Dr. John E. Allison and John V. Lasecki, from Ford Research Laboratory, Dearborn, for their support of this research. Dr. Carlos Engler-Pinto is also grateful to Fundaqao de Amparo a Pesquisa do Estado de Sao Paulo - FAPESP, Sao Paulo, Brazil, for the partial post-doctoral fellowship granted. Some of the isothermal tests were conducted at Westmoreland Laboratory and AMTEL. The SEM investigations were completed at the Center for Microanalysis of Materials at the University of Illinois, which is supported by the United States Department of Energy under Grant No. DEFG02-9I-ER45439.

PY - 2002

Y1 - 2002

N2 - Stress-strain behavior and durability of cast 319 aluminum-copper alloys are studied at high temperatures and under thermo-mechanical fatigue (TMF), exposing rate sensitivity and microstructural changes. The decrease in strength during cycling was attributed to the significant coarsening of the precipitates at high temperatures, which was confirmed with transmission electron microscopy. The results show that the stress-strain response is similar under out-of-phase (OP) and in-phase (IP) thermo-mechanical fatigue. However, TMF-IP fatigue lives are substantially lower compared to TMF-OP lives, which are very close to the isothermal low cycle fatigue (LCF) life obtained at a similar inelastic strain range. In fact, it is observed that TMF IP loading induces significant creep damage, while transgranular fracture predominates in all other testing conditions.

AB - Stress-strain behavior and durability of cast 319 aluminum-copper alloys are studied at high temperatures and under thermo-mechanical fatigue (TMF), exposing rate sensitivity and microstructural changes. The decrease in strength during cycling was attributed to the significant coarsening of the precipitates at high temperatures, which was confirmed with transmission electron microscopy. The results show that the stress-strain response is similar under out-of-phase (OP) and in-phase (IP) thermo-mechanical fatigue. However, TMF-IP fatigue lives are substantially lower compared to TMF-OP lives, which are very close to the isothermal low cycle fatigue (LCF) life obtained at a similar inelastic strain range. In fact, it is observed that TMF IP loading induces significant creep damage, while transgranular fracture predominates in all other testing conditions.

KW - cast aluminum

KW - fracture mechanism

KW - microstructural coarsening

KW - stress-strain response

KW - Thermo-mechanical fatigue

UR - http://www.scopus.com/inward/record.url?scp=77957074469&partnerID=8YFLogxK

U2 - 10.1016/S1566-1369(02)80057-7

DO - 10.1016/S1566-1369(02)80057-7

M3 - Article

AN - SCOPUS:77957074469

VL - 29

SP - 3

EP - 13

JO - European Structural Integrity Society

JF - European Structural Integrity Society

SN - 1566-1369

IS - C

ER -