TY - JOUR

T1 - Precipitate effects on the mechanical behavior of aluminum copper alloys

T2 - Part I. Experiments

AU - Sehitoglu, H.

AU - Foglesong, T.

AU - Maier, H. J.

N1 - Funding Information: The work was partially sponsored by the Ford Motor Company (Dearborn, MI); the Fracture Control Program, University of Illinois; and the National Science Foundation (Grant No. DMR-0313489). The Frederick Seitz Materials Research Laboratory facilities, supported by US Dept. of Energy Grant DEF 02-91ER45439, were utilized in ‘texture’ portion of the work. The authors acknowledge discussions with C. Tome on the VPSC code modification (Part II), and Professor A. Beaudoin, University of Illinois, Urbana, on texture effects.

PY - 2005

Y1 - 2005

N2 - This article focuses on understanding the mechanical behavior of precipitation-hardened alloys by studying single and polycrystalline deformation behavior with various heat treatments. Aluminumcopper alloys are the focus in this work and their changing stress-strain behavior is demonstrated resulting from the different hardening mechanisms brought about by the various precipitates. Extensive transmission electron microscopy investigations facilitated the interpretation of the stress-strain behavior and the work hardening characteristics. The use of both single and polycrystals proved valuable in understanding the role of anisotropy due to crystal orientation vs precipitate-induced anisotropy. The experiments show that precipitation-induced anisotropy could offset the crystal orientation anisotropy depending on the orientation. This is clearly demonstrated with similar [111] and [123] behaviors under 190 °C and 260 °C aging temperatures. Experiments on pure aluminum crystals are also provided for comparison and understanding the crystal anisotropy in the absence of precipitates. Part I of this article will focus on experiments, and part II will describe the modeling of the effect of different metastable phases in the matrix acting as barriers to dislocation motion.

AB - This article focuses on understanding the mechanical behavior of precipitation-hardened alloys by studying single and polycrystalline deformation behavior with various heat treatments. Aluminumcopper alloys are the focus in this work and their changing stress-strain behavior is demonstrated resulting from the different hardening mechanisms brought about by the various precipitates. Extensive transmission electron microscopy investigations facilitated the interpretation of the stress-strain behavior and the work hardening characteristics. The use of both single and polycrystals proved valuable in understanding the role of anisotropy due to crystal orientation vs precipitate-induced anisotropy. The experiments show that precipitation-induced anisotropy could offset the crystal orientation anisotropy depending on the orientation. This is clearly demonstrated with similar [111] and [123] behaviors under 190 °C and 260 °C aging temperatures. Experiments on pure aluminum crystals are also provided for comparison and understanding the crystal anisotropy in the absence of precipitates. Part I of this article will focus on experiments, and part II will describe the modeling of the effect of different metastable phases in the matrix acting as barriers to dislocation motion.

UR - http://www.scopus.com/inward/record.url?scp=41249090412&partnerID=8YFLogxK

U2 - 10.1007/s11661-005-1006-2

DO - 10.1007/s11661-005-1006-2

M3 - Article

AN - SCOPUS:41249090412

VL - 36

SP - 749

EP - 761

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 - 13

ER -