Large-strain torsional deformation in aluminum at elevated temperatures

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1989-02, Vol.108 (1-2), p.45-61
• Main Authors: Kassner, M.E., Myshlyaev, M.M., McQueen, H.J.
• Format: Article
• Language: English
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/0921-5093(89)90405-X

A substantial amount of work has been produced recently in the area of large-strain deformation of aluminum at elevated temperatures using torsion tests. These studies have generated much interest because the equivalent uniaxial strain to failure of the aluminum can exceed 100, depending on the purity, strain rate and temperature. The research in this area has been performed principally by four groups and reported largely in less-circulated journals, proceedings and reports. The following review of the subject was written by three representatives from these groups. Emphasis was on establishing areas of substantial agreement as well as delineating aspects where further work will be helpful. The review is divided into two principal sections: macroscopic phenomenology and microstructural observations. The first includes discussions of ductility, stress-strain relationships and constitutive equations. The second includes discussions of grain elongation and thinning and grain boundary serration, subgrain sizes and morphologies, dislocation density, and subgrain boundary misorientation angles, as well as texture analysis. These investigations provide insight into the large-strain mechanical and microstructural phenomenology of materials in which elevated temperature softening proceeds by dynamic recovery.