Using ring samples to evaluate the processing characteristics in high-pressure torsion

✍ Scribed by Yosuke Harai; Kaveh Edalati; Zenji Horita; Terence G. Langdon

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 502 KB
• Volume: 57
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.10.046

✦ Synopsis

An Al-3% Mg-0.2% Sc alloy was processed by high-pressure torsion (HPT) using samples in the form of solid disks and rings. Following HPT, all values of the measured Vickers microhardness fall onto a single curve when plotted against the equivalent strain, such that there are increasing values of hardness at the lower strains and hardness saturation above equivalent strains of $40. This saturation level is independent of the number of revolutions and the applied pressure. The grain size following HPT is $220 nm, and tensile tests show that the material is superplastic at a testing temperature of 573 K.