Structural Evolution in Aluminium Alloy AA6082 during HPT Deformation at Increased Temperature

• Published in: AIP conference proceedings 2012-03
• Main Authors: Zrnik, Jozef, Kraus, Libor, Pippan, Reinhard, Fujda, Martin, Sperlink, Karel
• Format: Article
• Language: English
• ISSN: 0094-243X

Aluminium alloy AA6082 of different initial structure was deformed by HPT at increased temperature of 150 degree C. The impact of various effective strain eef and temperature on fine grain structure evolution and mechanical properties was investigated. The refinement of coarse initial alloy structure, modified by thermal treatment performed prior deformation, was investigated using TEM of thin foils respecting the effect of different shear strain across the disc. The tensile tests and microhardness were performed with aim to evaluate mechanical properties changes as effect of straining. The torque versus number of turns was measured as well. The microstructure results showed that ultrafine grained structure was formed across the disc applying the first turn. Effectively homogenized ultrafine grained structure across the disc was attained. Tensile test results showed that effect of deformation strengthening was increasing as effective stress increased. The hardness results pointed out to the reverse dependence of strength across the disc.