Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 531, Issue -, Pages 35-44Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.09.115
Keywords
AA6082; Creep; Dislocation climb; Microstructure; Precipitation hardening; Subgrains
Categories
Funding
- Center of Excellence for Research in Engineering Materials (CEREM), College of Engineering, King Saud University, Riyadh, Saudi Arabia
- Egyptian Scientific Missions
- National Science Foundation [DMR-0702978]
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Creep characteristics of nano-particle strengthened AA6082 (Al-Mg-Si) alloy via precipitation hardening were investigated over five orders of magnitude of strain rates. The experimental data showed that the apparent creep behavior of AA6082 differed from that of pure Al with regard to two primary features: the apparent stress exponent, n(a), is about 7 and the apparent activation energy for creep (206 kJ/mol) is higher than that for self-diffusion (142 kJ/mol). An examination of the data revealed a threshold stress whose temperature dependence is much stronger than that attributable to the shear modulus. Evidence based on transmission electron microscopy (TEM) investigation indicated that the origin of the threshold stresses was related to the interaction of dislocations with second phase particles, which were identified as Mg2Si. By incorporating the threshold stress into creep analysis, it was demonstrated that the true creep behavior of AA6068 was consistent with that ascribable to high-temperature climb and that the alloy was more creep resistant than Al. (C) 2011 Elsevier B.V. All rights reserved.
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