Effect of Equal Channel Angular Pressing and Annealing Treatment on the Evolution of Microstructure in AlMg0.7Si Aluminum Alloy

• Main Authors: A. Eivani, S.H. Seyedein, M. Aboutalebi
• Format: Article
• Language: English
• Published: Iran University of Science & Technology 2018-03-01
• Series: Iranian Journal of Materials Science and Engineering
• Subjects: Ultrafine grain structure; Equal channel angular pressing; AlMg0.7Si; Microstructural instability.
• Online Access: http://ijmse.iust.ac.ir/browse.php?a_code=A-10-13-9&slc_lang=en&sid=1

In this research, samples of AlMg0.7Si aluminum alloy are deformed up to three passes using equal channel angular pressing (ECAP). Formation of a sub-micron structure after three passes of ECAP is demonstrated. Microstructural stability of the samples is investigated at temperatures of 300-500 °C. At 300 °C, fine recrystallized structure forms after 10 min which remains stable when the annealing proceeds up to 18 hrs. However, at 350 °C and higher, the microstructure is quite unstable. Even by 10 sec annealing, the samples exhibit recrystallized structure which turned to abnormal grain growth when temperature enhances to 500 °C and time up to 300 sec.