en گروه مکانیکی و شکل دادن Mechanical Performance and Formability of Materials Research Paper Research Paper <div style="text-align: justify;">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 &deg;C. At 300 &deg;C, fine recrystallized structure forms after 10 min which remains stable when the annealing proceeds up to 18 hrs. However, at 350 &deg;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 &deg;C and time up to 300 sec.<br> &nbsp;</div> Ultrafine grain structure, Equal channel angular pressing, AlMg0.7Si, Microstructural instability. 31 39 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-13-9&slc_lang=en&sid=1 A. Eivani aeivani@iust.ac.ir 180031947532846009640 180031947532846009640 Yes School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. S.H. Seyedein 180031947532846009641 180031947532846009641 No School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. M. Aboutalebi 180031947532846009642 180031947532846009642 No School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.