|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Continuous Dynamic Recovery in Pure Aluminum Deformed to High Strain by Accumulative Press Bonding
||Sajjad Amirkhanlou, Mostafa Ketabchi, Nader Parvin, Fernando Carreņo
|On-Site Speaker (Planned)
Microstructural evolution and mechanical properties of AA1050 aluminum alloy, prepared by accumulative press bonding, have been investigated by means of sophisticated analytical tools, including STEM and EBSD. The results revealed that continuous dynamic recovery was dominant mechanism in grain refinement, and resulted in formation of nano/ultrafine grains with average diameter of 450 nm in pressing direction and 320 nm in transverse direction. By increasing strain during APB process, the mean misorientation angle and the fraction of high angle boundaries increased and reached a saturation value of ~35˚ and ~78%, respectively. When strain increased during APB process, the tensile strength of the aluminum improved and reached 180 MPa after 14 cycles and the elongation dropped dramatically at the first cycle and then increased slightly. Strengthening in APB processed aluminum was attributed to strain hardening by dislocation accumulation dominant in primary cycles, and grain refinement which was dominant in final cycles.
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