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Title

A study on the sub-structure and mechanical properties of friction stir processed AA ۶۰۶۱-T۶ joints with ultra-fine grained structure

فصلنامه مواد پیشرفته و فرآوری، دوره: 2، شماره: 1
Year: 1393
COI: JR_JMATPR-2-1_005
Language: EnglishView: 33
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Authors

Ali Salemi Golezani - Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran.
M. Esmaily - Department of Chemical and Biological Engineering, Chalmers University of Technology, Göteborg, Sweden.
N. Mortazavi - Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.

Abstract:

Ultra-fine grained (UFG) structure (~۰.۶ µm) was produced in the stir zone (SZ) of ۶۰۶۱-T۶ aluminum alloy joints using friction stir processing (FSP) cooled by liquid nitrogen (N۲). A new experimental set-up was used to simultaneously quench the lower and upper surfaces of the samples during the processing. In addition, FSPed joints, using a steel backing plate, were produced at room temperature as a reference. Sub-structural studies have been carried out to investigate the occurrence of dynamic recrystallization and grain growth in the weld area of the samples. The results indicate that the microstructure was not fully recrystallized as a high dislocation density (۳.۵×۱۰۱۴ m-۲) was measured in the stir zone (SZ) of rapidly cooled joints in compare with that of the air-cooled joints (۱.۵×۱۰۱۴ m-۲). Moreover, the rapid cooling generated a very high dislocation density of about ۶.۵×۱۰۱۴ m-۲ in the thermo-mechanical affected zone (TMAZ). Accordingly, better mechanical properties were obtained in the SZ. In contrast, lower strain hardening capacity and hardening exponent values were obtained in the rapidly cooled joints where the highest fraction of low angle grain boundaries (LAGBs) and largest number of dislocations were measured.

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This Paper COI Code is JR_JMATPR-2-1_005. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1282660/

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Salemi Golezani, Ali and Esmaily, M. and Mortazavi, N.,1393,A study on the sub-structure and mechanical properties of friction stir processed AA ۶۰۶۱-T۶ joints with ultra-fine grained structure,https://civilica.com/doc/1282660

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