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On the role of cooling and tool rotational direction on microstructure and mechanical properties of friction stir processed AZ91 |
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| Authors: | P Asadi M K Besharati Givi N Parvin A Araei M Taherishargh S Tutunchilar |
| Affiliation: | 1. Department of Mechanical Engineering, Tehran Central Branch, Islamic Azad University, Tehran, Iran 5. School of Mechanical Engineering, College of Engineering, University of Tehran, Kargarshomali St, Tehran, Iran, P.O. Box 11155/4563 2. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran 3. School of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran 4. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran |
| Abstract: | This paper deals with an experimental investigation focused on the effects of water cooling treatment, friction stir processing pass number, and tool rotational direction on the microstructure and mechanical properties of friction stir processed AZ91 magnesium alloy. Specimens were produced using different combinations of process parameters. Parallel to increasing the amount of oxide particles in the processed area, water cooling was found to reduce the final grain size and enhance their hardness and strength. Changing the rotational direction in each pass reduces the grain size severely (from 150 to ~4?μm) and increases the hardness (from 63 to 98?HV) and strength (from ~130 to ~250?MPa). However, no significant difference was found in wear resistance of the specimens produced with different process parameters. |
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