| Comparing Two Different Extrusion Temperatures and the Resulted Fine Grain Microstructures of Al7075 |
| Paper ID : 2520-UFGNSM13-FULL |
| Authors: |
|
Masood Rezaii1, Seyed Mohammad Hasan Pishbin2 1School of Mechanical Engineering, University of Maleke Ashtar, Tehran, Iran 2Metallurgical and Material Since Engineering Dep., University of Tehran |
| Abstract: |
| In this work, Al7075 was extruded in two different temperature ranges, 400-430 °C and 470-490 °C. The former range which is normally used in industry creates a high degree of anisotropy and elongated grains. But the later range is a good option for refining grains to 5 µm, and getting an isotropic fracture behavior. Although both ranges are high enough to call them hot deformation. The differences are due to the elimination of precipitates such as MgZn2, Al2Cu, and CuMgAl2 at the temperature of 480 °C and above. Therefore dynamic recrystalization mechanism is activated, and fine grains are nucleated. By decreasing the temperature lower than 480°C, the precipitates are nucleated on the boundaries, and stop grain growth. |
| Keywords: |
| 7075 Aluminum, Aluminum Extrusion, Grain Refinement |
| Status : Paper Accepted (Poster Presentation) |
© 2010 - 2024 All Rights Reserved. Powered by sinaweb.