| Experimental study of the effect of passes number on material properties deformed by ECAE |
| Paper ID : 1341-UFGNSM-FULL |
| Authors: |
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Jamshid Nemati *1, Gholam Hossein Majzoobi2, Shamsuddin Bin Soulaiman3 1NO. 22 - Roze complex- Paeez Ave. Adib street - Besat SQ. Hamedan - IRAN 2Mechanical Engineering Department, Faculty of Engineering, Bu-Ali Sina University, Hamadan, Iran 3Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM Serdang-Selangor DarulEhsan-Malaysia |
| Abstract: |
| In equal channel angular extrusion (ECAE) method, the grain of the extruded material is significantly refined and its mechanical properties are improved. However, the effect of ECAE is different for different materials and depends largely on the material characteristics and also the test conditions. In this study, the effect of passes number of ECAE on three different materials, including, copper (fcc), aluminum (fcc) and titanium (hcp) is investigated. The annealed pure copper was deformed by ECAE up to 8 passes in ambient temperature. It was found that the maximum increase of ultimate strength was 79% and occurs after the second pass for the velocity of 200 mm/min. The extrusion of aluminum was performed up to 6 passes at the temperature of 200°C. The results indicated that the tensile yield stress and ultimate tensile strength of the extruded specimens increased significantly after 5 passes of ECAE process. The major improvement occurred after the first pass. The extrusion of titanium was performed up to 2 passes at the temperature of 400°C. The results indicated that the tensile yield stress and ultimate tensile strength of the extruded specimens increased significantly after 2 passes of ECAE process. The major improvement occurred after the first pass. It was found that the maximum increase of ultimate strength was 88.7% and occurred after the second pass for the velocity of 0.5 mm/min. It is found that for the major improvement in the properties of the materials occurred after the first or the second pass for the all three materials tested in this work. The effect of the ECAE process on the microhardness of extruded materials after different number of passes has measured according to the standard ASTM E-384 using a Vickers microhardness tester. The results show a significant enhancement in the microhardness of all tested materials. |
| Keywords: |
| Keywords: Equal Channel Angular Extrusion (ECAE) – Pure copper – Al-6063 – Commercially pure titanium – Microhardness – Tensile test |
| Status : Paper Accepted (Poster Presentation) |
