Improving Mechanical Properties of AL 7075 （7075年阿尔改善力学性能）.pdf

International Journal of Modern Engineering Research (IJMER) Vol. 3, Issue. 5, Sep - Oct. 2013 pp-2713-2716 ISSN: 2249-6645 Improving Mechanical Properties of AL 7075 alloy by Equal Channel Angular Extrusion process 1 1 2 Preparation of Papers for International Journal of Modern Mohan Reddy , Santhosh Kumar M , Venkata Ajay Kumar G 1(Department of Mechanical Engineering,KSRM College of Engineering / JNT University, Annatapur, India) Engineering and Research (16 Bold) 2 (Department of Mechanical Engineering,Sri Venkateswara Institute of Science and Technology / JNT University, Annatapur, India) ABSTRACT : The influence of the microstructure and the tensile properties is investigated in specimens of ultrafine- grained materials processed by equal channel angular extrusion (ECAE) through route A, to refine grain s ize of 7075 AL alloy this was attempted at room temperature. Sub-grains/cells increases and the width of boundaries decrease while the cell/sub-grain size remains approximately constant as the number of passes increases. Yield stress and ultimate tensile s tress reach a maximum after four passes. This study shows that severe plastic deformation has potential to significantly improve the mechanical properties of Al alloys. Static annealing experiments demonstrated that the extensive grain growth occurs at can be achieved after the age hardened treatment before that solution heat treatment at 480°C for 1 hour followed by age hardening at 177°C for 8 hours. Microstructure evolution during repetitive equal-channel angular extrusion (ECAE) of