Improving Mechanical Properties of AL 7075 alloy by Equal Channel Angular Extrusion process
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 5
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 size 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 stress 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 Al 7075 alloy with Φ=120◦ die and the outer arc ψ=50◦ was evaluated by optical microscopy.
Authors and Affiliations
Mohan Reddy
Keywords
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