Effect of cold rolling on bending and tensile behavior of 7075 aluminum alloy

Abstract

The present study reports the effect of cold working on bending and tensile behavior of 7075 Al alloy. A series of experiments involving cold rolling (58% cold work) have been conducted for the 7075-O aluminum alloy. It has been shown that cold rolling has a significant effect on increasing the yield strength and decreasing ductility of alloy. The variation in alloy ductility was found to correlate well with the fractography results of the tensile and bending tested specimens. The SEM fractographs of fractured surfaces for cold rolled specimens can be show very clearly the ductile to brittle transition behavior (absence of dimples) in bending test. It has been shown that, 7075-O aluminum alloy before cold rolling exhibits excellent bend properties so that, it is capable of being bent cold around a pin under high angle without crack or fracture, due to ductile behavior. Also, it can be seen that surface quality of starting materials is better than of cold rolled samples. © 2009 Asian Network for Scientific lnformation.