Effects of holding stress,temperature, and time in strain aging on flow curves of 5083-O aluminum alloy plate

Abstract

It is well known that a strain aging was effective technique for a prevention of a strain marking in steel materials, whereas there are few reports on aluminum alloys on this issue. In the previous study, strain aged 5083 aluminum alloy plates were tensile deformed in order to investigate the effect of strain aging temperature and time on a generation of a stress fluctuation resulted in the strain marking. The findings suggested that a generation of stress fluctuation was affected not only by the strain aging temperature and time but also by the holding stress, which was applied to a specimen during the strain aging. In the present study, therefore, the strain aging in a wide range of holding stress was carried out, and the effect of holding stress on a generation of stress fluctuation was investigated. In addition, the influence of temperature, time, and holding stress during the strain aging on a generation of stress fluctuation was discussed in detail. Experimental results showed that the stress fluctuation tended to generate with increasing the holding stress. When the specimens were strain aged at the holding stress that corresponded to the flow stress when deformation was interrupted, the stress fluctuation that had been generated in a short aging time disappeared clearly as aging time extended.