Hot formability of 7085 aluminum alloy based on processing map

Based on the heat processing technology of 7085 aluminum alloy aircraft parts, 7085 aluminum alloy in the temperature range of 300~450°C and strain rate range of 0.0001~1 s-1 have been studied by hot compressing testing. Processing map of 7085 aluminum alloy was generated and hot formability was analyzed. The results demonstrate that the temperature range of 340~450°C and strain rate range of 0.0001~1 s-1 is the processing safety area for hot deformation of the 7085 aluminum alloy. The flow instability region occurs in the temperature range from 300°C to 340°C and strain rate range from 0.01 s-1 to 1 s-1. The adiabatic shear bands are generated when 7085 aluminum alloy is deformed in the flow instability region. The structure of adiabatic shear banding is violently elongated grain. The potential processing dangerous area is in the temperature range from 300°C to 340°C and strain rate range from 0.0001 s-1 to 0.01 s-1. The optimal deformation processing parameters are the deformation temperatures ranging from 340°C to 410°C and strain rates ranging from 0.0004 s-1 to 1 s-1. Copyright © 2013, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.