|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Effect of Addition of Mn and Cr on Precipitation Behavior of Dispersoids in Al-Mg-Si-Cu Alloy
||Hiromi Nagaumi, Han Yi, Tongguang Zhai, Guo Shijie
|On-Site Speaker (Planned)
The precipitation behavior of dispersoids containing Mn and Cr in Al-Mg-Si-Cu alloy during homogenization annealing was investigated by means of TEM, SEM and EBSD. The addition of Mn increased the length/width ratio of the dispersoids and atomic ratio of Mn/Cr during homogenization annealing, leading to the morphology of dispersoids changed from square to rod-like shape. These dispersoids could effectively inhibit recrystallization by pinning dislocations and reduce the recrystallization fraction with the addition of Mn and Cr. As for the examined alloy with high Mn content up to 0.8wt.%, the recrystallization fraction after solution treatment reduced from 28.2% to 7.7%. During the homogenization annealing of Al-Mg-Si-Cu alloy, Q’-AlMgSiCu phase was precipitated at first. With the increase of the temperature, the Mn-containing dispersoids were observed to nucleate preferentially on the Q’-AlMgSiCu phase followed by participation of Cr in the formation of the dispersoids containing Mn and Cr.
||Planned: Light Metals