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The effects of Cr and Cr/Mn combined additions on the semi-solid microstructure of wrought Al-Mg-Si alloys are investigated.In the Cr-added alloy,the Al_7Cr compound is formed with homogeneously distributed in theα-Al matrix after homogenization.Both of the Al_7Cr andα-Al_(12)Mn3_Si_2 dispersiod particles are found in the homogenized microstructure of the Cr/Mn-added alloy.In the semi-solid microstructures,the smallestα-Al grains are obtained in the 60% cold-rolled alloys.After prolonged holding time,theα-Al grain size of the Cr/Mn-added alloy is smaller than that of the Cr-added alloy.Heavy deformation by cold-rolling accelerates spheroidization of theα-Al grains.The D-SSF process is found to be useful to modify the microstructures of both the Cr-added and Cr/Mn-added Al-Mg-Si alloys.
The effects of Cr and Cr / Mn combined additions on the semi-solid microstructure of wrought Al-Mg-Si alloys are investigated. The Cr-added alloy, the Al_7Cr compound is formed with homogeneously distributed in the α-Al matrix after homogenization. Both of the Al_7Cr and α-Al_ (12) Mn3_Si_2 dispersiod particles are found in the homogenized microstructure of the Cr / Mn-added alloy. In the semi-solid microstructures, the smallest α-Al grains are obtained in the 60% cold-rolled alloys . After prolonged holding time, the α-Al grain size of the Cr / Mn-added alloy is smaller than that of the Cr-added alloy. Heavy deformation by cold-rolling accelerates spheroidization of the α-Al grains. The D-SSF process is found to be useful to modify the microstructures of both the Cr-added and Cr / Mn-added Al-Mg-Si alloys.