Effect of Melt Intensive Homogenization on Solidification Microstructure of 7075 Aluminium Alloy by Twin-Screw Stirring

Zhi Hua Gao; Jun Xu; Guo Jun Liu; Zhi Feng Zhang; Men Gou Tang; Shao Ming Zhang; Z. Fan

doi:10.4028/www.scientific.net/AMR.750-752.771

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 750-752Effect of Melt Intensive Homogenization on...

Effect of Melt Intensive Homogenization on Solidification Microstructure of 7075 Aluminium Alloy by Twin-Screw Stirring

Abstract:

Intensive melt shearing achieved using a twin-screw machine was applied to the 7075 aluminum alloy melt to investigate its effects on grain refinement. Alloy melt without and with melt shearing was cast in the standard test procedure mould, and the effects of casting temperature, shearing time and shearing intensity on microstructures were analyzed. The results show that the intensive melt shearing exhibits superior grain refinement and remarkable structure homogeneity. Without shearing, the grain size increases significantly with the increase in pouring temperature, while with intensive melt shearing the grain size is finer at all the pouring temperatures tested with a reduced grain size dependence on the pouring temperature. With the shearing time or shearing intensity increasing, the grain size of the equiaxed primary α (Al) phase decreases on the sample microstructures, and the grain distributions trend to become more fine and non-dendritical.

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Periodical:

Advanced Materials Research (Volumes 750-752)

Pages:

771-775

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.750-752.771

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Online since:

August 2013

Authors:

Zhi Hua Gao, Jun Xu, Guo Jun Liu, Zhi Feng Zhang, Men Gou Tang, Shao Ming Zhang, Z. Fan

Keywords:

7075 Aluminum Alloy, Melt Intensive Homogenization, Microstructure, rheoforming

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