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Metallurgical Interface of 7075/6061 Bimetallic Composite Ingot Casted by Semi-Solid Slurry and Molten Metal Pouring

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Abstract:

The 7075/6061 bimetallic composite ingots were prepared by semi-solid/liquid method. The microstructure characteristics of composite ingots were studied, and the diffusion law of interface components was analyzed. The results show that the semi-solid/liquid composite of 7075 and 6061 can be realized under the conditions of casting temperature of 983 K, semi-solid heating temperature of 918 K, holding time of 1h, and rapid water cooling. The obtained composite ingot has a layered distribution characteristic of "semi-solid microstructure/dendritic structure". The interface is clear, continuous, and free of impurities. From the interface to the semi-solid side, it shows such a pattern of change: “Dendritic structure” →”Semidendritic and hemispherical” → “Globularization”. Through the observation of the microstructure and the analysis of the components, the semi-solid/liquid composite mechanism is discovered to be a combination of fusion bonding and diffusion bonding.

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Periodical:

Solid State Phenomena (Volume 285)

Pages:

326-332

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.285.326

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Online since:

January 2019

Authors:

Xiao Ping Zheng*, Long Jiang, Hong Bin Li, Ya Qiang Tian, Lian Sheng Chen

Keywords:

6061 Aluminum Alloy, 7075 Aluminum Alloy, Interfacial Composition, Interfacial Structure, Semi-Solid/Liquid Composite Casting

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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