Modification of the Cast Structure in a Cu-12.6 Wt Pct Sn Alloy by Heat Treatment in the Semisolid State

The dendritic structure in a cast Cu-12.6 wt pct Sn alloy can be transformed to a globular structure if the alloy is heat treated in the semisolid range. A Cu-12.6 wt pct Sn alloy has a wide solidification range which encourages the development of a cored dendritic structure during solidification. I...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2015-10, Vol.46 (5), p.2062-2071
Main Authors: Bandyopadhyay, Biswarup, Mishra, Dewika, Bhattacharyya, Ashish, Mallik, Manab
Format: Article
Language:English
Subjects:
Alloys
Casting
Characterization and Evaluation of Materials
Chemistry and Materials Science
Copper
Dendritic structure
Heat treating
Heat treatment
Liquids
Materials Science
Metallic Materials
Microstructure
Nanotechnology
Semisolids
Solid state physics
Spheroidizing
Structural Materials
Surfaces and Interfaces
Thin Films
Tin base alloys
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Summary:The dendritic structure in a cast Cu-12.6 wt pct Sn alloy can be transformed to a globular structure if the alloy is heat treated in the semisolid range. A Cu-12.6 wt pct Sn alloy has a wide solidification range which encourages the development of a cored dendritic structure during solidification. In order to transform it into a globular structure, heat treatment was carried out separately at three temperatures in the semisolid range, namely 1183 K, 1153 K, and 1123 K (910 °C, 880  °C, and 850 °C) with corresponding liquid volume fractions of 50, 40, and 20 pct, respectively. An attempt was made to optimize the temperature and vol pct of liquid combination. It was observed that microstructural modification proceeded mainly through coarsening, fragmentation, and spheroidization of the dendrite arms. Semisolid heat treatment at 1123 K (850 °C) for 2 hours with 20 vol pct liquid yielded the best result. This microstructure was compared with the microstructure developed by solid-state heat treatment at 1023 K (750 °C) for 2 hours. Assessment of the structure–property co-relation demonstrated that hardness, yield stress, ultimate tensile stress, and toughness of the semisolid heat-treated samples were superior to those of subcritically annealed samples.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-015-0382-2