Effect of Heat Treatment on Microstructure of Continuous Unidirectional Solidified Cu–Ni–Sn Alloy
Cu–15%Ni–8%Sn alloy was prepared by continuous unidirectional solidification (CUS) processing and the as-cast CUS Cu–15%Ni–8%Sn alloy was homogenized. The evolution of microstructure and composition distribution of as-cast and annealed CUS Cu–15%Ni–8%Sn alloy was analyzed. The results show that the microstructure of as-cast CUS Cu–15%Ni–8%Sn is mainly composed of coarse columnar grains and there exist segregation phenomenon in the grain boundaries. After annealing at temperature of 850°C for 30 min, it was found that the composition of the alloy began to become uniform and the solutes gathered at the grain boundaries diffused into the columnar grains.
KeywordsCu–Ni–Sn alloy Continuous unidirectional solidification Microstructures Annealing
This work was supported by the project of Yangtze Normal University (2017KYQD130).
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