Effect of Rare Earth Microalloying on the Microstructure and Properties of Cu-2Ag Alloy as Cast
Rare earth microalloyed Cu-2Ag alloy ingots were prepared by vacuum induction melting method.The influence and mechanism of rare earth Y and La microalloying on the microstructure and properties of Cu-2Ag alloy ingots were studied through microstructure observation,selected zone composition analysis,Vickers hardness and conductivity properties testing.The results showed that adding rare earth Y or La to Cu-2Ag alloy ingots could significantly refine the grain size,significantly reduce the proportion of columnar grains,increase the proportion of equiaxed grains,suppress the segregation of silver rich phases at grain boundaries in the ingot,and promote the uniform spherical precipitation of silver rich phases at grain boundaries,thereby improving the morphology and distribution of silver rich phases in the Cu-2Ag alloy in-gots.Compared with Cu-2Ag alloy ingots,the hardness and electrical conductivity of Cu-2Ag-0.075Y and Cu-2Ag-0.075La alloy ingots had increased by 4.43％and 4.72％,respectively.At the same time,the performance distribution of the ingot was more uniform.
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