Influence of Pre-annealing Temperature on Microstructure Evolution and Mechanical Properties of Semi-solid Copper Alloy Billet
The as-cast CuSn10P1 copper alloy was pre-annealed and then prepared into semi-solid billets by cold rolling isothermal treatment strain-induced melting activation(CRITSIMA)method.The effects of pre-annealing temperature on the microstructure evolution and mechanical properties of semi-solid copper alloy billets were studied by OM,SEM,EDS,XRD,electron probe and Brinell hardness analyses.The results show that with increasing the pre-annealing temperature,the average grain size of the semi-solid copper alloy billet is increased,and the shape factor and liquid phase ratio are decreased.With increasing the pre-annealing temperature,Sn element content is increased in the solid solution ofα-Cu phase,segregation of Sn element is weakened,the content of intergranular brittle and hard phase δ is phase decreased,and the Brinell hardness is gradually decreased.The new phase Cu13.7Sn is detected in the semi-solid copper alloy billet,which is related to the high segregation of the intergranular Sn element.The semi-solid copper alloy billet prepared by pre-annealing at 600 ℃ for 2 h has fine and uniform microstructure and good mechanical properties.The average grain size is 68.34 μm,the shape factor is 0.78,and the Brinell hardness is 1254.4 MPa.
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