Effects of Deformation and Heat Treatment on Microstructure and Properties of Cu-0.26Cr-0.24Sn Alloy
Cu-0.26Cr-0.24Sn alloy was smelted using the gas protection furnace,and then the cast ingots were carried to rotary swaging,solid solution and aging treatment.The effects of deformation and heat treatment on the microstructure and properties of the alloy were characterized by optical microscope(OM),scanning electron microscope(SEM),X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results show that the microstructure alloy grains can be refined with increase of the swaging deformation strain,which improve the strength of the alloy,while the conductivity decreases slightly.After solid-solution treatment at 960 ℃ for 1 h,the micron-sized Cr-rich precipitates are fully dissolved.During solid-solution and aging process,the alloy recrystallizes and forms recrystallization texture,makes the<111>orientations parallel to the axis increases.The intensity of the recrystallized texture increases with increasing swage deformation strain,which improves the yield strength but decreases the elongation.After aging,the nano-sized Cr-rich particles are precipitated from the Cu-matrix,and the microhardness and conductivity increase significantly.The tensile strength and conductivity of the alloy by 75％rotary swaging and aging at 450 ℃ for 2.5 h can reach 476.5 MPa,68.7％IACS,respectively,and a superior combination of strength and electrical conductivity is obtained.
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