Effects of cold deformation and aging on microstructure and properties of Cu-0.3Zr-0.2Cr alloy
The Cu-0.3Zr-0.2Cr alloy was prepared by vacuum melting method.After hot forging,the Cu-0.3Zr-0.2Cr alloy was solution treated at 900℃,followed by 30%and 60%cold rolling,respectively.Then the alloy was aged at 400-550℃for 0-360 min.After aging treatment,the properties and microstructures of the alloy were tested and observed.The results show that after 60%cold rolling and 450℃ageing for 120 min,the alloy has better performances,the hardness is up to 179HV,the tensile strength is 467 MPa,the electrical conductivity is 88.5%IACS,and the elongation is 12.1%.Meanwhile,the alloy mainly has copper texture.After aging for 360 min,the main texture of the alloy changes to a brass texture.The transformation of texture has a certain effect on the ductility of the alloy.After aging,the matrix precipitates a large number of nano-sized Cr phases,which leads to a significant increase in the strength and electrical conductivity of the alloy.
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