Microstructure and properties of aged Cu-0.6Zr-0.3Fe alloy
Cu-0.6Zr-0.3Fe alloy was prepared by vacuum melting method.Microstructure,element distribution,phase and mechanical properties of the alloy were analyzed and tested by means of optical microscope(OM),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)analysis,X-ray diffraction and electronic universal testing machine.The results show that the grains of the as cast Cu-0.6Zr-0.3Fe alloy are relatively coarse,and there are black spherical and long strip shape eutectic structures between the grains.After solution treatment at 930 ℃ for 60 min,the grains become fine,and the eutectic structure changes from long strip shape to spherical.After 30％cold deformation and aging,the grains basically maintain the cold-rolled morphology.At the initial stage of aging,the hardness of the alloy rapidly increases to peak value,then decreases with the increase of aging time,and finally tends to stable or decrease,with the same trend in tensile strength change.The optimal aging process for the alloy under the experimental conditions is aging at 450 ℃ for 120 min,and its microhardness,tensile strength and conductivity are 152.6 HV0.3,495.4 MPa and 55.5％IACS,respectively.
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