时效对冷轧态Cu-Cr-(Sc)合金组织和性能的影响

Effect of aging on microstructure and properties of cold-rolled Cu-Cr-(Sc)alloys

对冷轧态Cu-Cr和Cu-Cr-Sc合金进行时效处理,使用透射电镜、扫描电镜、光学显微镜、显微硬度计和涡流金属导电仪等研究了不同时效温度和时间对合金显微硬度、抗拉强度和导电率的影响。结果表明:480℃时效1 h后,Cu-Cr-Sc合金的综合性能较佳,其显微硬度达到161 HV0.1,导电率达到81.9%IACS,抗拉强度达到491 MPa;相较于480℃时效1 h的Cu-Cr合金,显微硬度提升了24.8%,抗拉强度提升了35.3%,导电率下降了12.9%,表明添加Sc可以显著提升Cu-Cr合金的力学性能,但是会略微降低导电率。微观组织分析表明Cu-Cr-Sc合金峰值时效后析出了Cr相,主要形貌为咖啡豆状和球状,析出相均为面心立方结构,与基体保持良好的共格关系。

The cold-rolled Cu-Cr and Cu-Cr-Sc alloys were aged,and the effect of aging temperature and time on microhardness,tensile strength and electrical conductivity of the alloys was studied by using transmission electron microscopy,scanning electron microscopy,optical microscope,microhardness tester and eddy current metal conductivity tester.The results show that after aging at 480℃ for 1 h,the comprehensive properties of the Cu-Cr-Sc alloy are better,its microhardness reaches 161 HV0.1,electrical conductivity reaches 81.9%IACS,and tensile strength reaches 491 MPa.Compared with the Cu-Cr alloy aged at 480℃ for 1 h,the microhardness increases by 24.8%,the tensile strength increases by 35.3%,and the electrical conductivity decreases by 12.9%,indicating that the addition of Sc can significantly improve the mechanical properties of the Cu-Cr alloy,but will slightly reduce the electrical conductivity.The microstructure analysis shows that the Cr phase is precipitated from the Cu-Cr-Sc alloy after peak aging,the main morphology is coffeebean shape and spherical shape,and the precipitated phase is face-centered cubic structure,and maintains a good coherent relationship with the matrix.