C18150合金冷轧时效过程中微结构及性能演化机理

Microstructure and Properties Evolution Mechanism of C18150 Alloy during Cold Rolling and Aging

采用能谱仪、透射电子显微镜、电子背散射衍射等多尺度表征方法,研究了不同冷轧变形量及时效处理对C18150合金微结构的影响,并对过程中的力学和导电性能进行了系统分析。结果表明:经过不同冷轧变形和时效处理,C18150合金的硬度从141.0 HV增加到183.9 HV和186.5 HV,导电率从49.8%IACS提高到77.1%IACS和82.7%IACS。电子背散射衍射观察显示,侧面晶粒尺寸逐渐减小。处理后试样的变形织构强度提升,Brass织构占比增加,几何必须位错密度分布均匀化。析出相数量增多,呈椭球状和长条棒状,平均尺寸逐渐减小,析出相与基体逐渐从半共格转变为共格关系。

Utilizing multi-scale characterization methods,including Energy Dispersive Spectroscopy(EDS),Transmission Electron Microscopy(TEM),and Electron Backscatter Diffraction(EBSD),the effects of varying degrees of cold rolling deformation and aging treatments on the microstructure of the C18150 alloy were investigated.Throughout the process,the mechanical and electrical properties were systematically analyzed.The results indicate that increasing levels of cold rolling deformation and aging treatments elevated the alloy's hardness from 141.0 HV to 183.9 HV and 186.5 HV,respectively,and enhanced its electrical conductivity from 49.8%IACS to 77.1%IACS and 82.7%IACS.EBSD revealed a gradual reduction in grain size on the side.Post-treatment,the deformation texture strength of the samples increased,the proportion of the Brass texture rose,and the distribution of geometrically necessary dislocation density became more uniform.The number of precipitated phases increased,exhibiting ellipsoidal and elongated rod-like shapes,with the average size gradually decreasing.The precipitate phases transitioned from a semi-coherent relationship to a coherent relationship with the matrix.