形变热处理对Cu-0.65Cr-0.15Mg-0.02Si合金组织与性能的影响  

Effect of thermo-mechanical treatment on the properties and microstructure of Cu-0.65Cr-0.15Mg-0.02Si alloy

作　　者：安峻宏 肖柱[1] 邱文婷[1] AN Junhong;XIAO Zhu;QIU Wenting(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学材料科学与工程,湖南长沙410083

出　　处：《金属功能材料》2023年第6期39-45,共7页Metallic Functional Materials

基　　金：国家自然科学基金(51974375)。

摘　　要：设计并制备了Cu-0.65Cr-0.15Mg-0.02Si合金,研究了形变热处理过程中合金的性能变化规律。同时,采用光学显微镜(OM)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对Cu-Cr-Mg-Si合金的成分和微观结构进行了表征。结果表明,铸态合金存在明显的非平衡析出相结构,固溶处理可以显著消除此情况;冷轧时效可以显著提高合金的性能;时效温度的提高可以提高合金的导电率,但也降低了合金的最大硬度;合金在450℃时效120 min达到最佳性能,硬度为159.8 HV,导电率为76%IACS。在时效过程中,基体首先析出fcc-Cr相,而后转变为bcc-Cr相。Cu-0.65Cr-0.15Mg-0.02Si alloys were designed and prepared,and the property variation law of alloy during thermo-mechanical treatment was studied.At the same time,the composition and microstructure of Cu-Cr-Mg-Si alloy were characterized by optical microscopy(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results show that the cast alloy has obvious dendrite structure,and solution treatment can significantly eliminate this situation.Cold rolling aging can significantly improve the performance of alloys.The increase of aging temperature can improve the conductivity of the alloy,but also reduce the maximum hardness of the alloy.The alloy achieves the best performance at 450℃ for 120 min,with a hardness of 159.8 HV and a conductivity of 76% IACS.In the aging process,the matrix first precipitates the fcc-Cr phase,and then transforms into the bcc-Cr phase.

关 键 词：Cu-Cr-Mg-Si合金 Cr析出相 形变热处理 取向关系 硬度 

分 类 号：TG156.93[金属学及工艺—热处理] TG146.11[金属学及工艺—金属学]