深冷轧制及时效处理过程中Cu-Fe合金的组织性能演变  

Microstructure and properties evolution of Cu⁃Fe alloy after cryogenic rolling and aging treatment

作　　者：马启东 张宇博[1] 岳世鹏 陈佳乐 李廷举[1] Ma Qidong;Zhang Yubo;Yue Shipeng;Chen Jiale;Li Tingju(School of Materials Science and Engineering,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《金属热处理》2024年第4期48-54,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(52171135);国家重点研发计划(2018YFE0306103)。

摘　　要：利用SEM、XRD、TEM、力学性能及导电性能测试研究了Cu-5Fe合金在深冷轧制及时效过程中组织和性能的演变规律。结果表明,变形量为90%时,相比室温轧制,深冷轧制后合金的位错密度更高,Cu基体晶粒和Fe相的细化更显著。时效温度为500℃时,深冷轧制试样中析出的纳米Fe相更加细小,数量更多,这是因为深冷轧制试样中更高的形变储能和位错密度更有效地促进了Fe相析出。经过90%变形量深冷轧制和500℃时效1 h后,Cu-5Fe合金的抗拉强度为551.5 MPa,导电率为69%IACS,综合性能优于室温轧制结合时效处理后的合金,这归因于深冷轧制试样再结晶后的晶粒仍小于室温轧制试样的,同时深冷轧制试样中更多纳米Fe相带来的析出强化效果更强,对合金的导电性影响也更小。The evolution of microstructure and properties of the Cu⁃5Fe alloy after cryogenic rolling(CR)and aging was studied by means of SEM,XRD,TEM,mechanical properties and electrical conductivity tests.The results show that when the deformation is 90%,the dislocation density of the alloy after CR is higher than that of room temperature rolling(RTR),and the refinement of Cu matrix grains and Fe phases is more significant.When the aging temperature is 500℃,the nano⁃Fe phase precipitates in the CR specimen is finer and more.This is because the higher deformation energy storage and dislocation density in the CR specimen promote the precipitation of Fe phase more effectively.After 90%deformation CR and aging at 500℃for 1 h the tensile strength and electrical conductivity of the Cu⁃5Fe alloy are 551.5 MPa and 69%IACS,respectively.The comprehensive performance is better than that of the alloy after RTR process combined with aging treatment.This is due to the fact that the recrystallized grains of the CR specimen are still smaller than those of the RTR specimen,meanwhile,more nano⁃Fe phases in the CR specimen bring stronger precipitation strengthening effect and less influence on the conductivity of the alloy.

关 键 词：Cu-5Fe合金 深冷轧制 时效处理 析出相 

分 类 号：TG166.2[金属学及工艺—热处理]