冷轧变形量对Al_(2)O_(3)/Cu复合材料组织和性能的影响  

Effect of cold rolling deformation on microstructure and properties of Al_(2)O_(3)/Cu composites

作　　者：宋昊 国秀花[1,2] 李韶林[1,2] 宋克兴 徐国杨 齐柯柯 刘嵩 SONG Hao;GUO Xiuhua;LI Shaolin;SONG Kexing;XU Guoyang;QI Keke;LIU Song(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Key Laboratory of Nonferrous Metal Materials Science and Processing Technology,Luoyang 471023,China;Henan Academy of Sciences Material Research Institute,Zhengzhou 450046,China;Henan Provincial Key Laboratory of Advanced Conductor Materials,Zhengzhou 450046,China)

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]河南省有色金属材料科学与加工技术重点实验室,洛阳471023 [3]河南省科学院材料研究所,郑州450046 [4]河南省先进导体材料重点实验室,郑州450046

出　　处：《复合材料学报》2024年第12期6782-6792,共11页Acta Materiae Compositae Sinica

基　　金：中国博士后科学基金(2020 T130172);河南省科技攻关项目(222102230064);十四五预研项目。

摘　　要：为进一步提升Al_(2)O_(3)/Cu复合材料的力学性能,本文采用内氧化法制备了Cu-0.57wt%Al_(2)O_(3)复合材料,研究了不同冷轧变形量对Al_(2)O_(3)/Cu复合材料的显微组织、导电率、力学性能的影响,重点探讨了不同变形量下复合材料强化机制的贡献。结果表明:随着冷轧变形量的增加,Al_(2)O_(3)/Cu复合材料的晶粒逐渐变为细长纤维状结构,平均晶粒尺寸由2.82μm(原始态)减小到0.56μm (90%变形量)。随着冷轧变形量的增加,Al_(2)O_(3)/Cu复合材料力学性能逐渐提升,60%变形量时达到峰值,强度和硬度分别为544 MPa和HV156,分别提升了35%和14%,而导电率仅从85%IACS减小到83%IACS。这是由于冷变形过程中,纳米级Al_(2)O_(3)颗粒与位错交互作用逐渐增强,晶界强化和位错强化对强度的贡献逐渐增大,分别由160MPa增加到264MPa和47 MPa增加到141 MPa。当变形量超过60%时,晶粒尺寸(0.56μm)与位错密度(3.5×10^(14)m^(-2))趋于稳定,位错强化与晶界强化对强度的贡献达到顶峰,力学性能最佳。In order to further enhance the room temperature mechanical properties of Al_(2)O_(3) composites,0.57wt%Al_(2)O_(3)/Cu composites were prepared by internal oxidation method.The effects of different cold-rolling deformation on the microstructure,electrical conductivity,and mechanical properties of Al_(2)O_(3)/Cu composites were studied,focusing on the contribution of various strengthening mechanisms to the strength of composite under different amounts of deformation.The results show that the grains of Al_(2)O_(3)/Cu composites gradually change to elongated fiber-like structure with increasing cold rolling deformation,and the average grain size decreases from^(2).82 μm(initial state) to 0.56 μm(90% deformation).The mechanical properties of the composites gradually improve with increasing cold rolling deformation,peaking at 60% deformation,with a strength of 544 MPa and a hardness of HV 156,which are increased by 35% and 14%,respectively,while the electrical conductivity only decreases from 85%IACS to 83%IACS.This is due to the interaction between nanoscale Al_(2)O_(3) particles and dislocations during cold deformation,grain boundary strengthening and dislocation strengthening gradually increase,and the calculated contributions values of grain boundary strengthening and dislocation strengthening increase from160 MPa and 47 MPa to 264 MPa and 141 MPa,respectively.When the deformation exceeds 60%,the grain size(0.56 μm) and dislocation density(3.5×10^(14) m^(-2)) tend to stabilize,the contribution of dislocation strengthening and grain boundary strengthening reaches its peak,and the mechanical properties are optimal.

关 键 词：Al_(2)O_(3)/Cu复合材料 冷轧变形 力学性能 晶界强化 位错强化 

分 类 号：TB331[一般工业技术—材料科学与工程]