冷轧变形量对Al2O3/Cu复合材料组织和性能的影响
Effect of cold rolling deformation on microstructure and properties of Al2O3/Cu composites
宋昊 1国秀花 2李韶林 2宋克兴 3徐国杨 2齐柯柯 2刘嵩2
作者信息
- 1. 河南省有色金属材料科学与加工技术重点实验室,洛阳 471023
- 2. 河南科技大学 材料科学与工程学院,洛阳 471023;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;河南省先进导体材料重点实验室,郑州 450046
- 折叠
摘要
为进一步提升Al2O3/Cu复合材料的力学性能,本文采用内氧化法制备了Cu-0.57wt％Al2O3 复合材料,研究了不同冷轧变形量对Al2O3/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,Al2O3/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 2.82 μm(原始态)减小到 0.56 μm(90％变形量).随着冷轧变形量的增加,Al2O3/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HV 156,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Al2O3 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 160 MPa增加到 264 MPa和 47 MPa增加到 141 MPa.当变形量超过 60％时,晶粒尺寸(0.56 μm)与位错密度(3.5×1014 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.
Abstract
In order to further enhance the room temperature mechanical properties of Al2O3 composites,0.57wt％Al2O3/Cu composites were prepared by internal oxidation method.The effects of different cold-rolling deformation on the microstructure,electrical conductivity,and mechanical properties of Al2O3/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 Al2O3/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 Al2O3 particles and disloca-tions during cold deformation,grain boundary strengthening and dislocation strengthening gradually increase,and the calculated contributions values of grain boundary strengthening and dislocation strengthening increase from 160 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(3.5×1014 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
Al2O3/Cu复合材料/冷轧变形/力学性能/晶界强化/位错强化Key words
Cu-Al2O3 composite/cold rolling deformation/mechanical property/boundary strengthening/dislo-cation strengthening引用本文复制引用
出版年
2024
NETL
NSTL
万方数据