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| Effect of cold deformation on microstructures and properties of Al2O3-dispersion strengthened copper for power cable |
| ZHANG Jing-jie |
| School of Mechanical and Electrical Engineering，He’nan Radio and Television University，Zhengzhou 450000，China |
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Abstract The hardness, electrical conductivity, tensile properties and microstructures of Al2O3-dispersion strengthened copper alloy (Cu-5% Al2O3) for power cables with different deformation were tested. The results show that with the increase of deformation, the hardness of the alloy increases and the electrical conductivity does not change significantly. After cold rolling treatment, a remarkable work hardening phenomenon occurs. With the increase of deformation, the work hardening rate accelerates obviously. The growth rate of tensile strength and yield strength of the alloy is relatively stable, but the elongation decreases. After cold rolling, compact structure was formed in the alloy matrix, and no obvious holes or cracks were formed. Many fine grains with uniform size of about 300 nm with flat grain boundaries were formed in the alloy, resulting in high dislocation density in some regions.
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Received: 17 May 2018
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2019, Vol. 29 
