Effect of cold rolling deformation on microstructure and properties of Al2O3/Cu composites
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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156 HV,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。
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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
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 156 HV, 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 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 from 160 MPa and 47 MPa to 264 MPa and 141 MPa, respectively. When the deformation exceeds 60%, the grain size (0.56μm) and dislocation density (3.5×1014m−2) tend to stabilize, the contribution of dislocation strengthening and grain boundary strengthening reaches its peak, and the mechanical properties are optimal. -
表 1 不同变形量下Al2O3/Cu复合材料的强化机制对抗拉强度的贡献
Table 1. Contribution of strengthening mechanism to tensile strength of Al2O3/Cu composites at different deformations
Rolling reduction/% ρ/1014m−2 σgb/MPa σor/MPa σdis/MPa Theoretical value /MPa Measured value/MPa Deviation/% 0 0.39 160 168 47 375 403 6.9 30 0.75 192 168 65 425 464 8.5 60 3.56 264 168 141 573 543 5.5 90 3.60 262 168 142 572 544 5.1 Notes: ρ is the dislocation density, σgb is the grain boundary strengthening, σor is the orowan strengthening, σdis is the dislocation strengthening. -
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