冷轧变形量对Al<sub>2</sub>O<sub>3</sub>/Cu复合材料组织性能的影响

宋昊; 国秀花; 李韶林; 宋克兴; 徐国杨; 齐柯柯; 刘嵩

冷轧变形量对Al₂O₃/Cu复合材料组织性能的影响

宋昊²,
国秀花^{1, 2, ,},
李韶林^{1, 2},
宋克兴^{3, 4},
徐国杨^{1, 2},
齐柯柯^{1, 2},
刘嵩^{1, 2}

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

基金项目: 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

详细信息

通讯作者:
国秀花, 硕士生导师, 博士, 主要从事新型铜基材料开发及其载流摩擦学应用　E-mail: guoxiuhua@haust.edu.cn

中图分类号: TB331
计量
- 文章访问数: 70
- HTML全文浏览量: 41
- 被引次数: 0
出版历程
- 收稿日期: 2024-01-11
- 修回日期: 2024-04-08
- 录用日期: 2024-04-25
- 网络出版日期: 2024-05-27

Effect of cold rolling deformation on microstructure and properties of Al₂O₃/Cu composites

SONG Hao²,
GUO Xiuhua^{1, 2
, ,},
LI Shaolin^{1, 2},
SONG Kexing^{3, 4},
XU Guoyang^{1, 2},
QI Keke^{1, 2},
LIU Song^{1, 2}

1.
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023; China
2.
Henan Key Laboratory of Nonferrous Metal Materials Science and Processing Technology, Luoyang 471023; China
3.
Henan Academy of Sciences, Zhengzhou 450046; China
4.
Henan Provincial Key Laboratory of Advanced Conductor Materials, Zhengzhou 450046; China

Funds: China Postdoctoral Science Foundation(No.2020 T130172)； Key R & D and promotion projects of Henan Province(No.222102230064)；14 th Five-Year Pre-research Project

摘要

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。
- 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.
- Cu-Al₂O₃ composite /
- cold rolling deformation /
- mechanical property /
- boundary strengthening /
- dislocation strengthening

HTML全文

图 1 Cu-0.57 wt% Al₂O₃复合材料制备示意图

Figure 1. Schematic diagram of Cu-0.57 wt% Al₂O₃ composites preparation

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图 2 不同冷轧变形量的Al₂O₃/Cu复合材料微观组织 (a) 0%；(b) 30%；(c) 60%；(d) 90%

Figure 2. Microstructure of Al₂O₃/Cu composites with different cold rolling deformations (a) 0%；(b) 30%；(c) 60%；(d) 90%

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图 3 不同冷轧变形量的Al₂O₃/Cu复合材料SEM图 (a)0%；(b)30%；(c)60%；(d)90%

Figure 3. SEM images of Al₂O₃ composites under different cold rolling deformations (a)0%；(b)30%；(c)60%；(d)90%

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图 4 不同冷轧变形量下Al₂O₃/Cu复合材料的XRD图谱

Figure 4. XRD pattern of Al₂O₃/Cu composites under different cold rolling deformations

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图 5 不同冷轧变形量下 Al₂O₃/Cu复合材料硬度与导电率变化曲线

Figure 5. Variation curves of hardness and electrical conductivity of Al₂O₃/Cu composites under different cold rolling deformations

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图 6 不同冷轧变形量下Al₂O₃/Cu复合材料的拉伸应力-应变曲线

Figure 6. Tensile stress-strain curves of Al₂O₃/Cu composites under different cold rolling deformation

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图 7 不同冷轧变形量下Al₂O₃/Cu复合材料的拉伸性能变化

Figure 7. Variation of tensile properties of Al₂O₃/Cu composites under different cold rolling deformations

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图 8 Al₂O₃/Cu复合材料的拉伸断口形貌(a) 0%；(b) 30%；(c) 60%；(d) 90%

Figure 8. Tensile fracture morphology of Al₂O₃/Cu composites (a) 0%；(b) 30%；(c) 60%；(d) 90%

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图 9 Cu-Al₂O₃复合材料TEM图像 (a)、(b)Cu/Al₂O₃复合材料微观组织形貌；(c)图(b)黄色区域FFT图像；(d)图(b)黄色区域IFFT

Figure 9. TEM images of Cu-Al₂O₃ composites (a) 、(b) Microstructure morphology of Cu/Al₂O₃ composites; (c) FFT image of the yellow area in Fig.(b); (d) IFFT image of the red area in Fig.(b);

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图 10 不同变形量下Al₂O₃/Cu复合材料中各强化机制贡献计算结果

Figure 10. Contribution percentage of each strengthening mechanism to the tensile strength of the Al₂O₃/Cu composites

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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	σ_gb/MPa	σ_or/MPa	σ_dis/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, σ_gb is the grain boundary strengthening, σ_or is the orowan strengthening, σ_dis is the dislocation strengthening.

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