Cu-Al2O3弥散强化铜合金接触线的组织和性能 |
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引用本文: | 袁远,汤文亮. Cu-Al2O3弥散强化铜合金接触线的组织和性能[J]. 材料热处理学报, 2020, 41(1): 33-38 |
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作者姓名: | 袁远 汤文亮 |
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作者单位: | 中国铁道科学研究院集团有限公司,北京,100081;华东交通大学信息工程学院,江西南昌,330013 |
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基金项目: | 江西省重点研发计划项目 |
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摘 要: | 采用内氧化法制备的Cu-Al2O3弥散强化铜合金接触线,并对其组织和性能进行了研究。结果表明:Cu-Al2O3合金接触线抗拉强度达到568 MPa,导电率达到84%IACS,载流量达到764 A,技术性能优于TB/T 2809-2017标准中Cu-Cr-Zr合金接触线的技术要求;其强化机制主要为细晶强化及Al2O3粒子引起的弥散强化和应变强化;由于合金基体内Al2O3粒子不均匀,导致合金内部组织的不均匀,从而引起显微组织的尺寸不均和拉伸断口混合断裂的断裂方式。
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关 键 词: | 接触线 Cu-Al2O3合金 铜基复合材料 |
Microstructure and properties of Cu-Al2O3 dispersion strengthened copper alloy contact wire |
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Affiliation: | (China Academy of Railway Sciences Group Co Ltd,Beijing 100081,China;School of Information Engineering,East China Jiaotong University,Nanchang 330013,China) |
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Abstract: | Cu-Al2O3 dispersion strengthened copper alloy contact wire was prepared by internal-oxidation method, and its microstructure, mechanical and electrical properties were studied. The results show that the tensile strength, the conductivity and the current carrying capacity of the Cu-Al2O3 alloy contact wire are 568 MPa, 84 %IACS and 764 A, respectively, and the technical properties of the Cu-Al2O3 alloy contact wire are better than those of the Cu-Cr-Zr alloy contact wire in TB/T 2809-2017 standard. The strengthening mechanisms of the alloy are mainly fine grain strengthening, the dispersion strengthening and strain strengthening caused by Al2O3 particles. Due to the non-uniformity of the Al2O3 particles in the alloy matrix, the internal microstructure of the alloy is non-uniform, which leads to the microstructure with non-uniform size, and the fracture mode of tensile fracture is the mixed fracture. |
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Keywords: | contact wire Cu-Al2O3 alloy copper-based composite |
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