内氧化法制备Al_2O_3颗粒弥散强化Cu合金的组织性能分析与理论校核
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摘要
以Cu-Al合金粉末为原料,采用内氧化方法制备出综合性能优异的Al_2O_3增强铜基复合材料。通过观察试样的显微组织,并测试其拉伸性能,分析存在的各种强化机制并定量计算综合强化效果。结果表明:Cu基体上均匀分布着Al_2O_3弥散相颗粒,颗粒尺寸约6 nm,颗粒间距为30～50 nm,冷拉拔后Cu丝屈服强度高达680 MPa;主要强化机制是弥散强化和热错配位错强化,均匀分布的细小Al_2O_3颗粒阻碍位错运动,强化效果显著;屈服强度实验值略低于理论值692 MPa,原因为Al_2O_3颗粒的团聚和存在多种变体造成的。
Al_2O_3 reinforced copper matrix composites with excellent comprehensive properties were prepared by internal oxidation method using Cu-Al alloy powder as raw material. By observing the microstructure of the sample and testing its tensile properties,the various strengthening mechanisms and quantitative calculation of the comprehensive strengthening effect were analyzed. The results show that Al_2O_3 dispersed phase particles are uniformly distributed on the Cu matrix,with particle size of about 6 nm and particle spacing of 30-50 nm,and the yield strength of Cu wire after cold drawing reaches 680 MPa. The main strengthening mechanisms are dispersion strengthening and thermal mismatch dislocation strengthening. The uniform distribution of fine Al_2O_3 particles hinders dislocation movement,and the strengthening effect is remarkable. The experimental value of yield strength is slightly lower than the theoretical value of 692 MPa due to the agglomeration of Al_2O_3 particles and the existence of various Al_2O_3 variants.
Al_2O_3 reinforced copper matrix composites with excellent comprehensive properties were prepared by internal oxidation method using Cu-Al alloy powder as raw material. By observing the microstructure of the sample and testing its tensile properties,the various strengthening mechanisms and quantitative calculation of the comprehensive strengthening effect were analyzed. The results show that Al_2O_3 dispersed phase particles are uniformly distributed on the Cu matrix,with particle size of about 6 nm and particle spacing of 30-50 nm,and the yield strength of Cu wire after cold drawing reaches 680 MPa. The main strengthening mechanisms are dispersion strengthening and thermal mismatch dislocation strengthening. The uniform distribution of fine Al_2O_3 particles hinders dislocation movement,and the strengthening effect is remarkable. The experimental value of yield strength is slightly lower than the theoretical value of 692 MPa due to the agglomeration of Al_2O_3 particles and the existence of various Al_2O_3 variants.
引文
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[3]吴语,柳羏.铜基高弹性导电合金的研究现状与发展趋势[J].金属功能材料,2011,18(5):74.
[4]方军,张涵,夏天东,等.电解铜箔与压延铜箔微观组织和性能差异性的研究[J].金属功能材料,2018,25(3):6.
[5]石永亮,林涛,杨晓彩,等.以含铜废液为原料制备Al2O3弥散强化Cu粉的工艺研究[J].粉末冶金工业,2017,27(2):6.
[6]李美霞,郭志猛,赵奇特.氧化铝弥散强化铜的研究进展及其应用[J].粉末冶金工业,2008,18(1):36.
[7]郭丽娜,胡本芙,刘安强,等.氧化物弥散强化钢的强化机理[J].工程科学学报,2013,35(5):586.
[8]曾鑫,李峰.制动压力对Cu基粉末冶金闸瓦片材料摩擦特性的影响[J].粉末冶金工业,2016,26(5):5.
[9]杨开怀,曾建民,邹泽昌,等.模压变形5052铝合金的显微组织与室温拉伸性能[J].机械工程材料,2016,40(4):1.
[10] Avettand-F M N,Simar A,Shabadi R,et al. Characterizationof oxide dispersion strengthened copper based materials developed by friction stir processing[J].Materials and Design,2014,60(8):354.
[11]田保红,周洪雷,张毅,等. Al2O3弥散强化铜/铬复合材料的强化机理[J].材料热处理学报,2011,32(S1):13.
[12]张毅,刘平,田保红,等. Cu-2.0Ni-0.5Si合金时效析出动力学研究[J].功能材料,2010,41(10):1827.
[13] Viseslava Rajkovic,Dusan Bozic,Jelena Stasic,et al. Processing,characterization and properties of copper-based composites strengthened by low amount of alumina particles[J].Powder Technology,2014(268):397.