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铝含量对AlxCrFeCoCuNi高熵合金涂层抗氧化性能的影响

Effect of Aluminum Content on Oxidation Resistance of AlxCrFeCoCuNi High Entropy Alloy Coating

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摘要

采用激光熔覆技术在45#钢基底上制备了AlxCrFeCoCuNi(x=0.5、2.0、4.0)高熵合金涂层, 研究了Al含量x对涂层的抗氧化性能的影响规律。利用扫描电镜、能谱仪和X射线衍射仪对涂层结构进了测定, 进而揭示铝含量的影响。结果表明, 高熵合金涂层主要由简单面心和体心立方结构的固溶体组成, 并且随着铝含量增加到x=4时完全转变为单一的体心立方结构。在900 ℃大气气氛中氧化动力学曲线表明AlxCrFeCoCuNi高熵合金涂层具有较好的抗氧化性能, 并且随着Al含量的增加而提高。这是因为高温氧化后其表面主要生成了Al2O3和Cr2O3保护膜, 从而提高了AlxCrFeCoCuNi高熵合金涂层的抗氧化性能。

Abstract

AlxCrFeCoCuNi (x=0.5、2.0、4.0) high entropy alloy coatings were prepared on 45 steel surface by laser cladding technology, and the effect of the aluminum content x on the oxidation resistance of the coating were studied. The cross-sectional microstructure of the coating were analyzed by SEM, XRD and EDS. The results show that, the as-clad coating is composed of FCC and body center cubic BCC solid solution. The oxidation tests show that the addition of Al effectively improves the oxidation resistance of AlxCrFeCoCuNi at 900 ℃ in air. The formation of a dense and adherent scale consisting of Cr2O3 and Al2O3 is supposed to be responsible for the observed improvement of the oxidation resistance.

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中图分类号:TG156.99

基金项目:云南省教育厅资助项目(项目编号: 2013Y305); 昆明理工大学分析测试基金资助项目(项目编号: 20130197)

收稿日期:2015-12-11

修改稿日期:2016-01-28

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作者单位    点击查看

郑必举:昆明理工大学材料科学与工程学院, 云南 昆明 650093
蒋业华:昆明理工大学材料科学与工程学院, 云南 昆明 650093
胡文:昆明理工大学材料科学与工程学院, 云南 昆明 650093

联系人作者:郑必举(zhengbiju@gmail.com)

备注:郑必举(1982-), 男, 博士, 副教授, 主要从事激光表面改性研究。

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引用该论文

Zheng Biju,Jiang Yehua,Hu Wen. Effect of Aluminum Content on Oxidation Resistance of AlxCrFeCoCuNi High Entropy Alloy Coating[J]. APPLIED LASER, 2016, 36(1): 18-22

郑必举,蒋业华,胡文. 铝含量对AlxCrFeCoCuNi高熵合金涂层抗氧化性能的影响[J]. 应用激光, 2016, 36(1): 18-22

被引情况

【1】隽永飞,李军,蒋云强,贾万莉,鲁忠杰. 激光熔覆制备高熵合金涂层的研究进展. 应用激光, 2018, 38(1): 130-135

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