纯钛表面FeCoNiCr0.5Al0.8高熵合金脉冲激光熔覆层的显微组织和性能
Microstructure and Properties of FeCoNiCr0.5Al0.8 High Entropy Alloy Pulsed Laser Cladding Layer on Pure Titanium Surface
摘 要
采用脉冲激光熔覆技术在TA2工业纯钛表面制备了FeCoNiCr0.5Al0.8高熵合金熔覆层，研究了熔覆层的显微组织、物相组成、硬度和高温抗氧化性能。结果表明：熔覆层和基体间形成良好的冶金结合，熔覆层中不存在裂纹、气孔等缺陷，熔合界面较平直；熔覆层表面熔池边界线处为细小等轴晶，中部为树枝晶，熔覆层截面组织为层状分布的细晶；熔覆层由简单面心立方结构Ti2Ni和AlCTi2组成；熔覆层的平均硬度为761.23 HV，是基体硬度的4倍以上；熔覆层具备良好的高温抗氧化性能，在800℃氧化120 h后的单位面积质量增加量为17 mg·cm-2，仅约为基体的1/3。
TA2工业纯钛
高熵合金
显微组织
高温抗氧化性能
pulsed laser cladding
TA2 industrial pure titanium
high entropy alloy
microstructure
high temperature oxidation resistance
Abstract
The FeCoNiCr0.5Al0.8 high entropy alloy cladding layer was prepared on the surface of TA2 industrial pure titanium by pulsed laser cladding technique, and the microstructure, phase composition, hardness and high temperature oxidation resistance of the cladding layer were studied. The results show that a good metallurgical bonding was formed between the cladding layer and the substrate, there were no defects such as cracks and pores in the cladding layer, and the fusion interface was relatively straight. There were fine equiaxed crystals at the molten pool boundary of the cladding layer and dendrites in the middle of the molten pool. The section structure of the cladding layer was layered distributed fine crystals. The cladding layere was mainly composed of simple face-centered cubic structure Ti2Ni and AlCTi2. The average hardness of the cladding layer was 761.23 HV, which was more than 4 times the hardness of the substrate. The cladding layer had excellent high temperature oxidation resistance, and the mass grain per unit area of the cladding layer oxidized at 800℃ for 120 h was about 17 mg·cm-2, which was about only one third of the substrate.
中图分类号 TG174.44 DOI 10.11973/jxgccl202204003
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51879089）
收稿日期 2021/3/15
修改稿日期 2022/1/23
网络出版日期
作者单位点击查看
备注尹正生(1996-),男,江苏常州人,硕士研究生导师:蒋永锋教授
引用该论文: YIN Zhengsheng,XUE Xinyu,JIANG Yongfeng,LU Tao,ZHAO Lijuan,JI Xiulin. Microstructure and Properties of FeCoNiCr0.5Al0.8 High Entropy Alloy Pulsed Laser Cladding Layer on Pure Titanium Surface[J]. Materials for mechancial engineering, 2022, 46(4): 21～25
尹正生,薛鑫宇,蒋永锋,陆韬,赵丽娟,纪秀林. 纯钛表面FeCoNiCr0.5Al0.8高熵合金脉冲激光熔覆层的显微组织和性能[J]. 机械工程材料, 2022, 46(4): 21～25
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【4】GHOSH R, THOTA H K, RANI R U.Silicate spray-coated nickel-plated titanium alloy for space applications:Corrosion resistance and thermo-optical properties[J].Journal of Materials Engineering and Performance, 2021, 30(2):1378-1386.
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【6】GONG Y, MA F Q, XUE Y, et al.Failure analysis on leaked titanium tubes of seawater heat exchangers in recirculating cooling water system of coastal nuclear power plant[J].Engineering Failure Analysis, 2019, 101:172-179.
【7】LIU Z, LIU H, HASHIMOTO T, et al.Anodic oxide film growth on thin magnetron sputter-deposited titanium layer[J].Materials Characterization, 2014, 98:102-106.
【8】MOROŃCZYK B, URA-BIŃCZYK E, KURODA S, et al.Microstructure and corrosion resistance of warm sprayed titanium coatings with polymer sealing for corrosion protection of AZ91E magnesium alloy[J].Surface and Coatings Technology, 2019, 363:142-151.
【9】SAMAVATIAN M, HALVAEE A, AMADEH A A, et al.An investigation on microstructure evolution and mechanical properties during liquid state diffusion bonding of Al2024 to Ti-6Al-4V[J].Materials Characterization, 2014, 98:113-118.
【10】张蕾涛, 刘德鑫, 张伟樯, 等.钛合金表面激光熔覆涂层的研究进展[J].表面技术, 2020, 49(8):97-104. ZHANG L T, LIU D X, ZHANG W Q, et al.Research progress of laser cladding coating on titanium alloy surface[J].Surface Technology, 2020, 49(8):97-104.
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