Anodic characteristics and electrochemical machining of two typical γ-TiAl alloys and its quantitative dissolution model in NaNO3 solution

被引:43
作者
Wang, Yudi [1 ]
Xu, Zhengyang [1 ]
Zhang, An [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Natl Key Lab Sci & Technol Helicopter Transmiss, Nanjing 210016, Peoples R China
基金
中国国家自然科学基金;
关键词
Electrochemical machining; gamma-TiAl; Lamellar microstructure; Passive film; Polarisation; TITANIUM ALUMINIDE ALLOY; CORROSION BEHAVIOR; OXIDATION; FILM; TRANSDUCER; ECM;
D O I
10.1016/j.electacta.2019.135429
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrochemical machining (ECM) is a promising machining method for lightweight gamma-TiAl alloys, owing to several advantages over traditional methods. In this work, the electrochemical and ECM experiments of two typical gamma-TiAl alloys (Ti-48Al-2Cr-2Nb and Ti-45Al-2Mn-2Nb+0.8 vol% TiB2 XD) in NaNO3 solution are carried out to obtain their anodic dissolution characteristics, and some special phenomena are analyzed in detail. The polarisation behaviour of anode is measured by polarisation curve and cyclic voltammetry. The composition and structure of the passive film on the surface of anode are determined by X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy. The results show that the passive film is mainly composed of TiO2 and Al2O3, and its structure consists of a loose outer film and a dense inner film. ECM flat experiments at different feed rates are also carried out, where it is found that the lamellar microstructure of the two alloys is fully exposed. For TiAl 4822, there are lamellar and non-lamellar regions on the surface of the workpieces, and the direction of the lamella in the different lamellar colonies is also different. For TiAl 45XD, however, some protruding needle-like and globular TiB2 exist on the processed surface, which is the main factor influencing the surface quality. Finally, a quantitative dissolution model is also proposed to characterise the dissolution behaviour of TiAl 4822 and TiAl 45XD in 20%NaNO3 solution. (C) 2019 Elsevier Ltd. All rights reserved.
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页数:13
相关论文
共 57 条
  • [1] Corrosion mechanisms in titanium oxide-based films produced by anodic treatment
    Alves, A. C.
    Wenger, F.
    Ponthiaux, P.
    Celis, J. -P.
    Pinto, A. M.
    Rocha, L. A.
    Fernandes, J. C. S.
    [J]. ELECTROCHIMICA ACTA, 2017, 234 : 16 - 27
  • [2] Electrochemical Dissolution Behavior of Titanium and Titanium-based Alloys in Different Electrolytes
    Baehre, D.
    Ernst, A.
    Weisshaar, K.
    Natter, H.
    Stolpe, M.
    Busch, R.
    [J]. 18TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM XVIII), 2016, 42 : 137 - 142
  • [3] ELECTROCHEMICAL MACHINING OF SOME TITANIUM-ALLOYS IN BROMIDE ELECTROLYTES
    BANNARD, J
    [J]. JOURNAL OF APPLIED ELECTROCHEMISTRY, 1976, 6 (06) : 477 - 483
  • [4] Bewlay B., 2013, MRS Online Proceedings Library Archive, V1516, P49, DOI [DOI 10.1557/OPL.2013.44, 10.1557/opl.2013.44]
  • [5] Multi-objective optimization of hole characteristics during pulsed Nd:YAG laser microdrilling of gamma-titanium aluminide alloy sheet
    Biswas, R.
    Kuar, A. S.
    Mitra, S.
    [J]. OPTICS AND LASERS IN ENGINEERING, 2014, 60 : 1 - 11
  • [6] Electron beam welding of a Ti-45Al-2Nb-2Mn+0.8 vol% TiB2 XD alloy
    Chaturvedi, MC
    Richards, NL
    Xu, Q
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 240 : 605 - 612
  • [7] Electrochemical machining of gamma titanium aluminide intermetallics
    Clifton, D
    Mount, AR
    Jardine, DJ
    Roth, R
    [J]. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2001, 108 (03) : 338 - 348
  • [8] Electrochemical superabrasive machining of a nickel-based aeroengine alloy using mounted grinding points
    Curtis, D. T.
    Soo, S. L.
    Aspinwall, D. K.
    Sage, C.
    [J]. CIRP ANNALS-MANUFACTURING TECHNOLOGY, 2009, 58 (01) : 173 - 176
  • [9] Corrosion evaluation of Ti-48Al-2Cr-2Nb (at.%) in Ringer's solution
    Delgado-Alvarado, C.
    Sundaram, P. A.
    [J]. ACTA BIOMATERIALIA, 2006, 2 (06) : 701 - 708
  • [10] Characterisation of titanium oxide films by potentiodynamic polarisation and electrochemical impedance spectroscopy
    Diamanti, M. V.
    Bolzoni, F.
    Ormellese, M.
    Perez-Rosales, E. A.
    Pedeferri, M. P.
    [J]. CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, 2010, 45 (06) : 428 - 434