Acta Metall Sin  1997, Vol. 33 Issue (4): 398-405    DOI:

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MICROSTRUCTURE OF OXIDE SCALE AND OXIDATION MECHANISM OF Y~+ IMPLANTED ALLOY Ni20Cr

PENG Xiao; PING Dehai; LI Tiefan; WU Weitao(State Key Laboratory for Corrosion and Protection; Insititute of Corrosion and Protection of Metals; Chinese Academ of Sciences; Shenyang 110015)(Laboratory of Atomic Imaging of Solids;Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1996-03-15)

PENG Xiao; PING Dehai; LI Tiefan; WU Weitao(State Key Laboratory for Corrosion and Protection; Insititute of Corrosion and Protection of Metals; Chinese Academ of Sciences; Shenyang 110015)(Laboratory of Atomic Imaging of Solids;Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1996-03-15). MICROSTRUCTURE OF OXIDE SCALE AND OXIDATION MECHANISM OF Y~+ IMPLANTED ALLOY Ni20Cr. Acta Metall Sin, 1997, 33(4): 398-405.

Abstract References Related Articles Recommended Metrics Download:  PDF(3430KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The surface morphologies and microstructures as well as phase compositions of scale on the alloy Ni20Cr and the alloy implanted by Y+ (with the dose of 1×1O15,2×1016 and 1×1017 Y/ cm2 respectively) oxidized in air at 1000℃ have been investigated by means of SEM / EDS, XRD and TEM / EDS. It was found that all the scale of alloy Ni20Cr with and without yttrium implantation were composed of larger grained NiO, NiCr2O4 and finer grained Cr2O3, and among of which small pores were created at the triangular junctions of grain boundaries of NiO. The implanted yttrium ions over 2×1016/cm2 increased the volume fraction of Cr-containing oxide, in which yttrium, most of which formed small Y-containing oxide particles, was detected. According to the experimental results, it was believed that in the initial oxidation stage yttrium oxidized in preference to alloy elements and formed fine oxide particles (10-20nm), and sequentially the particles may not only promote the nucleation and growth for Cr2O3 also produce Y ions segregated to its grain boundaries due to the partial dissolution of the particles itselves, the latter was beneficial to decrease the scale growth rate as well as improve its mechanical properties for the reason that segragated Y ions may inhibit the Cr3+ out-diffusion along "short-circuit' and enhance the cohesion between oxide grains. Key words:  alloy Ni20Cr      yttrium ion implantation      oxide scale      microstructure      Received:  18 April 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I4/398 1Wood G C,Hodgkiess T.J Electrochem Soc,1966;113:319 2Douglass D L.Corros Sci,1968;8:665 3Stott F H.In:Lang E ed.,The Role of Active Elements in the Oxidation Behaviour of High Temperature Metals and Alloys,London:Elsevier,1989:3 4Stott F H,Wood G C,Stringer J.Oxid Met,1989;44:113 5彭晓。中国科学院金属腐蚀与防护研究所博士学位论文,1995 6Bennett M J,Moon D P.In:Lang E ed., The Role of Active Elements in the Oxidation Behaviour ofHigh Temperature Metals and Alloys,London:Elsevier,1989:111 7靳惠明.中国科学院金属腐蚀与防护研究所博士学位论文,1996 8Pint B A,Hobbs L W. 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