THE INFLUENCE OF Y~+-IMPLANTATION ON OXIDATION OF DIRECTIONALLY SOLIDIFIED ALLOY Ni30Cr

J Chin Soc Corr Pro

1997, Vol. 17

Issue (4): 269-275 DOI:

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THE INFLUENCE OF Y~+-IMPLANTATION ON OXIDATION OF DIRECTIONALLY SOLIDIFIED ALLOY Ni30Cr

XIN Li ZHOU Longjiang LI Meishuan LI Tiefan(Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences)

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Abstract The influence of implanted yttrium at dose of 1 × 1017Y+/cm2 on the isothermal oxidation behavior of directionally solidified alloy Ni30Cr in air at 1000℃ was studied using TGA, SEM/EDAX, SEM/EPMA and XRD. The oxidation behavior of both transversal and longitidinal samples was similar despite of their difference in microstructure. Y+-implantation reduced the weight gain by a factor of 2-3 after 20h oxidation. A finer grain size scale formed on the Y+-implanted alloy. Preferred oxidation and internal oxidation along grain boundaries were eliminated and the formation and growth of interfacial voids were inhibited. Y+-implantation improvement might be due to the change of the growth mechanism of scale from predominant outward diffusion of cations to prevailing inward diffusion of anions.

Key words: Oxidation Ion implantation Yttrium Ni-Cr alloy Directional solidification

Received: 25 August 1997

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XIN Li ZHOU Longjiang LI Meishuan LI Tiefan(Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences). THE INFLUENCE OF Y~+-IMPLANTATION ON OXIDATION OF DIRECTIONALLY SOLIDIFIED ALLOY Ni30Cr. J Chin Soc Corr Pro, 1997, 17(4): 269-275.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I4/269

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