Rare Earth Effects on Adhesion of Cr2O3 Oxide Scale Formed on Surface of Co-40Cr Alloy
来源期刊：JOURNAL OF RARE EARTHS2001年第1期
论文作者：李美栓 靳惠明 李铁藩 张林楠
Abstract: Isothermal and cyclic oxidation behaviors of Co-40Cr alloy at 1000 ℃ in air were studied. Scanning electron microscopy (SEM) was used to examine the oxide scale formed on the surface of the alloy. By comparing the oxidation behaviors of Co-40Cr alloy and its 3×1016 and 3×1017Y+/cm2 implanted specimens, it was found that the resistant to oxidation property of Co-40Cr was greatly improved due to the implantation of yttrium. Acoustic emission was used to study the distribution of defects at the interface between the scale and alloy. Raman spectrum was also used to study the stress status in chromic scale formed on the surface of Co-40Cr with and without yttrium. The main reason for the improvement of resistant to oxidation property of Y-doped Co-40Cr probably is that yttrium can segregate to Cr2O3 grain boundaries and change the scale′s growing mechanism and mechanical property. Most importantly, Y-implantation decreases the size and number of interfacial defects and the residual stress in the scale, and remarkably enhances the adhesion of chromia scale with Co-40Cr substrate.
李美栓1，靳惠明2，李铁藩1，张林楠2
(1.State Key Laboratory of Corrosion Science, Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences,;
2.Laboratory of Corrosion and Protection, Shenyang University of Technology,)
Abstract:Isothermal and cyclic oxidation behaviors of Co-40Cr alloy at 1000 ℃ in air were studied. Scanning electron microscopy (SEM) was used to examine the oxide scale formed on the surface of the alloy. By comparing the oxidation behaviors of Co-40Cr alloy and its 3×1016 and 3×1017Y+/cm2 implanted specimens, it was found that the resistant to oxidation property of Co-40Cr was greatly improved due to the implantation of yttrium. Acoustic emission was used to study the distribution of defects at the interface between the scale and alloy. Raman spectrum was also used to study the stress status in chromic scale formed on the surface of Co-40Cr with and without yttrium. The main reason for the improvement of resistant to oxidation property of Y-doped Co-40Cr probably is that yttrium can segregate to Cr2O3 grain boundaries and change the scale′s growing mechanism and mechanical property. Most importantly, Y-implantation decreases the size and number of interfacial defects and the residual stress in the scale, and remarkably enhances the adhesion of chromia scale with Co-40Cr substrate.
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