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INFLUENCE OF YTTRIUM IMPLANTATION ON OXIDATION BEHAVIOR OF cO-40cR(WT%)ALLOY |
Huiming Jin;;; |
中科院金属所;金属腐蚀与防护国家重点实验室 |
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Abstract Isothermal and cyclic oxidation behavior of Co-40Cr(wt%) alloyin air at 1000℃ was evaluated.SEM/EDXA was used to examine the scale formed on the alloy.By comparing the different oxidation behavior of Co-40Cr alloys which were implanted with 3×10 16Y+ and 3×10 17Y+/cm2 or unimplanted,it was found that only Cr2O3 scale was ormed on all alloys with and without implanted yttrium,but the oxidation resistance of the alloy was greatly inproved by yttrium implantation.SIMS method was also used to examine the yttrium concentration depth profile.The main reason for the improvement os that yttrium can segregate at Cr2O3 grain boundaries,This may change the scale growth mechanism rom predominant Cr3+ cation outward diffusion to predominant O2- anion inward diffusion, and greatly decrrase the diffusion rate.In the mean time,yttrium implantation inhibited the formation of "Kirkendall"holes at the scale / alloy interface,thus remarkabl enhanced the adhesion of the scale formed on yttium-implanted Co-40Cr alloy.
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Received: 18 July 2005
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Corresponding Authors:
Huiming Jin
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1Hou P U, Stringer J. Oxidation of Metals, 1988, 29(1/2): 45 2Przybylski K, Yurek G J.J.Electrochem. Soc, 1988; 135: 509 3Kuenzly J D;Douglass D L. Oxidation of Metals, 1974; 8: 139 4Rahmel A, Schutze M. Oxidation of Metals; 1992; 38: 314 5靳惠明,李铁藩等.中国稀土学报,1997,15:45 6靳惠明,李铁藩等.中国腐蚀与防护学报,1999,19(1): 50 |
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