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OXIDATION OF Ag-8Y DUAL-PHASE ALLOY in 105 and 10-15 Pa OXYGEN at 700℃ |
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沈阳 中科院金属研究所 |
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Abstract The oxidation of a silver-based alloy Ag-8Y was studied in 105 Pa and 10-1 5 Pa oxygen at 700℃.The oxidation rate under high P(O2) is very fast and f ollows approximately parabolic rate law,however under low P(O2) is much sl ower and quite irregular with large deviations from parabolic behavior.Under hig h P(O2) the alloy experiences only an internal oxidation of Y without any significant outward Y diffusion,as a result of a fast oxygen penetration.Under l ow P(O2)the alloy forms an almost continuous Y2O3 layer containing Ag particles,plus an internal oxidation zone of Y much thinner than under high P (O2).In both cases pure Ag metal appears on the top surface as a continuous layer for high P(O2) and as separate particles for low P(O2).The int ernal Y2O3 particles in the matrix change shape with depth,being small and g lobular close to the alloy surface but larger and acicular,elongated nearly perp endicularly to the alloy surface,at larger depths.
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Received: 17 April 2000
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[1]LangL .Ed.TheRoleofActiveElementsintheOxidationBehaviorofHighTemperatureMetalsandAlloys[M].London:El sevierAppliedScience,1989 [2]MassalskiT .BinaryAlloysPhaseDiagrams[M ],Warrendale:ASM ,USA ,1990 [3]GesmundoF ,VianiF ,NiuY .Theinternaloxidationoftwo- phasebinaryalloysunderlowoxidantpressures[J].Oxid.Met.,1996,45:51 [4]GesmundoF ,VianiF ,NiuY .Theinternaloxidationoftwo-phasebinaryalloysbeneathanexternalscaleofthelessstableox ide[J].Oxid.Met.,1997,47:355 [5]KofstadP .HighTemperatureCorrosion[M ].London:ElsevierAppliedScience,1988 [6]VerfurthJE ,RappRA .Thesolubilityanddiffusivityofoxygeninsilverandcopperfrominternaloxidationmeasurements[J].Trans.Met.Soc.AIME ,1964,230:1310 [7]GaskellDR .IntroductiontotheThermodynamicsofMaterials[M ].Washington:Taylor&Francis,1995 [8]WuWT ,YanRY ,NiuY ,GesmundoF .TheoxidationofaCo-15wt%Yalloyunderlowoxygenpressuresat600~800℃[J].Corros.Sci.,1997,39:1831 [9]NiuY ,YanRY ,FuGY ,WuWT ,GesmundoF .TheoxidationoftwoFe-Yalloysunderlowoxygenpressuresat600~800℃[J].Oxid.Met.,1998,49:91 [10]FuGY ,NiuY ,WuWT ,GesmundoF .TheoxidationofaCo-15wt%Cealloyunderlowoxygenpressuresat600~800℃[J].Corros.Sci.,1998,40:1215 [11]NiuY ,LiYS ,GesmundoF ,VianiF .TheoxidationofaCo-15wt% yttriumalloyin1atmO2 at600~800℃[J].Inter metallics,2000,8:293 [12]NiuY ,GesmundoF ,VianiF ,WuWT .Theairoxidationoftwo-phaseCu-Agalloysat650~750℃[J].Oxid.Met.,1997,47:21 [13]DouglassDL .Oxid.Met.,1995,44:81 [14]BohmG ,KahlweitM .UberdieInnereoxydationvonmetallegierungen[J].ActaMet.,1964,12:641 [15]GuruswamyS ,ParkSM ,HirthJP ,RappRA .InternaloxidationofAg-Inalloys:stressreliefandtheinfluenceofimposedstrain[J].Oxid.Met.,1986,26:77 |
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