离子注入钇对Ni-15Cr-6Al合金渗铝层高温氧化行为的影响

用热重分析及ＳＥＭ和ＸＲＤ等技术研究了离子注入１×１０（１５）、１×１０（１６）、１×１０（１７）Ｙ＋／ｃｍ２对Ｎｉ－１５Ｃｒ－６Ｃｌ合金渗铝层高温氧化行为、氧化膜形貌、相结构等的影响。注入这三种剂量的Ｙ＋对渗铝层的氧化动力学没有显著影响。离子注入１×１０（１７）Ｙ＋／ｃｍ２改变了渗铝层的氧化膜形貌，促进了氧化膜的塑性变形，从而使得氧化膜内应力释放更多，增强了氧化膜的粘附性。氧化股形貌的改变与氧化膜生长机制的改变有关。离子注入１×１０（１５）、１×１０（１６）Ｙ＋／ｃｍ２对渗铝层的氧化行为影响不大。

THE EFFECT OF Y-IMPLANTATION ON HIGH TEMPERATURE OXIDATION BEHAVIOR OF ALUMINIZED Ni-BASE ALLOY

The influences of implanted yttrium at doses of 1×10 17； 1×10 16；1×10 15Y+／cm2 on the high temperature oxidation behaviro of aluminized Ni-15Cr-6Al alloy were studied by electric thermal balance ,scanning electron microscopy（SEM）and X－ray diffraction(XRD).The results indicated that Y－implantation at the three doses had no effects on oxidation kinetics of the alloy．However，ion implantation dose of 1× 10 17 Y+／cm2 changed the oxide morphology and facilitated plastic deformation of the oxide scale， thus it altered the ways of stress relaxation in the scale and improved the scale adhension．The change of the oxide morphology might result from the change of growth mechanism of the oxide scale， Ion implantation doses of 1×10 16 1×10 15Y+／cm2 had only a little or no effect on the oxide scale morphology.