摘要
研究了Ni3Al-Mo合金在1100℃下暴露时间为1h的氧化行为,利用扫描电子显微镜(SEM)、能量衍射谱(EDS)和X射线衍射等手段观察分析了氧化层的表面形貌、微观组织结构成分,并结合氧化动力学曲线分析,探明了Ni3Al-Mo合金1100℃高温氧化初期的氧化机理。研究结果表明,在1100℃氧化初期(1 h内),Ni3Al-Mo合金表面氧化层中存在一个富Mo层,并随着时间延长而增厚,表明合金中Mo元素没有发生氧化挥发。1100℃时Ni3Al-Mo合金试样表面形成NiO+富Mo层+NiAl2O4多层结构氧化层。随着氧化时间的增长,形成NiO层的颗粒逐渐增大,氧化层孔隙增多变得疏松,与基体结合力减弱,试样从炉中取出,在冷却过程中由于NiO氧化层热膨胀系数大,致使氧化层翘曲并剥落。
The oxidation behavior of Ni3Al-Mo alloy at 1100℃ within 1 h was investigated. Surface morphology of oxide layer, element distribution and the oxide structure were investigated by SEM, EDS, and XRD. The oxidation dynamics curves was obtained. The results show that, compact NiO layer formed during the initial stage of oxidation, NiO layer detarded the volatilization of MoO3 and a Mo-rich layer （1-2 μm thick） are formed under the NiO layer. However, the particle size of NiO grows with the increase of time, the NiO layer became loose and then part of the layer spalled from the surface. This is why Mo is responsible for deterioration of initial stage oxidation property of Ni3Al-Mo alloy.
出处
《热加工工艺》
CSCD
北大核心
2012年第8期38-41,共4页
Hot Working Technology
