The stress and spalling behavior of the oxide scale formed on polycrystalline Ni3Al
The stress and spalling behavior of the oxide scale formed on polycrystalline Ni3Al
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DOI：
10.1016/1359-6454(96)00009-2
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发表时间：
1996-09
期刊：
影响因子：
9.4
通讯作者：
R. Christensen;D. M. Lipkin;D. Clarke
中科院分区：
文献类型：
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作者：
R. Christensen;D. M. Lipkin;D. Clarke
在室温下，用光学荧光压谱法测定了900-1200°C空气中多晶Ni_3Al表面氧化膜的残余应力。发现应力几乎与氧化时间或温度无关。相比之下，剥落行为强烈依赖于氧化温度，在1100°C以下不会发生，并且在1200°C下大量发生。在中温区（~ 1100°C），氧化膜的析出优先发生在Ni 3Al晶界附近。这归因于残余热失配应力驱动的屈曲不稳定性，并且由空隙形成和非平面界面结构引起，所述非平面界面结构由沿沿着Ni 3Al晶界的优先扩散引起。
The residual stress in the oxide scale formed on polycrystalline Ni3Al in air in the range of 900–1200°C was determined at room temperature using optical fluorescence piezospectroscopy. The stress was found to be almost independent of time or temperature of oxidation. In contrast, the spalling behavior was strongly dependent on the oxidation temperature, not occurring below 1100°C and profusely at 1200°C. In the intermediate temperature regime (∼ 1100°C), spallation of the oxide scale occurred preferentially in the vicinity of grain boundaries in the Ni3Al. This is attributed to a buckling instability driven by the residual thermal mismatch stress and induced by both void formation and a non-planar interface structure resulting from preferential diffusion along the Ni3Al grain boundaries.