The influence of the reactive element yttrium on the stress in alumina scales formed by oxidation
The influence of the reactive element yttrium on the stress in alumina scales formed by oxidation
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DOI：
10.1016/s1359-6454(96)00258-3
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发表时间：
1997-04
期刊：
影响因子：
9.4
通讯作者：
R. Christensen;V. Tolpygo;D. Clarke
中科院分区：
文献类型：
--
作者：
R. Christensen;V. Tolpygo;D. Clarke
向高温合金中添加反应性元素（例如钇）显著改善了热生长氧化物膜的粘附性，但是对于这种改善行为的原因仍然没有达成一致。一些提出的机制是基于这样的前提，即钇有助于降低氧化物中的残余压应力，从而降低氧化物皮剥落的驱动力。本研究遵循三种氧化铝形成合金组合物中的氧化物应力发展，每种组合物在不同的氧化时间和温度下添加和不添加钇。在氧化皮中的应力在室温下使用压电光谱技术进行测量。结果清楚地表明，钇的添加不会降低氧化皮中的残余应力，但至少在短的氧化时间内使它们更具压缩性。
The addition of reactive elements, such as yttrium, to high temperature alloys significantly improves the adherence of thermally-grown oxide scales but there is still no agreement as to the reason for this improved behavior. Some of the proposed mechanisms are based on the premise that yttrium helps to decrease the residual compressive stress in the oxide, thus decreasing the driving force for spalling of the oxide scale. This investigation followed the oxide stress development in three alumina-forming alloy compositions, each with and without an addition of yttrium over various oxidation times and temperatures. The stress in the oxide scales were measured at room temperature using a piezospectroscopic technique. The results clearly show that the addition of yttrium does not decrease the residual stress in the scales but makes them more compressive, at least at short oxidation times.