Microstructural study of the theta-alpha transformation in alumina scales formed on nickel-aluminides
Microstructural study of the theta-alpha transformation in alumina scales formed on nickel-aluminides
复制标题
DOI：
10.1179/mht.2000.011
复制
发表时间：
2000-01-01
影响因子：
1.3
通讯作者：
Clarke, DR
中科院分区：
文献类型：
--
作者：
Tolpygo, VK;Clarke, DR
发光光谱和扫描电子显微镜已被用来研究在 1,000-1,200 摄氏度的氧化初始阶段，高温合金上的铂改性铝化镍 (Ni,Pt)Al 粘结层表面从 θ-Al2O3 到 α-Al2O3 的转变。根据表面粗糙度，转变可以通过多种方式进行，从而产生稳定的 α-氧化铝鳞片的不同微观结构。使用发光方法可以通过 α 和 θ 氧化铝光谱的压电光谱位移将氧化物的微观结构特征与局部应力相关联。
Luminescence spectroscopy and scanning electron microscopy have been used to study the transformation from theta-Al2O3 to alpha-Al2O3 on the surface of platinum-modified nickel aluminide, (Ni,Pt)Al, bond coats on superalloys during initial stages of oxidation at 1,000-1,200 degrees C. The transformation can proceed in a number of ways, depending on the surface roughness, leading to different microstructures of the stable alpha-alumina scale. The use of the luminescence method makes it possible to correlate microstructural features of the oxide with the local stress through piezospectroscopic shifts of both alpha- and theta-alumina optical spectra.