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Electron microscopy studies of the high temperature oxidation behaivor of NiAl

机译:NiAl高温氧化行为的电子显微镜研究

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The transient oxidation stage of single crystal (001)NiAl was investigated usifng scanning electron microscopy, transmission electron microscopy. electron diffraction, high resolution electron microscopy and electron energy loss spectroscopy (EELS). (001)NiAl was oxidized in air at 950 deg C in order to produce transient forms of alumina on the surface. After oxidation, an oxide scale with plate-like surface morphology formed. We found that the main transient alumina polymorph is gamma -Al_2O_3. The platelets which formed on the surface of the oxide are most likely gamma -Al_2O_3, not theta -Al_2O_3.Randomly-oriented alpha -Al_2O_3 grains were observed at the oxide/metal interface. The NiAl/ gamma -Al_2O_3 interfaces were examined with EELS. From the changes observed in the electron energy loss spectra, the interfacial terminating plane is determined. Lattice matching the electron energy loss spectra, the interfaciall terminating plane is determined. Lattice matching argumentsare given to explain why these terminating planes are energeticaly favorable.
机译:利用扫描电子显微镜,透射电子显微镜研究了单晶(001)NiAl的瞬时氧化阶段。电子衍射,高分辨率电子显微镜和电子能量损失谱(EELS)。 (001)NiAl在950摄氏度的空气中被氧化,以在表面上产生氧化铝的过渡形式。氧化后,形成具有板状表面形态的氧化皮。我们发现主要的瞬态氧化铝多晶型物是γ-Al_2O_3。在氧化物表面上形成的血小板很可能是γ-Al_2O_3,而不是θ-Al_2O_3。在氧化物/金属界面处观察到了随机取向的α-Al_2O_3晶粒。用EELS检查了NiAl /γ-Al_2O_3界面。根据在电子能量损失谱中观察到的变化,确定界面终止平面。晶格匹配电子能量损失谱,确定界面终止平面。给出晶格匹配的参数来解释为什么这些终止平面在能量上是有利的。

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