Abstract We demonstrate large, crystallographic anisotropy in nonequilibrium solute capture. Under identical conditions, differently oriented grains of a Ni-30Cr (wt.%) alloy were oxidized at 600°C for 60 s. For a Ni(Cr) (100) oriented grain, a solute captured rock salt oxide formed with a cube-cube epitaxial orientation. In contrast, for a Ni(Cr) (111) oriented grain, a solute captured corundum oxide formed with the (0001) basal plane parallel to (111). There are clear indications from the morphologies that are present – islands growing outwards for rock salt and islands growing inwards for corundum – that the oxide growth is dominated by kinetics, not thermodynamic factors. Since the interfacial conditions for nonequilibrium solute capture differ for cases where the metal/oxide boundary is moving (the (111) case) and where it is not (the (100) case), these results indicate that crystallographic anisotropy will have substantial effects which cannot be ignored in oxidation or corrosion.

中文翻译：

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非平衡溶质捕获的晶体各向异性

摘要 我们在非平衡溶质捕获中展示了大的晶体各向异性。在相同条件下，Ni-30Cr (wt.%) 合金的不同取向晶粒在 600°C 下氧化 60 秒。对于 Ni(Cr) (100) 取向的晶粒，溶质捕获的岩盐氧化物形成立方体外延取向。相比之下，对于 Ni(Cr) (111) 取向的晶粒，溶质捕获的刚玉氧化物形成的 (0001) 基面平行于 (111)。现有的形态有明确的迹象——岩盐的岛向外生长，刚玉的岛向内生长——氧化物的生长主要受动力学因素的影响，而不是热力学因素。