The role of Cr and Si in affecting high-temperature oxidation behaviour of minor Dy doped NiAl alloys

The role of Cr and Si in affecting high-temperature oxidation behaviour of minor Dy doped NiAl alloys
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Cr和Si对少量Dy掺杂NiAl合金高温氧化行为的影响

DOI:
10.1016/j.corsci.2013.08.020
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发表时间:
2013-12
期刊:
影响因子:
8.3
通讯作者:
Gong, Sengkai
Gong, Sengkai
中科院分区:
材料科学1区
文献类型:
--
作者:
Peng, Hui;Zhang, Yanli;Zhang, Tian;Gong, Sengkai

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研究了 Cr/Si 共掺杂 NiAlDy 合金在 1200 °C 下的等温和循环氧化行为。结合实验结果和第一性原理计算讨论了Cr和Si在NiAlDy合金氧化中的作用。 Cr和Si会在晶界共偏析,促进氧化初期θ-Al2O3向α-Al2O3的转变。 NiAlDyCr-3Si 合金在 100 小时等温氧化后质量增加了 ∼0.64 mg/cm2,并且由于 Si 和 Cr 之间的成对亲和力可以减轻界面 Cr 沉淀的有害影响,因此表现出显着改善的循环氧化性能。
Isothermal and cyclic oxidation behaviour of Cr/Si co-doped NiAlDy alloys were investigated at 1200 °C. The role of Cr and Si in oxidation of NiAlDy alloys was discussed by combining experimental results and first-principles calculations. Cr and Si would co-segregate at grain boundaries and promoted the transformation from θ-Al2O3to α-Al2O3at initial oxidation stage. The NiAlDyCr–3Si alloy yielded a mass gain of ∼0.64 mg/cm2after 100 h isothermal oxidation and showed much improved cyclic oxidation resistance due to the pair affinity between Si and Cr which can alleviate the deleterious effect of interfacial Cr precipitation.
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