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首页> 外文期刊>Journal of Materials Research >Initial stages of oxidation of Ti45A17Nb0.4Y alloy at 900 ℃ in air
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Initial stages of oxidation of Ti45A17Nb0.4Y alloy at 900 ℃ in air

机译：空气中900℃下Ti45A17Nb0.4Y合金的氧化初期

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摘要

The initial stage of oxidation of Ti45A17Nb0.4Y alloy (at.%) oxidized at 900 ℃ in air was investigated by using x-ray photoelectron spectroscopy and Auger electron spectroscopy. Experimental results revealed that YAI_2 segregated along the grain boundaries preferentially oxidized to Y_2O_3 and AI_2O_3 due to strong affinity of Y to oxygen. Oxides grew faster at the grain boundaries than in lamellar colonies. As a result, Y and Al oxides pegs protruded into the substrate, which can increase the contact areas of oxide scale and substrate. Moreover, inward diffusion of oxygen more easily occurred along the grain boundaries. As a result, it promoted the external oxidation of Al within the grains due to lower inward diffusion flux of oxygen. And coarse-grained Y_2O_3 blocked the cationic intergranular diffusion. Therefore, Y addition can effectively enhance the A1_2O_3 layer and suppress the TiO_2 outermost layer.
机译：利用X射线光电子能谱和俄歇电子能谱研究了在空气中900℃下氧化的Ti45A17Nb0.4Y合金（at。％）的氧化初期。实验结果表明，由于Y对氧的强亲和力，沿晶界偏析的YAI_2优先氧化为Y_2O_3和AI_2O_3。氧化物在晶界的生长快于层状菌落。结果，Y和Al的氧化物钉突出到衬底中，这可以增加氧化物鳞片和衬底的接触面积。而且，氧更容易沿着晶界发生向内扩散。结果，由于较低的氧向内扩散通量，它促进了晶粒内Al的外部氧化。 Y_2O_3粗粒阻碍了阳离子的晶间扩散。因此，添加Y可以有效地增强Al_2O_3层并抑制TiO_2最外层。

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  • 来源
    《Journal of Materials Research》 |2010年第6期|1204-1210|共7页
  • 作者

    L.L. Zhao; J.P. Lin; L.Q. Zhang; X.P. Song; F. Ye; G.L. Chen;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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