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| EFFECTS OF RARE EARTH ON PREFERRED ORIENTATION IN OXIDE SCALE O FA Fe-Cr-Al ALLOY |
| by Zhang Lixin; Luo Jixun; Yin Yaode and Li Liguang (Institute of Metal Research; Academia Sinica) Zhao Qi and Zhang Jiayun |
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Cite this article:
by Zhang Lixin; Luo Jixun; Yin Yaode and Li Liguang (Institute of Metal Research; Academia Sinica) Zhao Qi and Zhang Jiayun. EFFECTS OF RARE EARTH ON PREFERRED ORIENTATION IN OXIDE SCALE O FA Fe-Cr-Al ALLOY. Acta Metall Sin, 1981, 17(3): 233-242.
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Abstract The effects of RE additions, 0.5% Y or 0.15% (La+Ce), on the prefe ed orientation of oxide scale formed at 1200℃ in a Fe-Cr-Al alloy have been studied by inverse-pole-figure method. It was found that the addition of RE element affects the types of preferred orientation to a limited extent.The main preferred orientation in the oxide scale on three tested alloys are identical as (0118);whereas some differences are shown among their minor ones with (1129)and (10110) for alloys containing Y or La+Ce, and (0001) and (10110) for an alloy without RE. RE can play an important part in conserving and enhancing the preferred orientations in the scale, among which Y has a more remarkable effect than La+Ce.The oxidation process of the alloys was discribed by the shortcircuit dislocation path model. This model makes the variation curve of P_1011 parameter of the oxide scale in good agreement with the variation curves of oxidation dynamics. This accounts for the fact that RE elements improve the oxidation resistance of the alloy through their effect on modifying the preferred orientation of the oxide scale.
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Received: 18 March 1981
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