| 稀土铁铬铝合金的高温氧化TEM研究 |
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| 引用本文： | 杜国维, 袁之良, 肖治纲. 稀土铁铬铝合金的高温氧化TEM研究[J]. 工程科学学报, 1993, 15(4): 408-413. DOI: 10.13374/j.issn1001-053x.1993.04.017 |
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| 作者姓名： | 杜国维 袁之良 肖治纲 |
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| 摘 要： | 通过透射电镜对Fe-25%Cr-6%Al-RE(富镧)合金氧化行为进行研究.结果表明:经1200℃恒温2h纯氧中氧化,合金中镧以六方La2O3微小颗粒沉淀在氧化膜中α-Al2O3晶粒的顶端及晶界上。它们阻碍铝向表面扩散,抑制氧化膜的侧向生长;在1200℃/室温之间热循环氧化历程.稀土组元加快了合金的内氧化。它们以氧化铝、氧化镧形式出现,在靠近氧化膜/金属界面,立方La2O3颗粒平行于晶界并在合金基体上沉积。
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| 关 键 词： | La2O3沉淀 内氧化 热循环氧化 |
| 收稿时间： | 1992-11-12 |
TEM Studies of Oxidized Iron-Chrominum-Aluminium-Rare Earth Alloy Cross Sections |
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| Du Guowei, Yuan Zhiliang, Xiao Zhigang. TEM Studies of Oxidized Iron-Chrominum-Aluminium-Rare Earth Alloy Cross Sections[J]. Chinese Journal of Engineering, 1993, 15(4): 408-413. DOI: 10.13374/j.issn1001-053x.1993.04.017 |
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| Authors: | Du Guowei Yuan Zhiliang Xiao Zhigang |
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| Abstract: | The oxidation behavior of Fe-25%Cr-6%Al-RE(rich Lanthanum) alloy in pure oxygen at 1 200℃ has been examined by transmission electron microscopy. It was shown:after oxidation at 1 200℃ for 2 h Lanthanum in alloy precipitated as hexagonal structure La2O3 particles at the top of α-Al2O3 grains or the grain boundaries in the oxide scale. The aluminium atoms outward diffusion and the lateral growth of the oxide scale are prenvented; during 1 200℃/room temperature thermal cyclic oxidation, rare, earth elements could speed up internal oxidation rate as alumina and lanthanum oxide appeared. A cubic La2O3 particles parallel to the grain boundaries in the alloy. |
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| Keywords: | La2O3 percipitation internal oxidation thermal cyclic oxidation |
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