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稀土氧化鑭摻雜鉬合金的強(qiáng)化機(jī)制研究
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TG146.412

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國(guó)家高技術(shù)研究發(fā)展計(jì)劃（863計(jì)劃）（2003AA33X040）


The Strengthening Mechanism of Rare Earth Lanthanum Oxide Doped Molybdenum Alloys
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    摘要:

    使用粉末冶金工藝制備了不同體積分?jǐn)?shù)稀七氧化鑭顆粒摻雜的鉬合金。觀察了該合金的顯微組織并測(cè)試了其力學(xué)性能。結(jié)果表明，稀士氧化鑭摻雜鉬合金由于其細(xì)小的氧化鑭顆粒和細(xì)小的晶粒的作用而具有較高的屈服強(qiáng)度。對(duì)稀士氧化鑭摻雜鉬合金強(qiáng)化機(jī)制的分析結(jié)果表明，鉬合金的屈服強(qiáng)度主要來(lái)源于三個(gè)部分：變形前基體強(qiáng)度、細(xì)小稀士氧化鑭顆粒貢獻(xiàn)的強(qiáng)度和細(xì)小鉬合金晶粒貢獻(xiàn)的強(qiáng)度，并給出了稀土氧化鑭摻雜鉬合金屈服強(qiáng)度與稀土氧化鑭顆粒尺寸、體積分?jǐn)?shù)以及晶粒尺寸之間的定量解析關(guān)系。

    Abstract:

    The rare earth lanthanum oxide doped molybdenum alloys containing different volume fraction lanthanum oxide particles were prepared by powder metallurgical processing. The microstructure and mechanical properties of the alloys were examined. It is found that the alloy has the fine lanthanum oxide particles and fine grain as well as high yield strength. The strengthening mechanism of the alloy is analyzed and explained in three aspects: matrix strengthening, fine grain size strengthening yielding Hall-Petch relationship, and fine particles strengthening according to the Orowan model. The quantitative relationships between the yield strengths of the alloys and the sizes, volume fraction of lanthanum oxide particles and the grain sizes were also presented.

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張國(guó)君 孫院軍 牛榮梅 孫軍 魏建峰 欒永剛 趙寶華 楊劉曉 馬保平.稀土氧化鑭摻雜鉬合金的強(qiáng)化機(jī)制研究[J].稀有金屬材料與工程,2005,34(12):1926~1929.[Zhang Guojun, Sun Yuanjun, Niu Rongmei, Sun Jun, Wei Jianfeng, Lan Yonggang, Zhao Baohua, Yang Liuxiao, Ma Baoping. The Strengthening Mechanism of Rare Earth Lanthanum Oxide Doped Molybdenum Alloys[J]. Rare Metal Materials and Engineering,2005,34(12):1926~1929.]
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  • 收稿日期:2004-09-03
  • 最后修改日期:2005-09-14
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