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晶粒細(xì)化對(duì)Cr-25Nb合金高溫氧化行為的影響
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國(guó)家自然科學(xué)基金(50474009)；航空科學(xué)基金（05G56003）; 博士啟動(dòng)基金(EA200901372); 江西省材料工程中心項(xiàng)目(ZX200901002)


Effects of Grain Refinement on High Temperature Oxidation Behavior of Cr-25Nb Alloys
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    摘要:

    采用電弧熔鑄和機(jī)械合金化+熱壓燒結(jié)技術(shù)制備晶粒尺寸相差較大的Cr-25Nb合金，研究其在950及1200 ℃空氣中的氧化行為。結(jié)果表明，熔鑄態(tài)及機(jī)械合金化Cr-25Nb合金氧化后均沒(méi)有發(fā)生Cr的單一外氧化，而形成了以Cr2O3為外層、NbCrO4為內(nèi)層的雙層氧化膜結(jié)構(gòu)；機(jī)械合金化Cr-25Nb合金在950及1200 ℃的氧化速度均小于熔鑄態(tài)合金，特別是在1200 ℃氧化100 h后，熔鑄態(tài)Cr-25Nb合金的氧化增重是機(jī)械合金化合金的2倍多。這主要是因?yàn)榫Я＜?xì)化促進(jìn)了氧化膜內(nèi)應(yīng)力的釋放，提高了氧化膜與基體的粘附性

    Abstract:

    In order to discuss the influence of grain refinement on the oxidation behavior of binary two-phase alloys, Cr-25Nb alloys with different grain sizes were prepared by arc-casting and mechanical alloying, and their oxidation behaviors at 950 and 1200 oC in air were investigated. The results show that in both alloys a single and continuous Cr2O3 film did not form, but a complex oxidation films occurred which contained an outer layer of Cr2O3 plus an inner layer of NbCrO4. The oxidation resistance of mechanically alloyed Cr-25Nb was higher than that of the cast alloy. In particular, the mass gain of the cast alloy is twice as much as that of mechanically alloyed alloy when they were oxidized at 1200 oC for 100 h. The differences observed above are attributed to that fine grains can accelerate the relaxation of the oxide scale stress and increase the adhesion of the oxide layer on the matrix

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鄭海忠,魯世強(qiáng).晶粒細(xì)化對(duì)Cr-25Nb合金高溫氧化行為的影響[J].稀有金屬材料與工程,2010,39(10):1802~1806.[Zheng Haizhong, Lu Shiqiang. Effects of Grain Refinement on High Temperature Oxidation Behavior of Cr-25Nb Alloys[J]. Rare Metal Materials and Engineering,2010,39(10):1802~1806.]
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  • 收稿日期:2009-09-23
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