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Ti60高溫鈦合金氧化行為研究
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國(guó)家“973”計(jì)劃（2007CB613807）；新世紀(jì)優(yōu)秀人才支持計(jì)劃（NCET-07-0696）


Oxidation Behavior of Near α-Titanium Alloy Ti60
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    摘要:

    研究Ti60高溫鈦合金在600~750 ℃范圍內(nèi)的氧化行為。氧化增重試驗(yàn)及XRD、SEM分析結(jié)果表明，Ti60合金在600~750 ℃范圍內(nèi)氧化0~100 h條件下，由Wagner的氧化經(jīng)驗(yàn)公式計(jì)算得氧化指數(shù)n在1~2之間，氧化激活能為256 kJ/mol，氧化符合線性-拋物線混合規(guī)律。在600 ℃氧化100 h及750 ℃氧化10 h，氧化產(chǎn)物為T(mén)iO2，經(jīng)750 ℃、100 h長(zhǎng)時(shí)間氧化后，表面有少量Al2O3生成，氧化物優(yōu)先沿原始β晶界形核。氧除了會(huì)在試樣表面形成氧化層外，還會(huì)向基體中擴(kuò)散形成脆性富氧層，從而影響合金力學(xué)性能。隨著氧化溫度的升高和時(shí)間的延長(zhǎng)，富氧層厚度增厚。

    Abstract:

    Air oxidation behavior of Ti60 alloy was studied in the temperature range from 600 oC to 750 oC. In addition to the determination of the oxidation kinetics by mass gain measurements, the morphology of the scales formed was observed by SEM and the phases present in the scales were characterized by X-ray diffraction. Results show that under the condition of oxidation at 600-750 oC for 0-100 h, the oxidation exponent n is between 1 and 2 calculated by oxidation experience formula of Wagner, the total oxidation energy is 256 kJ/mol, and the oxidation kinetics follows the linear-parabolic law. When Ti60 alloy was oxidized at 600 oC for 100 h or at 750 oC for 10 h, the oxidation product is TiO2, while there was a little Al2O3 on the surface when the alloy was oxidized at 750 oC for 100 h. The oxides were preferentially formed at the grain boundaries of the alloy. Besides the oxidation layer on the sample surface, oxygen also dissolves into the matrix to form brittle oxygen-enriched layer resulting in the mechanical property change. The oxygen-enriched layer was thickened with the increase of oxidation temperature and prolonging of the oxidation time.

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賈蔚菊,曾衛(wèi)東,劉建榮,王青江,周義剛. Ti60高溫鈦合金氧化行為研究[J].稀有金屬材料與工程,2010,39(5):781~786.[Jia Weijü,Zeng Weidong, Liu Jianrong, Wang Qingjiang, Zhou Yigang. Oxidation Behavior of Near α-Titanium Alloy Ti60[J]. Rare Metal Materials and Engineering,2010,39(5):781~786.]
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  • 收稿日期:2009-05-10
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