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Nb、Mo對TiAl基合金高溫氧化行為的協(xié)同效應(yīng)研究
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國家自然科學(xué)基金(51001086)，國家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃(“973”計(jì)劃)(2011CB605503)和西北工業(yè)大學(xué)基礎(chǔ)研究基金(JC201007)資助


Synergistic Effect of Nb and Mo on Oxidation Behavior of TiAl-Based Alloys
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    摘要:

    采用冷坩堝懸浮熔煉技術(shù)制備Nb、Mo合金化的TiAl基合金，研究合金在大氣環(huán)境中的高溫長時(shí)氧化行為。采用X射線衍射、掃描電鏡及能譜分析研究氧化層的相結(jié)構(gòu)、顯微組織及與基體合金的界面特征，結(jié)合氧化動力學(xué)測試研究Nb、Mo對TiAl基合金高溫抗氧化行為的協(xié)同效應(yīng)。結(jié)果發(fā)現(xiàn)，Nb、Mo協(xié)同作用較單一元素合金化的TiAl合金具有更為優(yōu)良的高溫抗氧化性，連續(xù)致密且與基體良好結(jié)合的氧化膜可明顯降低合金的氧化速率、減小氧化增重。Nb、Mo摻雜的TiAl基合金氧化層可阻止氧原子向內(nèi)擴(kuò)散，Nb、Mo的協(xié)同效應(yīng)有助于改善TiAl基合金的高溫抗氧化性。

    Abstract:

    TiAl-based alloys with Nb/Mo were obtained by the cold crucible induction levitation melting method. The oxidation behavior in air at 900 oC for long time was investigated. The phase composition, microstructure and the interface of the oxidation film and the matrix were investigated by means of XRD and SEM equipped with EDS. Combined with the oxidation kinetic analysis, the synergistic effect of Nb and Mo on the oxidation behavior of TiAl-based alloys was explored. With the addition of Nb and Mo, the continuous compact oxidation film decreases the oxidating rate and the mass gain which makes the alloy preserve better oxidation properties compared with that of Ti-46Al-6Nb. Due to the synergistic effect of Nb and Mo, the indiffusion of oxygen atoms can be prevented and the oxidation properties of TiAl-based alloys can be improved.

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張鐵邦,丁 浩,鄧志海,鐘 宏,胡 銳,薛祥義,李金山. Nb、Mo對TiAl基合金高溫氧化行為的協(xié)同效應(yīng)研究[J].稀有金屬材料與工程,2012,41(1):33~37.[Zhang Tiebang, Ding Hao, Deng Zhihai, Zhong Hong, Hu Rui, Xue Xiangyi, Li Jinshan. Synergistic Effect of Nb and Mo on Oxidation Behavior of TiAl-Based Alloys[J]. Rare Metal Materials and Engineering,2012,41(1):33~37.]
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  • 收稿日期:2010-12-15
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