2+γ片層組織,促進(jìn)合金中形成γ和B2相,并抑制α2相形成；合金中Co含量超過2 at.%會(huì)導(dǎo)致富Co相析出和組織粗化。1000℃空氣中的恒溫氧化結(jié)果表明,適量的Co合金化能夠顯著改善TiAl-Nb合金的高溫抗氧化性能；Ti45Al-6Nb-1Co合金的氧化的拋物線速率常數(shù)約為1.36×10-2mg2/cm4h,較Ti45Al-Nb合金低約1個(gè)數(shù)量級(jí)；但Co含量超過2 at.%后,隨Co含量增加,合金的氧化速率呈增加趨勢。"/>

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Co對(duì)鑄態(tài)TiAl-Nb合金組織和高溫氧化性能的影響
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作者單位:

1.西安建筑科技大學(xué);2.中聯(lián)西北工程設(shè)計(jì)研究院有限公司;3.四川輕化工大學(xué);4.西安建筑科技大學(xué)冶金工程學(xué)院

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中圖分類號(hào):

TG294

基金項(xiàng)目:

國家自然科學(xué)基金 (51961003); 陜西省重點(diǎn)研發(fā)計(jì)劃(2018GY-112)；陜西省重點(diǎn)產(chǎn)業(yè)創(chuàng)新鏈(群)2019ZDLGY05-03


Effects of Co on Microstructure and High Temperature Oxidation Properties of Cast TiAl-Nb Alloy
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Affiliation:

1.Xi''an University of Architecture and Technology;2.China United Northwest Institute for Engineering Design and Research Corporation;3.Sichuan University of Science and Engineering

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    摘要:

    采用非自耗電弧熔煉方法經(jīng)多次重熔制備了Ti45Al-6Nb-xCo合金(x=0, 0.5, 1, 2和4 at.%),研究了不同Co含量合金的組織結(jié)構(gòu)和高溫抗氧化性能。結(jié)果表明,增加合金中的Co含量能夠細(xì)化α2+γ片層組織,促進(jìn)合金中形成γ和B2相,并抑制α2相形成；合金中Co含量超過2 at.%會(huì)導(dǎo)致富Co相析出和組織粗化。1000℃空氣中的恒溫氧化結(jié)果表明,適量的Co合金化能夠顯著改善TiAl-Nb合金的高溫抗氧化性能；Ti45Al-6Nb-1Co合金的氧化的拋物線速率常數(shù)約為1.36×10-2mg2/cm4h,較Ti45Al-Nb合金低約1個(gè)數(shù)量級(jí)；但Co含量超過2 at.%后,隨Co含量增加,合金的氧化速率呈增加趨勢。

    Abstract:

    Ti45Al-6Nb-xCo (x=0, 0.5, 1, 2 and4 at.%) alloys were prepared using non- consumable arc melting method by three times of remelts. The microstructure and high temperature oxidation behavior of the alloys with different Co concentrations were investigated. The results show that increase of Co concentration in the alloy can significantly refine the α2+γ lamellaer, promote the formation of γ and B2 phases while inhibit the formation of α2 phase. Co-rich precipitates and microstructure coarsening were observed when concentration of Co is higher than 2 at.% in the alloy. The static oxidation results at 1000 ℃ in air show that the oxidation resistance of TiAl-Nb alloy has been remarkably improved by appropriate Co alloying. The oxidation parabolic rate constant of the Ti45Al-6Nb-1Co alloy is about 1.36×10-2mg2/cm4h, lower than that of the Ti45Al-Nb alloy by about one order of magnitude. However, once the concentration of Co exceeds 2 at.%, increase of Co concentration in the alloy lead to an increase of the oxidation rate of the alloy.

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張聰惠,田偉,李軒,田進(jìn). Co對(duì)鑄態(tài)TiAl-Nb合金組織和高溫氧化性能的影響[J].稀有金屬材料與工程,2020,49(10):3597~3603.[Zhang conghui, Tianwei, Lixuan and. Effects of Co on Microstructure and High Temperature Oxidation Properties of Cast TiAl-Nb Alloy[J]. Rare Metal Materials and Engineering,2020,49(10):3597~3603.]
DOI：10.12442/j. issn.1002-185X.20190943

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  • 收稿日期:2019-11-11
  • 最后修改日期:2019-12-05
  • 錄用日期:2019-12-10
  • 在線發(fā)布日期: 2020-11-04
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