2,小片層次組織的合金的氧化增重為6.45 g/cm2。對(duì)合金截面進(jìn)行觀察后發(fā)現(xiàn),大小片層團(tuán)兩種合金表面氧化物的厚度分別為7μm和5μm。通過(guò)對(duì)氧化動(dòng)力學(xué)曲線、組織結(jié)構(gòu)、氧化膜結(jié)構(gòu)、氧化表面形貌進(jìn)行綜合分析,表明TiAl合金的片層團(tuán)大小對(duì)其氧化行為具有不可忽視的影響。"/>

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具有不同大小片層團(tuán)的Ti–Al–Nb–W-B–Y合金的等溫氧化行為
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西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室

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TG146.2

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國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃資助（2011CB605503）


Isothermal oxidation behavior of TiAl–Nb–W–B-Y alloys with different lamellar colony sizes
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072

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    摘要:

    以Ti-42.5Al-8Nb-0.2W-0.2B-0.1Y (at. %)合金為研究對(duì)象,通過(guò)熱處理獲得不同大小片層團(tuán)的兩種全片層顯微組織,并在900 ℃空氣條件下,進(jìn)行了100 h的抗氧化性實(shí)驗(yàn)。利用OM、SEM、TEM、XRD和EDS對(duì)試樣的微觀結(jié)構(gòu)、相組成及微區(qū)成分進(jìn)行了分析。恒溫氧化動(dòng)力學(xué)結(jié)果表明：在900 ℃空氣條件下,具有兩種不同大小全片層組織的TiAl合金,其恒溫氧化動(dòng)力學(xué)曲線符合近拋物線規(guī)律,且大片層組織合金的抗氧化性能優(yōu)于小片層組織。氧化100小時(shí)后,大片層組織的合金其氧化增重為7.62 g/m2,小片層次組織的合金的氧化增重為6.45 g/cm2。對(duì)合金截面進(jìn)行觀察后發(fā)現(xiàn),大小片層團(tuán)兩種合金表面氧化物的厚度分別為7μm和5μm。通過(guò)對(duì)氧化動(dòng)力學(xué)曲線、組織結(jié)構(gòu)、氧化膜結(jié)構(gòu)、氧化表面形貌進(jìn)行綜合分析,表明TiAl合金的片層團(tuán)大小對(duì)其氧化行為具有不可忽視的影響。

    Abstract:

    The oxidation behavior of a full-lamellar Ti-42.5Al-8Nb-0.2W-0.2B-0.1Y alloys with different colony sizes was investigated by using thermogravimetric method at 900℃ for 100 hours in air. The microstructure and composition of the alloy as well as the oxide scales were analyzed by OM, SEM, EDS and XRD. It was found that the oxidation kinetic of the present TiAl alloys accorded with the parabolic law, and the alloy with larger lamellar colony have a better oxidation resistance than that of the one with smaller lamellar colony. The weight gain after 100 h oxidation was 7.62 g/m2 and 6.45 g/cm2, respectively for these two alloys, and correspondingly the thickness of oxide scale was about 7μm and 5μm, respectively. Base on the analysis of oxidation kinetic and microstructure characterization, we concluded that lamellar colony size has a significant effect on the oxidation behavior of TiAl alloys.

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劉杰,薛祥義.具有不同大小片層團(tuán)的Ti–Al–Nb–W-B–Y合金的等溫氧化行為[J].稀有金屬材料與工程,2016,45(7):1695~1699.[Jie Liu, Xiangyi Xue. Isothermal oxidation behavior of TiAl–Nb–W–B-Y alloys with different lamellar colony sizes[J]. Rare Metal Materials and Engineering,2016,45(7):1695~1699.]
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  • 收稿日期:2016-01-21
  • 最后修改日期:2016-04-27
  • 錄用日期:2016-04-29
  • 在線發(fā)布日期: 2016-10-09
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