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FeCrNiAl系高熵合金高溫氧化行為及組織演變研究
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哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,,金屬精密熱加工國家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,,金屬精密熱加工國家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,,金屬精密熱加工國家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,,金屬精密熱加工國家級(jí)重點(diǎn)實(shí)驗(yàn)室

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The oxidation behaviors of FeCrNiAl high entropy alloy and its microstructure evolution
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School of Materials Science and Engineering,Harbin Institute of Technology,,National Key Laboratory for Metal Precision Hot Processing of Metals,Harbin,Heilongjiang Province,School of Materials Science and Engineering,Harbin Institute of Technology,,National Key Laboratory for Metal Precision Hot Processing of Metals,Harbin,Heilongjiang Province,School of Materials Science and Engineering,Harbin Institute of Technology,,National Key Laboratory for Metal Precision Hot Processing of Metals,Harbin,Heilongjiang Province,School of Materials Science and Engineering,Harbin Institute of Technology,,National Key Laboratory for Metal Precision Hot Processing of Metals,Harbin,Heilongjiang Province

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    摘要:

    本文研究了FeCrNiAl系高熵合金的高溫氧化行為,建立了合金的氧化動(dòng)力學(xué)模型,同時(shí)借助XRD、SEM和能譜分析,對合金氧化物相結(jié)構(gòu)及形貌和成分進(jìn)行表征,分析了合金的氧化機(jī)理。研究表明合金在800-1000℃都是完全抗氧化的,隨著氧化溫度的提高,合金氧化速率先增加后減小,1000℃的平均氧化速率小于800℃的平均氧化速率；各個(gè)溫度下試樣單位面積的氧化增重與氧化時(shí)間的關(guān)系滿足拋物線規(guī)律,計(jì)算得到合金的氧化激活能為167.507KJ/mol；800℃下枝晶內(nèi)的氧化產(chǎn)物全部是棒狀的金紅石結(jié)構(gòu)TiO2,而枝晶間氧化產(chǎn)物則主要是片層狀、緊密相連的Cr2O3和TiO2；900℃和950℃下形成的氧化膜中主要氧化物均為TiO2,900℃還含有Cr2O3和Fe2O3,950℃氧化膜中還含有α-Al2O3。在1000℃合金表面僅形成致密的α-Al2O3薄膜,使合金表現(xiàn)出更為優(yōu)異的抗氧化性能。

    Abstract:

    The oxidation behaviors of FeCrNiAl high entropy alloy at high temperature were investigated in this paper, and the oxidation kinetics model was constructed. The phase structure, morphology and composition were characterized by XRD, SEM and EDS, and the oxidation mechanisms were analyzed. The results show that the alloy are all oxidation-resistant at 800-1000℃, the average oxidation rate in unite area in 100h increases with increasing temperature at first, then decrease and the average oxidation rate at 1000℃ is smaller than at 800℃.The relationship between weight increment in unite area and oxidation time for all temperatures meets parabola function, and the oxidation active energy was calculated to be 167.507KJ/mol. The oxidation products in dendrite at 800℃ are bar-shape TiO2 with rutile structure, while the interdendritic products are Cr2O3 and TiO2 which show plate shape. The oxidation products at 900℃ are TiO2, Cr2O3 and Fe2O3, while TiO2 and α-Al2O3 are observed at 950℃. Only tight α-Al2O3 film are gotten on the surface at 1000℃, which results in the more excellent oxidation-resistant property.

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劉勇,朱景川,趙曉亮,周易. FeCrNiAl系高熵合金高溫氧化行為及組織演變研究[J].稀有金屬材料與工程,2018,47(9):2743~2748.[Liu Yong, Zhu Jingchuan, Zhao Xiaoliang, Zhou Yi. The oxidation behaviors of FeCrNiAl high entropy alloy and its microstructure evolution[J]. Rare Metal Materials and Engineering,2018,47(9):2743~2748.]
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  • 收稿日期:2016-10-11
  • 最后修改日期:2017-02-13
  • 錄用日期:2017-03-16
  • 在線發(fā)布日期: 2018-11-01
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