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CrMoNbTiVx難熔高熵合金的組織特征及高溫抗氧化性能研究
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1.河南工業(yè)大學(xué) 機(jī)電工程學(xué)院;2.哈爾濱工業(yè)大學(xué) 金屬精密熱加工國家級重點(diǎn)實(shí)驗(yàn)室;3.華中科技大學(xué) 材料成形與模具技術(shù)國家重點(diǎn)實(shí)驗(yàn)室

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國家自然科學(xué)基金（52001114、51825401）、河南省高?？萍紕?chuàng)新人才支持計(jì)劃（23HASTIT022）、華中科技大學(xué)材料成形與模具技術(shù)國家重點(diǎn)實(shí)驗(yàn)室開放基金（P2023-005）、河南省高等學(xué)校青年骨干教師培育計(jì)劃（2021GGJS064）


Microstructure characteristics and oxidation properties at elevated temperature for CrMoNbTiVx refractory high entropy alloys
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1.School of Mechanic and Electrical Engineering,Henan University of Technology;2.National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology;3.State Key Laboratory of Materials Processing and Die Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology

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    摘要:

    本文制備了五種不同V含量的CrMoNbTiVx（x=0、0.2、0.4、0.6、0.8）難熔高熵合金，研究了合金的相組成、微觀組織特征及在800 ℃下的高溫抗氧化性能。結(jié)果表明：不同V含量CrMoNbTiVx合金在鑄態(tài)時(shí)均為單一體心立方結(jié)構(gòu)，形成了典型的枝晶狀組織。在800 ℃氧化20 h和100 h后，CrMoNbTi合金的氧化增重分別為0.25 mg/cm2和0.50 mg/cm2，CrMoNbTiV0.8合金的氧化增重分別為1.49 mg/cm2和3.36 mg/cm2。隨V含量的降低，CrMoNbTiVx合金的氧化增重越少，氧化層表面越平整。CrMoNbTiV0.8和CrMoNbTi合金氧化100 h后的表面高度差分別為24.80 μm和3.37 μm。V含量不同，合金的氧化產(chǎn)物也不相同，針狀V2Nb6O19氧化物顯著降低CrMoNbTiVx合金的抗氧化性能。V含量下降能促進(jìn)氧化層中形成TiO2 、CrVNbO6和Ti4Cr3Nb3O2致密氧化物，提高CrMoNbTiVx難熔高熵合金高溫抗氧化性能。隨V含量減少，CrMoNbTiVx合金氧化層中V2Nb6O19、CrVNbO6和V2O5含量均減少，不含V的CrMoNbTi合金氧化層由致密的TiO2和Ti4Cr3Nb3O2組成，合金的抗氧化性能明顯提高。

    Abstract:

    CrMoNbTiVx (x=0, 0.2, 0.4, 0.6, 0.8) refractory high entropy alloys with different addition of vanadium were prepared, and the phase constitution, microstructure characteristics and oxidation properties at elevated temperature were investigated. Results show that the as-cast CrMoNbTiVx alloys with different addition of vanadium exhibit single body-centered cubic (BCC) crystal and form dendrite structure. After oxidation at 800 ℃ for 20 h and 100 h, weight gains of CrMoNbTi alloy are 0.25 mg/cm2 and 0.50 mg/cm2, respectively, while weight gains of CrMoNbTiV0.8 alloy are 1.49 mg/cm2 and 3.36 mg/cm2, respectively. Weight gains of CrMoNbTiVx alloys are decreased with decreasing of vanadium, and the surface of oxidation layer gets smoother with decreasing of vanadium. Height differences of CrMoNbTiV0.8 and CrMoNbTi after oxidation for 100h are 24.80 μm and 3.37 μm, respectively. The oxidation products of alloys with different addition of vanadium are different, and the V2Nb6O19 needle shape oxidation products can obviously reduce the oxidation properties of CrMoNbTiVx alloys. Reducing the addition of vanadium can promote formation of compact oxidation products of TiO2, CrVNbO6 and Ti4Cr3Nb3O2, and therefore improve oxidation properties of CrMoNbTiVx alloys. V2Nb6O19, CrVNbO6 and V2O5 in oxidation layer of CrMoNbTiVx alloys are reduced with decreasing of vanadium. The oxidation layer of CrMoNbTi without addition of vanadium is consisted of compact TiO2 and Ti4Cr3Nb3O2, and therefore the oxidation resistance is significantly improved.

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徐琴,王琪,趙甲丁,殷亞軍,陳瑞潤. CrMoNbTiVx難熔高熵合金的組織特征及高溫抗氧化性能研究[J].稀有金屬材料與工程,2024,53(11):3194~3204.[Qin Xu, Qi Wang, Jiading Zhao, Yajun Yin, Ruirun Chen. Microstructure characteristics and oxidation properties at elevated temperature for CrMoNbTiVx refractory high entropy alloys[J]. Rare Metal Materials and Engineering,2024,53(11):3194~3204.]
DOI：10.12442/j. issn.1002-185X.20230581

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  • 收稿日期:2023-09-15
  • 最后修改日期:2024-03-02
  • 錄用日期:2024-03-11
  • 在線發(fā)布日期: 2024-11-20
  • 出版日期: 2024-11-08