Oxidation Behavior of High Entropy Mo25Nb25Ta25W25 Alloy

Wang Kang; Chen Yuhong; Wang Hongye; Bai Zhangjun; Liu Chuanghong; Wu Lan’er

doi:10.15980/j.tzzz.2018.06.023

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Oxidation Behavior of High Entropy Mo₂₅Nb₂₅Ta₂₅W₂₅ Alloy
Vol. 38, Issue 6, Pages: 661-665(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.06.023

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[1]王康,陈宇红,王鸿业,白掌军,刘创红,吴澜尔.高熵合金Mo_(25)Nb_(25)Ta_(25)W_(25)的氧化行为[J].特种铸造及有色合金,2018,38(06):661-665.

Wang Kang, Chen Yuhong, Wang Hongye, et al. Oxidation Behavior of High Entropy Mo₂₅Nb₂₅Ta₂₅W₂₅ Alloy. [J]. Special Casting & Nonferrous Alloys 38(6):661-665(2018)
[1]王康,陈宇红,王鸿业,白掌军,刘创红,吴澜尔.高熵合金Mo_(25)Nb_(25)Ta_(25)W_(25)的氧化行为[J].特种铸造及有色合金,2018,38(06):661-665. DOI： 10.15980/j.tzzz.2018.06.023.

Wang Kang, Chen Yuhong, Wang Hongye, et al. Oxidation Behavior of High Entropy Mo₂₅Nb₂₅Ta₂₅W₂₅ Alloy. [J]. Special Casting & Nonferrous Alloys 38(6):661-665(2018) DOI： 10.15980/j.tzzz.2018.06.023.

摘要

探究氧化物层的破裂和钼的氧化物挥发在高熵合金Mo

的氧化动力学中的作用机理。通过热压烧结制备了具有简单BCC结构的Mo

高熵合金。分别研究其在800、900和1 000℃下的氧化动力学行为

并对其氧化机理进行了初步描述。通过XRD、SEM和电子探针对氧化物进行表征。结果表明

在整个氧化温度范围内

氧化层中主要氧化产物为Ta

和Nb

具有一定的保护性。试样在800℃下遵循抛物线规律

随试验温度升高

生成的MoO

挥发

氧化层变得疏松多孔

使合金在900℃的中期和1 000℃开始满足直线规律。

Abstract

The action mechanism of oxide layer crack and volatilization of molybdenum oxides in the oxidative kinetics of high entropy alloy Mo

was described.An equal mole ratio Mo

alloy with a simple BCC structure was prepared by hot-pressing sintering.The oxidation behavior of the high entorpy alloy were analyzed at 800℃、900℃and 1 000℃

respectively

and the oxidation mechanism was expounded.The oxides were characterized by XRD

SEM and electron probe X-ray microanalyzer（EPMA）.The results reveal that at oxidation temperature range

the main oxidation products are Ta

and Nb

with some protection in the oxide layer.The kinetics of the tested samples follows the parabolic law at 800℃

while follows the linear law at the middle of 900℃and1 000℃

which are attributed to the volatilization of MoO

leading to oxide layer loose and porous at higher temperature.