难熔高熵合金NbMoTaWTi/Zr的高温氧化行为
High temperature oxidation behavior of refractory high entropy alloys NbMoTaWTi/Zr
查看参考文献16篇
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文摘
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采用真空电弧熔炼法制备NbMoTaWTi和NbMoTaWZr难熔高熵合金,分析合金组织结构与元素分布,研究两种合金从室温到1500℃的动态氧化行为以及1200℃的恒温氧化行为。结果表明:NbMoTaWTi合金主要由单一BCC固溶体相组成,而NbMoTaWZr合金则由BCC固溶体和富Zr相两相组成。两种合金在700℃以上温度均发生了剧烈的氧化反应。相比较而言,NbMoTaWTi合金在1300℃以下的抗氧化能力优于NbMoTaWZr合金。两种合金在1200℃恒温氧化时都以氧向内扩散为主,氧化3h后均发生了严重氧化。Ti和Zr的添加均未发生选择性氧化现象,虽然与其他难熔金属氧化物形成复合氧化物层,但其致密度不够,阻止氧化能力不足。 |
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其他语种文摘
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Refractory high entropy alloys NbMoTaWTi and NbMoTaWZr were prepared by vacuum arc melting.The microstructure and component distribution characteristics were analyzed,and the dynamic behavior during room temperature to 1500℃,as well as the isothermal oxidation behavior at 1200℃ were studied.Results reveal that NbMoTaWTi mainly consists of single body-centred cubic (BCC)phase,and NbMoTaWZr is composed of BCC and Zr-rich phases.These two alloys are both seriously oxidized above 700 ℃.Comparatively,NbMoTaWTi alloy is superior to NbMoTaWZr in antioxidation below 1300℃.For both two alloys,the oxygen diffusion inward mainly occurs during isothermal oxidation at 1200 ℃ and catastrophic oxidation takes place after 3h.The Ti and Zr addition cannot cause selective oxidation.Although these two elements form a composite oxide layer with other refractory metal oxides,the density and the ability to prevent oxidation is not enough. |
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来源
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材料工程
,2021,49(12):100-106 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2020.000917
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关键词
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难熔高熵合金
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组织结构
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高温氧化行为
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氧化产物
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地址
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1.
军事科学院国防科技创新研究院, 北京, 100071
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(徐州)中国矿业大学材料与物理学院, 江苏, 徐州, 221116
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家重点研发计划项目
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文献收藏号
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CSCD:7137467
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