Structure and hardness of in situ synthesized nano-oxide strengthened CoCrFeNi high entropy alloy thin films
Structure and hardness of in situ synthesized nano-oxide strengthened CoCrFeNi high entropy alloy thin films
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DOI：
10.1016/j.scriptamat.2021.114044
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发表时间：
2021-02
影响因子：
6
通讯作者：
Subin Lee;D. Chatain;C. Liebscher;G. Dehm
中科院分区：
文献类型：
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作者：
Subin Lee;D. Chatain;C. Liebscher;G. Dehm
在这项研究中，我们报告的面心立方结构的CoCrFeNi高熵合金薄膜与细分散的纳米氧化物颗粒，这是由内氧化形成的。扫描透射电子显微镜成像分析发现，颗粒为Cr2O3.通过Orowan型强化机制，氧化物颗粒有助于膜的硬化，与没有沉淀物的膜相比，膜的硬度增加14%。我们的新方法为利用氧化物相设计具有高强度的中高熵合金铺平了道路。
In this study, we report on face-centered cubic structured CoCrFeNi high-entropy alloy thin films with finely dispersed nano-oxide particles which are formed by internal oxidation. Analytical scanning transmission electron microscopy imaging found that the particles are Cr 2 O 3. The oxide particles contribute to the hardening of the film increasing its hardness by 14% compared to that of the film without precipitates, through the Orowan-type strengthening mechanism. Our novel approach paves the way to design medium-and high-entropy alloys with high strength by making use of oxide phases.