原子探针层析成像直接观察CoCrNi中熵合金在几个纳米范围内的局部化学有序及其对力学性能的影响

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physical Review Materials Pub Date : 2021-08-26 DOI:10.1103/physrevmaterials.5.085007

K. Inoue, S. Yoshida, N. Tsuji

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引用次数: 20

摘要

利用原子探针层析成像直接观察了CoCrNi中熵合金(MEA)的局部化学有序。结果表明，Cr、Co和Ni在[111]方向上的密度基本一致，而在[001]方向上的密度在约10个原子层(约2 nm)内被调制为略微增强和减弱的交替值。Co和Ni的调制程度强于Cr，表明在面心立方CoCrNi固溶体合金中富Cr{001}原子层和富(Ni + Co){001}原子层倾向于相互排列。发现MEA的机械性能不受当地化学排序的影响。

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Direct observation of local chemical ordering in a few nanometer range in CoCrNi medium-entropy alloy by atom probe tomography and its impact on mechanical properties

Local chemical ordering in CoCrNi medium-entropy alloy (MEA) was directly observed by the use of atom probe tomography. It was found that the densities of Cr, Co, and Ni were almost the same along the [111] direction, while those along the [001] direction were modulated to take a slightly enhanced and depleted value alternately within approximately 10 atomic layers corresponding to about 2 nm. The degree of modulation of Co and Ni was stronger than that of Cr. It was suggested that Cr-rich {001} atomic layers and (Ni + Co)-rich {001} layers tended to align mutually in the face-centered-cubic CoCrNi solid solution alloy. The mechanical properties of the MEA was found not to be affected by the presence of the local chemical ordering.

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来源期刊

Physical Review Materials Physics and Astronomy-Physics and Astronomy (miscellaneous)

CiteScore

5.80

自引率

5.90%

发文量

611

期刊介绍： Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.