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,Physical Review Materials

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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
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-08-26 , DOI: 10.1103/physrevmaterials.5.085007
Koji Inoue ₁ , Shuhei Yoshida ₂ , Nobuhiro Tsuji ₂

Affiliation

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.

中文翻译：

原子探针断层扫描直接观察 CoCrNi 中熵合金几纳米范围内的局部化学有序性及其对力学性能的影响

通过使用原子探针断层扫描直接观察 CoCrNi 中熵合金 (MEA) 中的局部化学排序。发现沿[111]方向的Cr、Co和Ni的密度几乎相同，而沿[001]方向的密度被调制为在大约10个原子层内交替出现略微增强和耗尽的值，对应于约 2 纳米。Co和Ni的调制度强于Cr。这表明，在面心立方 CoCrNi 固溶体合金中，富含 Cr 的 {001} 原子层和富含 (Ni + Co) 的 {001} 层倾向于相互对齐。发现 MEA 的机械性能不受局部化学排序的影响。

更新日期：2021-08-26

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