Enhancement mechanism of fracture-resistance of CrMnFeCoNi high-entropy alloys: A molecular dynamics study
Enhancement mechanism of fracture-resistance of CrMnFeCoNi high-entropy alloys: A molecular dynamics study
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CrMnFeCoNi高熵合金抗断裂性能增强机制：分子动力学研究
DOI：
10.1016/j.apt.2022.103603
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发表时间：
2022-06
影响因子：
5.2
通讯作者：
Xianghe Peng
中科院分区：
文献类型：
--
作者：
Peiwen Liu;Henggao Xiang;Haitao Li;Xianghe Peng
研究发现，非晶化和位错的协同作用可以显著提高CrMnFeCoNi合金的抗回火性能。·在HEAs中，非晶结构和位错同时出现，非晶结构被周围的位错所限制。·通过非晶化转变可以缓解局部应力集中，从而获得额外的耐高温性能。·初始裂纹长度可以影响CrMnFeCoNi HEAs中的裂纹扩展。研究发现，高熵合金在剧烈塑性变形条件下会发生非晶化。因此，了解非晶化与其他种类的变形的相互作用已成为一个重要的问题，设计的HEAs的机械性能。然而，这种相互作用在HEAs的潜在机制仍然不清楚。在分子动力学模拟中，我们发现非晶化和位错的协同作用可以显著提高CrMnFeCoNi高性能铝合金的耐高温性能。结果表明，在HEAs中同时出现了非晶结构和位错，其中非晶结构受到周围位错的限制。当裂纹扩展时，部分位错区会发生非晶化，从而使局部应力集中得到缓解，从而提高了CrMnFeCoNi高性能热交换器的抗疲劳性能。相反，在镍单晶中，仅出现位错，并且当位错发射时更容易发生断裂。研究还发现，裂纹的长度可以影响HEAs中的微观结构的演变。这些发现提供了新的见解之间的协同效应的非晶化和位错的增强HEAs的耐腐蚀性，这可能有助于提高高性能HEAs的机械性能之间的相互作用。
• It is found that that the synergistic effects of amorphization and dislocations can significantly improve the fracture-resistance of CrMnFeCoNi HEAs. • The amorphous structures and dislocations appear simultaneously in HEAs, where the amorphous structures are confined by the surrounding dislocations. • The local stress concentration can be relaxed by amorphization transformation, resulting in extra fracture-resistance. • The initial crack length can affect the crack propagation of in CrMnFeCoNi HEAs. It has been found that amorphization in high-entropy alloys (HEAs) can happen under the condition of severe plastic deformation. Therefore, understanding the interaction of amorphization with other kinds of deformations has become an important issue for the design of the mechanical properties of HEAs. However, the underlying mechanism of such interaction in HEAs remains unclear. Here we found in our molecular dynamics simulations that the synergistic effects of amorphization and dislocations could significantly improve the fracture-resistance of CrMnFeCoNi HEAs. It shows that amorphous structures and dislocations appeared simultaneously in HEAs, where the amorphous structures are confined by the surrounding dislocations. Once a crack propagates, some dislocation zones would become amorphous, and the local stress concentration could be relaxed during such kind of transformation instead of crack propagation, resulting in the improvement of the fracture-resistance of CrMnFeCoNi HEAs. In contrast, in nickel single crystals, only dislocations appear and fracture is more likely to occur when dislocations are emitted. It was also found that the length of cracks could affect the evolution of the microstructures in the HEAs. These findings provide new insights into the synergistic effects of the interaction between amorphization and dislocations on the enhancement of the fracture-resistance of the HEAs, which may help to improve the mechanical properties of high-performance HEAs.
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影响因子：
9.4
作者：
I. Katzarov;A. Paxton
通讯作者：
I. Katzarov;A. Paxton
影响因子：
6.2
作者：
T. Teramoto;Kazuki Yamada;Ryo Ito;Katsushi Tanaka
通讯作者：
T. Teramoto;Kazuki Yamada;Ryo Ito;Katsushi Tanaka
影响因子：
24.2
作者：
Ye, Y. F.;Wang, Q.;Yang, Y.
通讯作者：
Yang, Y.
DOI：
10.1038/nature23472
发表时间：
2016-04
期刊：
--
影响因子：
--
作者：
L. Zepeda-Ruiz;A. Stukowski;T. Oppelstrup;V. Bulatov
通讯作者：
L. Zepeda-Ruiz;A. Stukowski;T. Oppelstrup;V. Bulatov
影响因子：
9.4
作者：
Kanani, M.;Hartmaier, A.;Janisch, R.
通讯作者：
Janisch, R.