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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of nitrogen alloying and friction stir processing on the microstructures and mechanical properties of CoCrFeMnNi high-entropy alloys
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Effects of nitrogen alloying and friction stir processing on the microstructures and mechanical properties of CoCrFeMnNi high-entropy alloys

机译：氮合金化和摩擦搅拌加工对COCRFEMNNI高熵合金的微观结构和力学性能的影响

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摘要

Equiatomic CoCrFeMnNi high-entropy alloys (HEAs) with and without nitrogen alloying were produced by vacuum induction melting and then subjected to friction stir processing. The effects of nitrogen alloying and friction stir processing on the microstructures and mechanical properties of these alloys were systematically investigated. The results suggested that nitrogen alloying effectively increases the yield strength and ultimate tensile strength of CoCrFeMnNi HEAs in the as-cast condition. Friction stir processing considerably broke down the coarse dendritic structures of the as-cast HEAs and caused grain refinement and composition homogenization. More significantly, nitrogen alloying promoted grain refinement by increasing the nucleation rate and retarding grain growth during dynamic recrystallization over the course of friction stir processing. The yield strength, ultimate tensile strength, and uniform elongation of CoCrFeMnNi HEAs treated by nitrogen alloying and friction stir processing reached 493 MPa, 832 MPa, and 32.6%, respectively. These improvements could be attributed to solid solution strengthening through nitrogen alloying and grain boundary strengthening by friction stir processing. This study provides an alternative technical route to enhance the mechanical properties of CoCrFeMnNi HEAs. (C) 2019 Elsevier B.V. All rights reserved.
机译：通过真空感应熔化产生具有和不具有氮合金化的高熵合金（HEAS），然后进行摩擦搅拌加工。系统研究了氮合金化和摩擦搅拌加工对这些合金的微观结构和力学性能的影响。结果表明，氮合金化有效地提高了COCRFEMNNI HEAS在铸造条件下的屈服强度和最终拉伸强度。摩擦搅拌加工显着突破了AS-铸件的粗树枝状结构并引起晶粒细化和组成均质化。更显着，通过增加摩擦搅拌加工过程中的动态再结晶期间的成核速率和延缓晶粒生长，氮合金化促进晶粒细化。通过氮合金化和摩擦搅拌加工处理的COCRFEMNNI HEAS的屈服强度，极限拉伸强度和均匀伸长率分别达到493MPa，832MPa和32.6％。这些改进可归因于通过摩擦搅拌加工通过氮合金化和晶界强化强化的固溶体。本研究提供了替代技术途径，以增强COCRFEMNNI HEAS的机械性能。 （c）2019 Elsevier B.v.保留所有权利。

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