微量Al促进了Ni2.1CoCrFeTa0.2高熵合金的双超晶格析出，具有优异的拉伸性能

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-21 DOI:10.1016/j.intermet.2025.108888

Rongtian Cao, Jianlin Lu, Zhongsheng Yang, Songyu Wang, Lei Wang, Junjie Li, Zhijun Wang, Jincheng Wang, Feng He

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引用次数: 0

摘要

L12和D022超晶格在高熵合金（HEA）中表现出良好的强化效果和热稳定性。将这两种析出相结合在一种合金中，可以提高合金的综合性能。然而，由于热时效过程中L12和D022相之间的相互作用尚未被探索，HEAs中双超晶格析出物的设计仍然具有挑战性。在这里，我们展示了添加最小的l12形成Al （0.5 at）。%)导致Ni2.1CoCrFeTa0.2中L12-D022双超晶格析出。我们的结果表明，随着Al的含量从0增加到只有1 at。%, Ni2.1CoCrFeTa0.2中主要析出相由单一的D022相变为L12-D022双相，最后变为单一的L12相。样品在650 ~ 750℃的不同温度下退火。当温度高于700℃时，D022相变得不稳定，双超晶格结构被破坏。通过700℃时效84 h，（Ni2.1CoCrFeTa0.2）99.5Al0.5 HEA合金获得了1550 MPa的抗拉强度和16%的断裂伸长率，为设计具有良好力学性能的析出硬化合金提供了指导。

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Minimal Al promotes dual-superlattice precipitates in Ni2.1CoCrFeTa0.2 high entropy alloy with excellent tensile properties

L1₂ and D0₂₂ superlattices have shown excellent strengthening effects and good thermal stability in high entropy alloys (HEA). Cooperating these two precipitates in one alloy has been proved promising in enhancing the comprehensive properties. However, design of the dual-superlattice precipitates in HEAs is still challenging due to unexplored interactions between the L1₂ and D0₂₂ phases during thermal aging. Here, we showed that addition of minimal L1₂-forming Al (0.5 at. %) led to L1₂-D0₂₂ dual superlattice precipitates in Ni_2.1CoCrFeTa_0.2. Our results showed that as the content of Al increases from 0 to only 1 at. %, the dominant precipitates in Ni_2.1CoCrFeTa_0.2 changed from single D0₂₂ phase to L1₂-D0₂₂ dual phases, and finally single L1₂ phase. Samples were annealed at different temperatures ranging from 650 °C to 750 °C. When the temperature is higher than 700 °C, D0₂₂ phase become unstable, the dual-superlattice structure will be disrupted. Superior tensile strength of 1550 MPa and good fracture elongation of 16 % are achieved by aging the (Ni_2.1CoCrFeTa_0.2)_99.5Al_0.5 HEA at 700 °C for 84 h. These insights provide guidance for the design of precipitation-hardened alloys with better mechanical properties.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.