Obtaining a strong and ductile Co-rich high entropy alloy via synergistic effect of pre-twinning and nanolamellar L12 precipitates

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-04-04 DOI:10.1016/j.scriptamat.2025.116685

Shangshu Wu , Yi Liu , Junbo Ding , Jiaxing Song , Quanwei Tian , Si Lan , Meng Wang , Yingqi Fan , Rong Huang , Shanyue Liang , Jin Tian , Zhen Chen , Ruoyu Liu , Jialin Chen , Xingwang Cheng

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Abstract

Alloys with high strength and competent ductility are highly demanded for modern engineering applications but difficult to design and prepare. In this study, we design a Co-rich Co₃₅Cr₂₀Fe₂₀Ni₂₀Al₂Ti₃ HEA that exhibits excellent tensile properties, facilitated by unique microstructures, namely pre-twins and nanolamellar L1₂ precipitates, which are introduced via multistep deformation and annealing. Comprehensive microstructural characterization, carried out through electron back scattering diffraction and transmission electron microscopy, demonstrates that interactions among lattice dislocations, pre-twins and nanolamellar L1₂ precipitates raise the dislocations slip stress barrier and dislocation storage rate, gifting the HEA a high strength and ductility mechanical properties. The present study provides insight into the fabrication of ultra-strong and ductile HEAs by tuning the substructures.

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通过预孪晶和纳米层状L12析出相的协同作用，获得了一种强韧的富钴高熵合金

具有高强度和良好延展性的合金是现代工程应用的要求，但设计和制备难度大。在本研究中，我们设计了一种富含co的Co35Cr20Fe20Ni20Al2Ti3 HEA，通过多步变形和退火引入了独特的微观结构，即预孪晶和纳米层状L12沉淀，从而具有优异的拉伸性能。通过电子背散射衍射和透射电镜进行的综合微观结构表征表明，晶格位错、预孪晶和纳米层状L12相的相互作用提高了位错滑移应力垒和位错储存率，使HEA具有高强度和延展性的力学性能。本研究为通过调整子结构来制造超高强度和延展性HEAs提供了新的思路。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.