Superior strength-ductility synergy in novel as-cast L12-type HEI Ni50Co25Cr9.5Al9Ti5Ta1.5 with hierarchical core-shell structure

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-02-06 DOI:10.1016/j.actamat.2025.120811

Junqi Liu, Xiaopeng Wang, Xiao Zong, Xianfei Ding, Hui Xu, Fei Yang, Fantao Kong

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引用次数: 0

Abstract

The development of high-entropy intermetallic (HEI) with core-shell structure is promising for solving strength-ductility dilemma. Here, we successfully impart stable dual-scale L1₂-type ordered core into as-cast HEI, promoting a novel L1₂-type HEI Ni₅₀Co₂₅Cr_9.5Al₉Ti₅Ta_1.5 with hierarchical core-shell structure. The locally compositional segregation induced hierarchical core-shell structure contributes to an excellent strength-ductility synergy with yield strength, ultimate tensile strength and uniform elongation of ∼1000 MPa, ∼1250 MPa and ∼12%, respectively. Our study reveals that the outstanding strength is attributed to significant micro-level precipitation strengthening and additional multi-level hetero-deformation induced (HDI) strengthening. Besides, the considerable ductility is ascribed to active dislocation movement and remarkable strain hardening capability. Moreover, micro-level SFs dominated deformation mechanism and macro-level fracture mechanism are also carefully investigated. The purpose of this work is not only to improve mechanical properties of as-cast L1₂-type HEI, but more importantly to correlate hierarchical core-shell structure with mechanical properties, deformation behavior and fracture mechanism, so as to shed light on a new direction for exploring novel advanced as-cast structural materials.

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.