Strengthening and ductilization effect of boron in L12-type high-entropy intermetallic compounds

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-07-30 DOI:10.1016/j.intermet.2025.108939

Qing Wang , Shiyu Xu , Wenwei Huang , Qiangqiang Cheng , Siyi Wu , Yuan Qin , Ming Huang

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引用次数: 0

Abstract

As a promising candidate for high-temperature structural materials, L1₂-type high-entropy intermetallic compound (HEIC) still encounters the problem of room-temperature brittleness. Microalloying with boron has been demonstrated to be an effective strategy for improving the ductility of HEICs. Nevertheless, the precise influence of boron on the microstructure and mechanical properties of HEICs remains unclear. To better understand the role of boron, a seires of Ni-Co-Fe-Cr-Al-Ti HEICs with varying boron concentrations (0.1–2.0 at.%) were systematically investigated. when the boron content is below 1.0 at.%, the HEIC exhibited a nearly single-phase L1₂ ordered structure. However, at higher boron concentrations, TiB₂ particles began to form at grain boundaries and interdendritic regions. Solute boron showed significant solid solution strengthening on the HEICs with a strengthening potency of approximately 270 MPa/at%. Appropriate boron doping effectively improved the ductility of L1₂-type HEICs by enhancing the grain boundary cohesion, with the highest ductility achieved at 0.5 at.% boron doping. The formation of TiB₂ particles had a negligible effect on yield strength, but adversely affected ductility. These findings deepen our understanding of the strengthening mechanisms in L1₂-type HEICs and provide valuable guidance for the design of novel HEICs.

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硼在l12型高熵金属间化合物中的强化和延展性作用

l12型高熵金属间化合物（high-entropy intermetal compound， HEIC）是一种很有前途的高温结构材料，但其室温脆性问题仍然存在。硼微合金化已被证明是提高heic延展性的有效策略。然而，硼对HEICs微观结构和力学性能的确切影响尚不清楚。为了更好地了解硼的作用，系统地研究了一系列不同硼浓度（0.1-2.0 at.%）的Ni-Co-Fe-Cr-Al-Ti heic。当硼含量低于1.0 at时。%时，HEIC呈现近单相L12有序结构。然而，在较高的硼浓度下，TiB2颗粒开始在晶界和枝晶间区域形成。溶质硼对heic具有明显的固溶体强化作用，强化效能约为270 MPa/at%。适当的硼掺杂通过增强晶界内聚性，有效地改善了l12型heic的延展性，在0.5 at处延展性最高。%硼掺杂。TiB2颗粒的形成对屈服强度的影响可以忽略不计，但对延展性有不利影响。这些发现加深了我们对l12型heic强化机制的理解，并为新型heic的设计提供了有价值的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.