通过高熵合金中的异质层状结构设计增强强度和延展性的协同作用

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Longfei Zeng, Jinghui Zhang, Xu Lu, Shaoyu Li, Pingan Jiang
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引用次数: 0

摘要

异质层状结构(HLS)设计为通过异质协同效应提高高熵合金(HEAs)的机械性能提供了新的机遇。然而,由于高熵合金具有很强的加工硬化能力,因此通过剧烈塑性变形将 HLS 引入高熵合金仍具有挑战性。在本研究中,专门设计了一种多层次 HLS,其特点是交替堆叠微粒软 CoCrFeNi 层和纳米结构超硬 Al0.通过热压、冷轧和退火等传统热机械加工工艺,可控地将含有三相微结构(由纳米颗粒面心立方基体、富含(铝、镍)的 B2 沉淀和富含铬的σ 沉淀组成)的 3CoCrFeNi 层引入到催化裂化热氧化物中。同时,热机械加工促使铝元素在层界面上扩散,从而形成了界面过渡层,并在相邻的钴铬铁镍层和 Al0.3 钴铬铁镍层之间建立了牢固的界面结合。因此,多层次 HLSed CoCrFeNi/Al0.3CoCrFeNi 复合材料的屈服强度高达 1127±25.4 MPa,同时保持了较大的断裂伸长率(高达 (26.3±2.4)%)。这种优异的强度-电导率协同作用超过了之前报道的大多数通过化学成分优化和/或热机械加工制备的高性能整体块状钴铬铁镍和 Al0.3CoCrFeNi HEA。明显的微结构/微硬度差异和相邻钴铬铁镍层与 Al0.3CoCrFeNi 层之间的强界面结合,以及同时激活的多种应变硬化机制(包括机械孪晶、堆叠断层和沉淀强化)诱导了强烈的异质变形强化,这些都是实现出色的强度-电导率组合的原因。这种多层次 HLS 及其制造策略为开发强度高、韧性好的 HEA 提供了一种具有启发性的方法,也可应用于其他金属材料的高性能设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhancing strength and ductility synergy through heterogeneous laminated structure design in high-entropy alloys

Enhancing strength and ductility synergy through heterogeneous laminated structure design in high-entropy alloys
Heterogeneous laminated structure (HLS) design offers new opportunities to enhance the mechanical performance of high-entropy alloys (HEAs) through synergistic effects from heterogeneity. However, it remains challenging to introduce the HLS into HEAs via severe plastic deformation due to their strong work-hardening capacity. In this study, a specially designed multi-level HLS, characterized by alternatively stacked micro-grained soft CoCrFeNi layers and nanostructured ultra-hard Al0.3CoCrFeNi layers containing a three-phase microstructure (composed of nanograined face-centered cubic matrix, (Al, Ni)-rich B2 precipitates, and Cr-rich σ precipitates), is controllably introduced into FCC HEAs via a conventional thermo–mechanical processing involving hot-pressing, cold-rolling, and annealing. Meanwhile, thermo–mechanical processing induces Al element diffusion across the layer interface, resulting in the formation of an interfacial transition layer and the establishment of a strong interface bonding between the neighboring CoCrFeNi and Al0.3CoCrFeNi layers. As a result, the multi-level HLSed CoCrFeNi/Al0.3CoCrFeNi composite exhibits a yield strength as high as 1127±25.4 MPa while maintaining a large fracture elongation (up to (26.3±2.4)%). Such an excellent strength–ductility synergy surpasses that of most previously reported high-performance monolithic bulk CoCrFeNi and Al0.3CoCrFeNi HEAs prepared through careful chemical composition optimization and/or thermo–mechanical processing. Strong hetero-deformation induced strengthening benefited from the apparent microstructural/microhardness difference and the strong interface bonding between the neighbouring CoCrFeNi and Al0.3CoCrFeNi layers, together with simultaneous activation of multiple strain hardening mechanisms containing mechanical twinning, stacking faults and precipitation strengthening, is responsible for the excellent strength–ductility combination. This multi-level HLS and its fabrication strategy provide an enlightening way to develop strong and ductile HEAs and can also be applied to high-performance designs of other metallic materials.
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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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