Enhancing fatigue resistance of high-entropy alloy by designing a hierarchically heterogeneous microstructure

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiaodi Wang , Wenliang Bai , Zhe Zhang , Zhengbin Wang , Xuechong Ren
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引用次数: 0

Abstract

Fatigue property is an important index for novel high-entropy alloys (HEAs) before their engineering applications. Here we engineer a Al0·3CoCrFeNi HEA with hierarchically heterogeneous microstructure by cold rolling and annealing treatment, which includes heterogeneous grains, annealing and deformation twins, residual dislocations and B2 precipitates with different morphologies, sizes and distributions. Stress-life (S–N) tests and characterization techniques including scanning electron microscope (SEM) and transmission electron microscope (TEM) were carried out to investigate fatigue properties as well as corresponding mechanisms. It is found that this HEA possesses good strength-ductility combination (i.e., yield strength of ∼870 MPa, ultimate tensile strength of ∼1060 MPa and ductility of ∼26 %) and fatigue resistance with fatigue ratio of ∼0.46 under stress ratio of −1. This fatigue ratio exceeds those of most reported HEAs. High strength renders the fatigue deformation mainly occurs in deformation twin regions decorated with B2 precipitates. Surface damage morphologies indicate that fatigue cracks initiate from persistent slip band-like shear bands. In addition, microstructural hierarchy results in the deflected fatigue crack propagation path, which is beneficial for the enhancement of fatigue resistance. Present results offer the guidance on future design for high fatigue-resistant HEAs by manipulating heterogeneous microstructure.

通过设计分层异质微结构增强高熵合金的抗疲劳性
疲劳性能是新型高熵合金(HEA)工程应用前的一项重要指标。在这里,我们通过冷轧和退火处理,设计了一种具有分层异质微观结构的 Al0-3CoCrFeNi HEA,其中包括异质晶粒、退火和变形孪晶、残余位错以及具有不同形态、尺寸和分布的 B2 沉淀。通过应力-寿命(S-N)测试以及包括扫描电子显微镜(SEM)和透射电子显微镜(TEM)在内的表征技术来研究其疲劳性能以及相应的机理。研究发现,这种 HEA 具有良好的强度-韧性组合(即屈服强度 ∼ 870 兆帕、极限抗拉强度 ∼ 1060 兆帕、韧性 ∼ 26 %)和抗疲劳性,在应力比为 -1 的情况下,疲劳比为 ∼ 0.46。这一疲劳比超过了大多数已报道的 HEA。高强度使得疲劳变形主要发生在装饰有 B2 沉淀的变形孪晶区域。表面损伤形态表明,疲劳裂纹是从持续的滑移带状剪切带开始的。此外,微观结构分级导致疲劳裂纹传播路径偏转,有利于提高抗疲劳性能。目前的研究结果为今后通过操纵异质微观结构设计高抗疲劳性 HEA 提供了指导。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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