Specific very high cycle fatigue fracture mechanism in C17200 beryllium copper alloy caused by grain boundary precipitates and persistent slip bands

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2025-04-11 DOI:10.1016/j.engfracmech.2025.111113

Hongchang Ma , Zhinian Li , Junhuan Wang , Wei Hua , Guoqiang Gao , Hongqian Xue

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Abstract

The damage behavior of C17200 beryllium copper alloy during very high cycle fatigue (VHCF) at a loading frequency of 20 kHz was investigated. Samples subjected to varying loading were characterized and evaluated to clarify the impact of internal microstructure on VHCF performance. The findings demonstrate that grain boundary precipitates (GBPs) significantly influence the VHCF fracture behavior of the C17200 alloy. GBPs facilitate a change in fracture mode from the crack initiation phase to the crack propagation phase. The interaction between GBPs-persistent slip bands (PSBs) created a distinctive phenomenon in the crack initiation phase, wherein cracks originate from the GBPs and propagate along the PSBs. Furthermore, it was verified that areas with a high density of precipitates lead to their detachment. This study introduces the inaugural examination of the VHCF performance and fracture process of C17200 alloy. A novel fatigue life prediction model, which integrates the impact of precipitates as a critical factor, was established, demonstrating strong concordance with experimental results.

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晶界析出物和持续滑移带导致的 C17200 铍铜合金特定超高循环疲劳断裂机制

研究了加载频率为 20 kHz 的 C17200 铍铜合金在极高循环疲劳（VHCF）过程中的损伤行为。对承受不同加载的样品进行了表征和评估，以明确内部微观结构对 VHCF 性能的影响。研究结果表明，晶界析出物（GBPs）对 C17200 合金的 VHCF 断裂行为有显著影响。GBPs 促使断裂模式从裂纹起始阶段转变为裂纹扩展阶段。GBPs 与持久滑移带（PSBs）之间的相互作用在裂纹起始阶段产生了一种独特的现象，即裂纹从 GBPs 开始并沿着 PSBs 扩展。此外，研究还验证了析出物密度高的区域会导致析出物脱落。本研究首次对 C17200 合金的 VHCF 性能和断裂过程进行了研究。研究建立了一个新的疲劳寿命预测模型，该模型将析出物的影响作为一个关键因素，与实验结果非常吻合。

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.