• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2025, Vol. 61 ›› Issue (13): 440-448.doi: 10.3901/JME.2025.13.440

• 制造工艺与装备 • 上一篇    

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基于选择性腐蚀的难熔高熵合金电火花线切割加工材料蚀除机制研究

张竟赛, 岳小康, 陈顺华   

  1. 合肥工业大学机械工程学院 合肥 230009
  • 收稿日期:2024-07-23 修回日期:2025-01-23 发布日期:2025-08-09
  • 作者简介:张竟赛,男,1997年出生,博士研究生。主要研究方向为领域交叉融合制造技术。E-mail:2020110141@mail.hfut.edu.cn;陈顺华(通信作者),男,1986年出生,博士,教授,博士研究生导师。主要研究方向为领域交叉融合制造技术。E-mail:shchen@hfut.edu.cn
  • 基金资助:
    安徽省自然科学基金(2308085ME172)和合肥工业大学学术新人提升计划B(JZ2022HGTB0247)资助项目。

Study on the Material Erosion Mechanisms in WEDM of Refractory High Entropy Alloys via Selective Corrosion

ZHANG Jingsai, YUE Xiaokang, CHEN Shunhua   

  1. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009
  • Received:2024-07-23 Revised:2025-01-23 Published:2025-08-09

摘要: 难熔高熵合金(Refractory high entropy alloy, RHEA)通常存在着复杂多变的微观结构、组成相以及严重的元素偏析,使得其电火花线切割加工过程中的材料蚀除机制难以明晰。由于合金组成相之间的元素富集差异以及加工表面存在多孔结构的重铸层,加工样品通常会发生选择性腐蚀。基于这一特性,对具有多相结构的W15(TaVZr)85 RHEA电火花线切割加工样品进行了不同时长的电化学腐蚀处理。通过对不同腐蚀时间后的表面形貌和不同深度处的元素原子分数及分布进行表征与分析,发现该合金在电火花线切割加工过程中基体中的V和Zr元素向重铸层发生了明显迁移。根据组成相与富集元素之间的对应关系以及组成相物理性能和晶体结构稳定性之间的差异性,揭示了电火花线切割加工过程中次要相倾向于被优先蚀除的材料蚀除机制。当前工作为金属材料电火花加工过程中的材料蚀除和重铸层形成机制等研究提供了一种潜在策略。

关键词: 难熔高熵合金, 电火花线切割加工, 材料蚀除机制, 电化学腐蚀

Abstract: Refractory high entropy alloys (RHEAs) usually exhibit complex and variable microstructures and constituent phases, as well as severe element segregation, making it difficult to clarify the material erosion mechanism during wire electrical discharge machining (WEDM). Due to the differences in element enrichment for constituent phases and the presence of porous recast layer on the machined surface, selective corrosion usually occurs on the machined samples. Based on this characteristic, different durations of electrochemical corrosion treatment are performed on the WEDMed W15(TaVZr)85 RHEA with multi-phase structure. The surface morphology with different corrosion time and the content and distribution of constituent elements at different depths beneath the machined surface are investigated and analyzed. The V and Zr elements are found to migrate significantly to the recast layer during WEDM. According to the correspondence between constituent phases and enriched elements, as well as the differences in physical properties and crystal structure stability of constituent phases, the material erosion mechanism in which minor phases tend to be preferentially eroded during WEDM is revealed. The present work provides a potential strategy for the mechanism investigations on the material erosion and recast layer formation for EDMed metallic materials.

Key words: refractory high entropy alloy, WEDM, material erosion mechanism, electrochemical corrosion

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