锆基非晶合金离散磨粒冲蚀机理研究

doi:10.3901/JME.2022.15.092

摘要/Abstract

摘要： 磨料水射流作为一种冷态加工技术，在非晶合金零件加工中有巨大应用潜力。为揭示磨料水射流加工非晶合金的材料去除机理，基于单颗粒棕刚玉和玻璃珠磨料的冲击试验，探讨了冲击速度和冲击角度对非晶合金去除过程和去除形式的影响；量化分析了冲击参数对去除效率的影响规律。结果表明，非晶合金在磨粒冲击下的响应形式表现为弹性变形、剪切滑移、黏性流动、剪切裂纹和块状剥落，材料去除机理为塑性去除和脆性去除并存；磨粒冲击行为主要为反弹、破碎和嵌入，其中反弹是主要的冲击行为；去除量随着磨粒冲击速度的增加而增加，棕刚玉磨料比玻璃珠磨料具有更高的材料去除能力，且在45°冲击角时去除效率最高。研究结果不仅有利于理解玻璃态金属的冲蚀机理，还为以后研究磨料水射流加工非晶合金奠定了基础。

关键词: 非晶合金, 磨料水射流加工, 单颗粒冲击, 冲蚀机理

Abstract: As a cold material removal technology, abrasive waterjet machining has a good potential for the processing of Zr-based bulk metallic glass(BMG) materials.An experimental investigation of the material removal process is studied, and mechanisms of Zr-based BMG by individual brown fused alumina and glass bead abrasives under different impact velocities and angles are investigated.The effect of process parameters on the material removal rate is quantitatively discussed.The response of Zr-based BMG after impacted by abrasive particles mainly include elastic deformation, shear slip, viscous flow, shear cracks and bulk material removal, in which both plastic and brittle modes of material removal exist.The impact process mainly includes particle rebound, crushing and embedding, of which particle rebound is the main phenomenon.The amount of material removed per impact increases with the increase of abrasive impact speed.It is shown that brown fused alumina abrasives can remove more material than the glass beads, and the highest removal rate is found at the impact angle of about 450.The findings of this study provide a deep understanding of the erosion mechanisms of glassy metals and lay a foundation for future studies of abrasive waterjet machining of this type of materials.

Key words: Zr-based bulk metallic glass, abrasive water jet machining, single particle impact, material removal mechanism

中图分类号:

TG58
TH16

叶启立, 王成勇, 赖子健, 丁峰, 王军. 锆基非晶合金离散磨粒冲蚀机理研究[J]. 机械工程学报, 2022, 58(15): 92-104.

YE Qili, WANG Chengyong, LAI Zijian, DING Feng, WANG Jun. An Investigation into the Erosion Mechanisms of Zr-based Bulk Metallic Glasses by Loose Abrasives[J]. Journal of Mechanical Engineering, 2022, 58(15): 92-104.

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