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机械工程学报

机械工程学报 ›› 2025, Vol. 61 ›› Issue (9): 78-88.doi: 10.3901/JME.2025.09.078

• 特邀专栏：高性能制造 • 上一篇    

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微织构形貌对TC4黏接表面结合强度的影响

弓展1,2, 康仁科1,2, 杨峰1,2, 董志刚1,2, 李坤1,2, 鲍岩1,2   

  1. 1. 大连理工大学机械工程学院 大连 116024;
    2. 大连理工大学高性能精密制造全国重点实验室 大连 116024
  • 收稿日期:2024-05-26 修回日期:2024-10-09 发布日期:2025-06-12
  • 通讯作者: 鲍岩,男,1987年出生,博士,教授,博士研究生导师。主要研究方向为难加工材料超声辅助加工理论与技术、弱刚度构件精密加工理论与技术。E-mail:baoy@dlut.edu.cn E-mail:baoy@dlut.edu.cn
  • 作者简介:弓展,男,1997年出生。主要研究方向为热防护系统黏接技术。E-mail:272786412@qq.com
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(DUT22LAB501)。

Effect of Micro-texture Morphologies on Interfacial Bonding Strength of TC4 Alloy

GONG Zhan1,2, KANG Renke1,2, YANG Feng1,2, DONG Zhigang1,2, LI Kun1,2, BAO Yan1,2   

  1. 1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024;
    2. State Key Laboratory of High-performance Precision Manufacturing, Dalian University of Technology, Dalian 116024
  • Received:2024-05-26 Revised:2024-10-09 Published:2025-06-12

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摘要： 黏接技术在航天领域的构件连接中得到了广泛应用，而利用表面处理技术可以有效增强界面结合强度，在各种表面处理技术中，激光表面处理技术具有灵活、高效等优点受到了广泛关注。使用纳秒激光在TC4合金表面加工90°、0°凹槽、圆阵列、蜂窝及网状五种不同形貌的织构，分析了不同深度、宽度的织构形貌对TC4界面结合强度的影响规律，建立织构形貌与剪切强度的映射关系，深入探讨了不同织构形貌的失效机理。结果表明：适宜深度的微织构使黏接界面形成了强力的机械互锁胶钉结构，当深度为10 μm时，90°凹槽剪切强度相比未织构表面提高了8.7%；随着宽度的增加接触面积增大，黏合剂与基体表面的互锁结构增多、表面能增大，有利于形成良好的界面结合形貌，当宽度为800 μm时，剪切强度提高了18.2%；不同织构形状有利于降低界面应力集中，使裂纹发生偏转，抑制裂纹传播，其中网状、蜂窝、圆阵列、0°凹槽剪切强度分别提高了20.7%、16.3%、14%、5.6%。以上研究明确了TC4表面织构形貌对黏接强度的增强机制及影响规律，为提高TC4在航空航天领域的实际应用提供了工艺指导和理论基础。

关键词: 激光微织构, 织构形貌, 界面结合强度, 断裂失效形式, 机械互锁

Abstract: Bonding technology has been widely used in the connection of components in the aerospace field, and the use of surface treatment technology can effectively enhance the interface bonding strength. Among various surface treatment technologies, laser surface treatment technology has been widely concerned because of its flexibility and high efficiency. In this paper, five different textures of 90 °, 0 ° groove, circular array, honeycomb and mesh are processed on the surface of TC4 alloy by nanosecond laser. The influence of texture morphology with different depth and width on the bonding strength of TC4 interface is analyzed. The mapping relationship between texture morphology and shear strength is established, and the failure mechanism of different texture morphology is discussed. The results show that the micro-texture with appropriate depth makes the bonding interface form a strong mechanical interlocking nail structure. When the depth is 10 μm, the shear strength of the 90 ° groove is 8.7% higher than that of the untextured surface. With the increase of the width, the contact area increases, the interlocking structure between the binder and the substrate surface increases, and the surface energy increases, which is conducive to the formation of a good interface bonding morphology. When the width is 800 μm, the shear strength is increased by 18.2%. The different texture shapes are beneficial to reduce the interface stress concentration, deflect the crack and inhibit the crack propagation. The shear strength of mesh, honeycomb, circular array and 0° groove is increased by 20.7%, 16.3%, 14% and 5.6%, respectively. The above studies have clarified the enhancement mechanism and influence law of TC4 surface texture morphology on bonding strength, which provides process guidance and theoretical basis for improving the practical application of TC4 in aerospace field.

Key words: laser micro-texture, texture morphology, interfacial bonding strength, fracture failure, mechanical interlock

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