Zr和Cu元素对钎焊TC4蜂窝微观组织与力学性能的影响

郭琛骏; 孙逸翔; 裴夤崟; 秦建; 李文彬; 马运五

doi:10.3969/j.issn.1674-6457.2025.06.003

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (6) : 26-35. DOI: 10.3969/j.issn.1674-6457.2025.06.003

精密钎焊

Zr和Cu元素对钎焊TC4蜂窝微观组织与力学性能的影响

郭琛骏¹, 孙逸翔^1*, 裴夤崟¹, 秦建¹, 李文彬¹, 马运五²

作者信息 +

Effect of Zr and Cu Elements on the Microstructure and Mechanical Properties of Brazed TC4 Honeycombs

GUO Chenjun¹, SUN Yixiang^1*, PEI Yinyin¹, QIN Jian¹, LI Wenbin¹, MA Yunwu²

Author information +

文章历史 +

摘要

目的研究Cu、Zr含量对Ti-Zr-Cu-Ni钎料钎焊TC4蜂窝组织及性能的影响。方法通过SEM、XRD和力学试验机等表征手段,发现钎焊接头主要由α-Ti+β-Ti及(Ti,Zr)₂(Cu,Ni)等金属间化合物（IMCs）组成。随着Cu、Zr含量的增加,钎料对母材的溶蚀加剧,其中高Cu钎料容易在母材与钎缝区域的连接表面发生偏析产生Ti₂Cu等金属间化合物,而高Zr钎料则易在整个钎缝及钎角区域产生Zr₂Ni, Zr₂Cu等IMCs,从而影响接头的力学性能。结果 Zr比Cu更易扩散至母材形成IMCs,通过调控Cu、Zr含量,可优化IMCs的形成,从而提升接头力学性能。力学测试结果显示,富Cu钎料的最大拉脱强度为22.0 MPa,富Zr钎料的最大抗剪切强度为6.9 MPa。结论富Cu钎料易生成Ti₂Cu,富Zr钎料易生成Zr₂Ni、Zr₂Cu等金属间化合物。这些金属间化合物降低了焊后残余应力并阻碍了裂纹扩展,从而提高了钎焊接头的力学性能。

Abstract

The work aims to study the effect of Cu and Zr contents on the microstructure and properties of TC4 honeycombs brazed by Ti-Zr-Cu-Ni brazing filler metal. Through characterization techniques such as SEM, XRD, and mechanical testing, it was found that the brazed joints primarily consisted of α-Ti + β-Ti and intermetallic compounds (IMCs) such as (Ti,Zr)₂(Cu,Ni). With the increase in Cu and Zr contents, the erosion of the base material by the filler metal intensified. High-Cu filler metals tended to segregate and form IMCs such as Ti₂Cu at the interface between the base material and the brazing seam, while high-Zr filler metals were prone to forming IMCs such as Zr₂Ni and Zr₂Cu throughout the brazing seam and fillet regions, thereby affecting the mechanical properties of the joints. Zr diffused more readily into the base material than Cu, forming IMCs. By adjusting the Cu and Zr contents, the formation of IMCs could be optimized, thereby enhancing the mechanical properties of the joints. Mechanical testing results showed that the maximum pull-off strength of Cu-rich filler metals was 22.0 MPa, while the maximum shear strength of Zr-rich filler metals was 6.9 MPa. This is attributed to the tendency of Cu-rich filler metals to form Ti₂Cu and Zr-rich filler metals to form Zr₂Ni and Zr₂Cu. These IMCs alleviate post-welding residual stress and hinder crack propagation, thereby improving the mechanical properties of the brazed joints.

导出引用

郭琛骏, 孙逸翔, 裴夤崟, 秦建, 李文彬, 马运五. Zr和Cu元素对钎焊TC4蜂窝微观组织与力学性能的影响[J]. 精密成形工程. 2025, 17(6): 26-35 https://doi.org/10.3969/j.issn.1674-6457.2025.06.003

GUO Chenjun, SUN Yixiang, PEI Yinyin, QIN Jian, LI Wenbin, MA Yunwu. Effect of Zr and Cu Elements on the Microstructure and Mechanical Properties of Brazed TC4 Honeycombs[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 26-35 https://doi.org/10.3969/j.issn.1674-6457.2025.06.003

中图分类号： TG425

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