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Ti_(2)Cu,富Zr钎料易生成Zr_(2)Ni、Zr_(2)Cu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。
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 ofα-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 Zr_(2)Ni and Zr_(2)Cu 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 Ti_(2)Cu and Zr-rich filler metals to form Zr_(2)Ni and Zr_(2)Cu.These IMCs alleviate post-welding residual stress and hinder crack propagation,thereby improving the mechanical properties of the brazed joints.
作者
郭琛骏
孙逸翔
裴夤崟
秦建
李文彬
马运五
GUO Chenjun;SUN Yixiang;PEI Yinyin;QIN Jian;LI Wenbin;MA Yunwu(State Key Laboratory of High Performance&Advanced Welding Materials,China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《精密成形工程》
北大核心
2025年第6期26-35,共10页
Journal of Netshape Forming Engineering
基金
国家重点研发计划(2022YFB3402203)
河南省重点研发项目(221111520100,241111233300)。
