Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints,Advanced Engineering Materials

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Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-12-30 , DOI: 10.1002/adem.202001237
Xinjian Ma ₁ , Yangwu Mao ₁ , Yu Duan ₁ , Quanrong Deng ₁ , Geming Wang ₁ , Shenggao Wang ₁

Affiliation

Graphite/Ti6Al4V (TC4) joining has been conducted with Cu–Ti–Ni filler and refractory metal (Nb or Ta) interlayer. Microstructural characterizations reveal that defect‐free interfaces are obtained among the refractory metal interlayer, fillers, and substrates, suggesting favorable interfacial bonding in the joints. The diffusion and dissolution of Nb or Ta atoms into the molten fillers occur during joining, leading to the formation of (Ti, R) solid solution ([Ti, R]ss, R = Nb, or Ta) in the filler layers and thickness decrease in the interlayer. Two filler layers adjacent to the interlayer primarily consist of Ti–Cu, Ti–Cu–Ni intermetallics, and (Ti, R)ss. A Ti‐rich diffusion layer and a thin TiC‐containing layer exist near TC4 and graphite substrates, respectively. The joints brazed with Nb and Ta interlayers exhibit shear strength of 2 1.0 ± 2.7 MPa and 20.2 ± 3.1 MPa, respectively, both higher than those without interlayer, implying that the introduction of refractory metal interlayer may benefit the joint stress relaxation by its intermediate coefficient of thermal expansion and high ductility. The joint strength with Nb interlayer is slightly higher than that with Ta interlayer, mainly attributed to the relatively lower elastic modules and yield strength of Nb.

中文翻译：

Nb或Ta夹层对石墨/ Ti6Al4V合金接头组织和力学性能的影响

石墨/ Ti6Al4V（TC4）连接已使用Cu-Ti-Ni填料和难熔金属（Nb或Ta）夹层进行。显微组织表征表明，在耐火金属中间层，填料和基材之间获得了无缺陷的界面，表明在接头中存在良好的界面结合。在连接过程中会发生Nb或Ta原子扩散和溶解到熔融填料中的情况，从而导致在填料层和厚度中形成（Ti，R）固溶体（[Ti，R] ss，R = Nb或Ta）中间层减少。与中间层相邻的两个填充层主要由Ti-Cu，Ti-Cu-Ni金属间化合物和（Ti，R）ss组成。TC4和石墨基底附近分别存在一个富含Ti的扩散层和一个含TiC的薄层。钎焊有Nb和Ta中间层的接头的剪切强度为2 1.0±2。分别比无夹层的高7 MPa和20.2±3.1 MPa，这表明引入难熔金属夹层可能会因其中间的热膨胀系数和高延展性而有益于接头应力松弛。Nb夹层的结合强度略高于Ta夹层，这主要归因于Nb的弹性模量和屈服强度相对较低。

更新日期：2020-12-30

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