This study investigates the microstructure and mechanical properties of Ti-6Al-4V brazed joints which has been performed in a vacuum furnace using BAg-22 (Ag–16Cu–23Zn–4.5Ni-7.5Mn, wt. %) as filler metal. The microstructure of the brazed joints has been analyzed by means of optical microscope, scanning electron microscope (SEM) and X-Ray diffraction (XRD). In addition, the mechanical strengths of the joints have been evaluated by shear test and microhardness test. Brazing temperatures employed in this study are 720, 750, and 780 °C for a holding time of 30 min. By increasing the brazing temperature, a variety of intermetallic phases have been formed in the bond area, such as CuTi, CuTi₂, Mn₂Ti, MnZn₂, AgZn and Ag solid solution. Both the brazing temperature and the brazing time seem have critical factors for controlling the microstructure and the better mechanical property of the brazed joints. The maximum shear strength of 154.15 MPa has been achieved at 780 °C and a holding time of 30 min.

中文翻译：

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Ti-6Al-4V低温钎料钎焊接头的组织和力学性能研究

这项研究调查了在真空炉中使用BAg-22（Ag-16Cu-23Zn-4.5Ni-7.5Mn，wt。％）作为填充金属在Ti-6Al-4V钎焊接头的组织和力学性能。通过光学显微镜，扫描电子显微镜（SEM）和X射线衍射（XRD）分析了钎焊接头的微观结构。另外，通过剪切试验和显微硬度试验评价了接头的机械强度。这项研究中采用的钎焊温度为720、750和780°C，保持时间为30分钟。通过提高钎焊温度，在结合区域形成了各种金属间相，例如CuTi，CuTi ₂，Mn ₂ Ti，MnZn ₂，AgZn和Ag固溶体。钎焊温度和钎焊时间似乎都是控制钎焊接头的微观结构和更好的机械性能的关键因素。在780°C和30分钟的保持时间下已达到154.15 MPa的最大剪切强度。