Diffusion bonding of implantable Al2O3/Ti-13Nb-13Zr joints: Interfacial microstructure and mechanical properties
Diffusion bonding of implantable Al2O3/Ti-13Nb-13Zr joints: Interfacial microstructure and mechanical properties
复制标题
可植入 Al2O3/Ti-13Nb-13Zr 接头的扩散接合：界面微观结构和力学性能
DOI：
10.1016/j.matchar.2021.111665
复制
发表时间：
2022
影响因子：
4.7
通讯作者：
Niu Hongwei
中科院分区：
文献类型：
--
作者：
Bian Hong;Liu Yaqian;Song Xiaoguo;Long Weimin;Fu Wei;Chen Yue;Niu Hongwei
本研究采用扩散连接的方法制备了Al_2O_3/Ti-13Nb-13Zr(TNZ)合金可植入接头。研究了连接温度和保温时间对界面组织和力学性能的影响。采用扫描电子显微镜(SEM)、能谱仪(EDS)、透射电子显微镜(TEM)和X射线衍射仪(X射线衍射仪)对不同温度、不同保温时间的接头界面组织进行了表征。Al_2O_3/TnZ接头的典型组织为：Al_2O_3陶瓷/TiAl层+TiO_2+Nb_2O_5+Al_3Al_2/连续的Ti3Al层/针状Ti3Al+TiO_3(S，S)/TnZ母材。钛元素的存在主要促进了TNZ与Al_2O_3陶瓷的冶金结合。Nb与Al_2O_3陶瓷反应生成Nb_2O_5和AlNb_2相，在界面结合中起重要作用。随着连接温度的升高或保温时间的延长，TiAl层和Ti3Al层逐渐增厚，Nb2O5和AlNb2相的数量先增加后减少。这与这些节点的平均抗剪强度的变化相对应，平均抗剪强度先上升后下降。当连接温度为1175℃、时间为60min、压力为3 Mpa时，接头的平均剪切强度达到最大值52.0 Mpa，接头的断裂主要发生在氧化铝陶瓷上。
In this study, implantable Al2O3/Ti-13Nb-13Zr (TNZ) alloy joints were achieved by diffusion bonding. The effects of bonding temperature and holding time on interfacial microstructure and mechanical properties were investigated. The interfacial microstructures of the joints bonded at various temperatures and holding time were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The typical microstructure of the Al2O3/TNZ joint, which was obtained at 1175 °C for 60 min under a pressure of 3 MPa, was Al2O3ceramic/TiAl layer + TiO2+ Nb2O5+ AlNb2/continuous Ti3Al layer/acicular Ti3Al + Ti (s,s)/TNZ substrate. The presence of Ti element mainly contributed to the metallurgical bonding between TNZ and Al2O3ceramic. Nb reacted with Al2O3ceramic forming Nb2O5and AlNb2phases which played important roles in interfacial bonding. With the increase of bonding temperature or holding time, TiAl layer and Ti3Al layer thickened gradually while the number of Nb2O5and AlNb2first increased and then decreased. This corresponded to the change of average shear strength of these joints, which initially rose and then declined. The maximum of average shear strength reached 52.0 MPa when joints bonded at 1175 °C for 60 min under a pressure of 3 MPa, and the bonded joints mainly fractured at Al2O3ceramic.