Ti6Al4V钛合金表面不同气压离子镀纯Mg薄膜的性能

为了进一步提高人体植入材料Ti6Al4V钛合金的生物功能,采用多弧离子在其表面沉积纯Mg薄膜。采用现代表面分析技术研究了不同气压下沉积的纯Mg薄膜的组织结构和降解特性。结果表明:当气压为10-3Pa时,Ti6Al4V钛合金表面覆盖有粒径为1～3μm的Mg颗粒且具备优异的结晶性能,纯Mg薄膜在Hank’s人体模拟液中浸泡1 d时,浸泡液的p H值从7.5快速升高至10.0,略小于纯Mg块体之p H值,之后p H值有一定程度的减小;在100Pa压力下沉积纯Mg薄膜时浸泡液的pH值降低速度比10-3Pa下时的慢,10-3Pa沉积的纯Mg薄膜浸泡液的p H值降低速度最快,具备更优的耐蚀性能; Mg2+的释放速率属于先快速后缓慢的变化过程。

Microstructure and mechanical properties of Ti6Al4V/Cu-10Sn bronze diffusion-bonded joint

The microstructures and mechanical properties of Ti6Al4V/Cu-10Sn bronze diffusion-bonded joint were studied via scanning electron microscopy(SEM)and energy dispersive spectrometry(EDS).Diffusion bonding of Ti6Al4V to Cu-10Sn bronze was investigated at different holding time.Four obvious interfacial layers were observed in the joint.It is revealed that the bonding joint has high shear strength up to 102 MPa bonded at 830℃,bonding pressure 10 MPa and bonding time 15 min.Shear test results show that the fracture takes place between the reaction layer and the Cu-10Sn bronze substrate,and the shear strength is strongly related to the formation of Cu-Ti-Sn intermetallic compounds.

钛/铝异种金属旋转摩擦焊接接头界面组织与性能

为了研究钛/铝异种金属旋转摩擦焊接接头界面金属间化合物形成的过程,对激光增材制造技术制备的Ti6Al4V和AlSi10Mg进行了旋转摩擦焊接,并通过显微组织分析、拉伸试验、硬度测试等手段研究了接头界面的组织和力学性能。从X射线衍射结果和EDS元素变化发现接头界面处形成了TiAl3相,SEM图也观察到焊接界面有脆性金属层的存在。通过显微组织表征和力学性能测试,系统地验证了界面生成较少的脆性金属化合物。