钛合金表面Ti/TiB2仿生多层膜的断裂韧性研究

Fracture toughness of Ti/TiB2 bionic multilayers on the surface of titanium alloy

摘要:

根据贝壳珍珠层的结构特点，以金属Ti层为软质层，对TiB2陶瓷薄膜进行仿生增韧处理，并通过压痕法研究了Ti/TiB2仿生多层膜的断裂韧性。研究结果表明：随着调制比(Λ, tTiB2:tTi)的增大，多层膜的断裂韧性先增大而后减小，当Λ为5时，多层膜的断裂韧度达到最大值(KIC=2.68 MPa

Abstract:

To enhance the fracture toughness of TiB2 ceramic film, Ti/TiB2 bionic multilayers was formed by intervention of period Ti layer which was abstracted into a soft layer according to the structural characteristics of nacre. The improved indentation method was proposed to characterize the fracture toughness (KIC) of the Ti/TiB2 bionic multilayers. The results show that the KIC of the multilayers strongly depends on the modulation ratios (Λ, the ratio of TiB2 to Ti thickness, is denoted tTiB2:tTi) and modulation period (T). With the increase of modulation ratio, the KIC of the multilayers increases first and gets a maximum of2.68 MPa