Effect of Fe content on wetting behaviors and interfacial characteristics of TiZr-based bulk metallic glass/W substrate.

The wetting characteristics of Ti 32.8 Zr 30.2 Fe x Cu 14.3- x Be 22.7 (at.%, x = 0, 2.5, 5.3) bulk metallic glasses (BMGs) with W substrate are conducted using the sessile drop method at different temperatures. The effect of Fe content on wettability is systematically studied. At a given temperature, contact angle initially rises and subsequently declines as the Fe content increases from 0 at.% to 5.3 at.%. Optimal wettability is observed in BMGs devoid of the Fe element. This is attributed to the influence of Fe addition on the elemental diffusion behaviors and two-phase interfacial morphologies during wetting. The addition of 2.5 at.% Fe leads to a significant accumulation of Ti element at the wetting interface and prevents the wetting process. As the Fe content increases to 5.3 at.%, the conspicuous abundance of Fe in the glass phase together with the diffused Cu in W substrate determines the wettability of the system. These findings not only reveal the influence of Fe content on the wetting properties of the TiZr-based BMGs/W system but also provide a theoretical basis for the preparation of ex-situ BMG composites. • The contact angle first increases and then decreases with increasing Fe content. • Optimal wettability is observed in BMGs devoid of the Fe element. • Fe content has a significantly influence on the interface morphology of wetting. • Diffusion behavior of atomic clusters directly determines interfacial wettability. [ABSTRACT FROM AUTHOR]