Effects Of Additional Elements On The Glass Forming Ability And Properties Of Zr-based Amorphous Alloys

In this paper,the amorphous formation,thermal stability,crystallization behavior and hardness of Zr Co Al amorphous alloy formation system were studied by adding Ag elements.Through single roller spray quenching method and copper casting,the preparation of the amorphous alloy sample at different temperature vacuum annealing crystallization in the amorphous alloy samples,using X-ray diffraction(XRD),differential scanning calorimeter(DSC),scanning electron microscopy(SEM),transmission electron microscope(TEM),optical microscope(OM),methods such as electrochemical workstation for characterizing the sample test,the main results are as follows:In amorphous alloy Zr₆₅Al_7.5Co_27.5-xAg_x(x=0-20%),glass transition and supercooled liquid phase occur when Ag content is 15%.When Ag content is equal to15%,the crystallization process of amorphous alloy is amorphous?quasicrystalline+amorphous?Zr₂Ag,Al Ag₃,Al₁₃Co₄ and Al₃Zr.When Ag content is lower than or higher than 15%,the crystallization process is as follows:amorphous?amorphous cluster?amorphous cluster+Zr+Zr₄(Al,Ag)₃?Zr₂Ag,Al Ag₃,Al₁₃Co₄ and Al₃Zr.The occurrence of quasicrystalline phase is closely related to vitrification transition and supercooled liquid phase region.The change of Ag content will affect the hardness of the alloy.The hardness of the amorphous alloy strip in the initial quenching state increases first and then decreases with the increase of Ag content,which is the highest when the Ag content is 15%.SAfter annealing,the hardness ratio of the sample increased obviously,but the hardness change had little relation with the type of the main precipitated phase.The corrosion resistance of the alloy increases with the increase of Ag content.