Effect of Ti addition on crystallization behavior of a Zr-based bulk metallic glass
2022
The isochronal and isothermal crystallization characteristics of (Zr₅₄Al₁₀.₂Ni₉.₄Cu₂₆.₄)₁₀₀₋ₓTiₓ (x = 0∼0.5 at.%) bulk metallic glasses (BMGs) were investigated by differential scanning calorimetry. The isochronal crystallization indicates that both crystallization activation energy and local activation energy Eα of the Ti-free BMG are larger than those of the BMGs (x = 0.2 and 0.4), while smaller than those of the BMGs (x = 0.1, 0.3 and 0.5). The isothermal crystallization shows that the Eαs decrease with increasing crystallization fraction for the first crystallization process and nearly maintain a constant for the second crystallization process. Moreover, the crystallization phases are ZrNi and Zr₂Ni₇ nanocrystals for the partially and/or fully crystallized BMGs in isochronal and isothermal cases. The crystallization mechanism nearly depends on the Ti content and the heating rate for the isochronal crystallization and the Ti content and the annealling temperature for the isothermal crystallization, respectively.
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