Effect of Heat Treatment Temperature on Microstructure of Co28Fe28Ni19Si13B12 High Entropy Amorphous Alloy
The crystallization behavior,thermal stability and microstructure of Co28Fe28Ni19Si13B12 high en-tropy amorphous alloy were studied by differential scanning calorimetry(DSC),X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results showed that Co28Fe28Ni19Si13B12 high entropy amorphous alloy had good glass forming ability(GFA)and high thermal stability.The initial crystallization activation energy Ex was lower than the peak crystallization activation energy Ep,indicating that the grain growth was more difficult than the grain nucleation during crystallization process.The alloy underwent two crystallization processes,the Co7Fe3 phase and Fe-B,Ni74Si26 phases were formed as the corresponding crystallization products.After annealing at a higher temperature corresponding to the right side of the endo-thermic peak,the Co7Fe3 phase disappeared and the new(Ni,Fe)phase appeared,while Fe2B,Ni13Si12 and Co2B phases still exist in the alloy.
high entropy alloyamorphouscrystallization behaviorthermal stabilitymicrostructure
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