CHARACTER OF THERMALLY ACTIVATED MOTION OF ATOMS RELATED TO THE DUCTILE-BRITTLE TRANSITION OF AMORPHOUS ALLOYS
非晶态合金延─脆转变过程原子热激活运动特征

Through the determination of the values of activation energy for embrittlement under isothermal and isochronal conditions.the correlation between the ductile-brittle transition and thermally activated motion of atoms of the amorphous alloys in annealing has been revealed. And the character of thermally activated motion of atoms related to the embrittlement has been described. The matching of the values of activation energy for embrittlement determined under different conditions demonstrates that the potential barriers existed in the ductile-brittle transitions of the amorphous alloys in both isothermal and isochronal anneals are the same,and verifies the close relationship between annealing embrittlement and the thermally activated motion of atoms. The continued increase of activation energy for embrittlement during the brittling process and the correspondence of activation energy values with different transition stages characterize the ductile-brittle transition of amorphous alloys,so the transition is not the simple activating process with a constant activation energy.