Peculiarities of deformation-induced amorphization in CoZrNi alloys

  • Novikova E
  • Tatyanin Y
  • Kurdjumo V
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In previous studies it was shown that an amorphous state in the intermetalhc compound NiTi can be produced by shear under pressure, hydroextrusion or cold-rolling [l-5]. A volume fraction of amorphous phase was demonstrated to be dependent on deformation value. The amorphous phase nucleation was observed at the twin boundaries in NiTi. Then it was shown that further growth of the amorphous component takes place in this alloy simultaneously with the fragmentation process at which the fragmentation size decreases with increasing strain. Similar structural changes were revealed for amorphization in the intermetallic compound Ni 3 Al [6] and in Si [7] by mechanical milling. The latter permitted one to assume that the mechanism of defbrmation-induced amorphization (DIA) is co~ected with the fragmentation up to the critical size. Other approaches for the explanation of deformation-induced amorphization were proposed in [5,8,9]. It was &resting to examine as far as the observable structural changes are characteristic for DIA in other materials. This paper is basically concerned with the initial stages of DIA in CoZrNi alloys.

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  • E. E. Novikova

  • Ye V. Tatyanin

  • V. G. Kurdjumo

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