Abstract
The work is devoted to a brief overview of the Interstitialcy Theory (IT) as applied to different relaxation phenomena occurring in metallic glasses upon structural relaxation and crystallization. The basic hypotheses of the IT and their experimental verification are shortly considered. The main focus is given on the interpretation of recent experiments on the heat effects, volume changes and their link with the shear modulus relaxation. The issues related to the development of the IT and its relationship with other models on defects in metallic glasses are discussed.
Highlights
Metallic glasses (MGs) constitute an amazing example of a man-made non-crystalline state, which is not observed in nature
Another important point realized by Granato was the understanding that the defect formation enthalpy is proportional to the unrelaxed shear modulus G, in line with earlier investigations [31,32]
Since the shear moduli GTsql and μ Tsql in the supercooled liquid state do not depend on the thermal prehistory, the only quantity in Equation (8), which varies upon structural relaxation, is the room-temperature shear modulus
Summary
Metallic glasses (MGs) constitute an amazing example of a man-made non-crystalline state, which is not observed in nature. Any commonly accepted theory describing their formation and main structural features has been absent far, and any general theory of non-crystalline substances is still lacking as well This largely constrains the development of new type MGs with the physical properties predicted in advance. It was demonstrated in recent years that the IT provides a powerful tool for the understanding and predicting different relaxation phenomena in MGs and unambiguously shows a genetic relationship of the glass with the maternal crystal This brief overview is firstly devoted to an analysis of the major hypotheses of the IT and main experiments related to its verification. A relation of the IT to other models of the metallic glass structure and its defects is discussed
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