Probing the decoupling degree between α and β relaxations in metallic glasses through differential scanning calorimetry
Source abstract
Abstract
The β relaxation is an intrinsic and crucial feature of metallic glasses (MGs). An interesting puzzle is that why the β relaxation exhibits different behaviors in different MGs. Here, a comprehensive studying strategy through differential scanning calorimetry is designed to evaluate the different β relaxations in La-based MGs. This method is based on the onset temperature and activation energy of sub- T g enthalpy relaxation ( Tonset and Eonset), the activation energy of glass transition ( Eg) and the critical annealing temperature ( Ta,C). Ta,C is the annealing temperature where the dynamic transition from β to α relaxation is observed. The origin of this transition resides in the different growth rate of medium range orders. The pronounced β relaxations are always associated with MGs exhibiting both larger E g/ Eonset and smaller Tonset/Ta,C. This finding provides an alternative avenue to evaluate the decoupling degree between α and β relaxations in MGs.
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Research context
OpenAlex topics: Material Dynamics and Properties · Metallic Glasses and Amorphous Alloys · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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