New discoveries and insights into the glass transition

New discoveries and insights into the glass transition
DSC traces of the La(Ce)NiAl system, the arrows indicate the calorimetric glass-transition temperature (Tg) (left). The Temperature dependence of the loss modulus of the La(Ce)NiAl system normalized by the maximum peak value. The arrows indicate the α-relaxation temperature (Tα) (right). Credit: Tohoku University

A collaborative group from Tohoku University and Johns Hopkins University have provided valuable insights into the glass transition.

When a liquid is cooled rapidly, it gains viscosity and eventually becomes a rigid solid glass. The point at which it does so is known as the .

But the exact physics behind the glass transition, and the nature of glass in general, still pose many questions for scientists.

Metallic Glasses (MGs) are highly sought after since they combine the flexibility of plastic with the strength of steel. They are with a disordered and exhibit unique and divergent thermodynamic and dynamic characteristics, especially when approaching the glass-transition temperature.

The glass transition in MGs is usually determined by calorimetric and dynamical measurements. The calorimetric glass transition detects the temperature at which has an abrupt jump, whereas dynamical transition looks at the diverse relaxation responses that emerge with increasing temperature forms.

Generally, the calorimetric glass-transition temperature follows the same trend as the dynamic α-relaxation temperature.

However, the collaborative group discovered that high configuration entropy significantly influences the glass transition of MGs and leads to the decoupling between calorimetric and dynamical glass transitions of high entropy metallic glasses.

The results of their research were published in the journal Nature Communications on June 22, 2021.

Their study presents a new glass-forming system that uses high configurational entropy, named high entropy metallic glasses (HEMGs).

The group featured Specially Appointed Professor Jing Jiang and Professor Hidemi Kato from the Institute for Materials Research at Tohoku University and Professor Mingwei Chen from Johns Hopkins University.

"We are excited about this discovery and believe this work furthers our understanding of the fundamental mechanism behind the transition," said members of the research group.


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More information: Jing Jiang et al, Decoupling between calorimetric and dynamical glass transitions in high-entropy metallic glasses, Nature Communications (2021). DOI: 10.1038/s41467-021-24093-w
Journal information: Nature Communications

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Citation: New discoveries and insights into the glass transition (2021, July 16) retrieved 5 August 2021 from https://phys.org/news/2021-07-discoveries-insights-glass-transition.html
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