Publication

Thermally activated and transient anelasticity due to phase transitions in Fe-27Ga alloy

Daniele Mari
2026

Abstract

Transient and thermally activated anelastic effects between 0 and 800 °C are studied in in a Fe-26.6at%Ga alloy using bending and torsion forced vibrations and measuring the mechanical loss ant the elastic modulus. The structure characterization and transformations are studied by in situ neutron diffraction. The phase morphology and grain crystal structure are investigated by EBSD. Vibrating sample magnetometry accompanies those measurements providing the magnetic susceptibility that characterize the phases appearing as a function of the temperature. Two thermally activated and three transient anelastic effects are reported. They are discussed in detail with respect to structure and phase transitions in the alloy. Four main phases are found: D03, L12, D019 and A2. Each transformation between these phases is characterized by a transient mechanical loss peak and a modulus variation. The thermally activated relaxations named P1 and P2 are respectively a Snoek and a Zener relaxations and they are related to the presence of the metastable D03 phase.

Official source

https://infoscience.epfl.ch/entities/publication/92758732-1a85-4ec1-b14b-c21edb4e4841

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Daniele Mari
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/92758732-1a85-4ec1-b14b-c21edb4e4841

About this result

Related concepts (32)

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Viscoelasticity

In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Elastic materials strain when stretched and immediately return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain.

Bulk modulus

The bulk modulus ( or ) of a substance is a measure of the resistance of a substance to bulk compression. It is defined as the ratio of the infinitesimal pressure increase to the resulting relative decrease of the volume. Other moduli describe the material's response (strain) to other kinds of stress: the shear modulus describes the response to shear stress, and Young's modulus describes the response to normal (lengthwise stretching) stress. For a fluid, only the bulk modulus is meaningful.

Related publications (32)

Thermally activated and transient anelasticity due to phase transitions in Fe-27Ga alloy

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