Publication

Interfacial Debonding of Amorphous Silica Inclusions in Iron Dominated by the Austenite-to-Ferrite Transformation

Andreas Mortensen
2025

Abstract

Raman spectroscopy demonstrates that silica inclusions in arc-melted samples of Hernández-Escobar et al. (Metall Mater Trans B 55B:1–7, 2024) were amorphous. This excludes allotropic phase transformations within silica as a possible mechanism driving interfacial debonding within those samples. Coupling this result with Pindar and Pande (Metall Mater Trans B 56B:1–9, 2025) leads to conclude that allotropic transformations of either the matrix or inclusion can drive the interfacial debonding of silica inclusions from iron-based matrices during cooldown from processing temperatures.

Official source

https://infoscience.epfl.ch/entities/publication/f4f315e0-e2dc-4721-bf58-5c1814c3f18b

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Andreas Mortensen
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f4f315e0-e2dc-4721-bf58-5c1814c3f18b

About this result

Related concepts (30)

Quartz

Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at .

Opal

Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt.

Chert

Chert ('tʃɜrt) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood. Chert is typically composed of the petrified remains of siliceous ooze, the biogenic sediment that covers large areas of the deep ocean floor, and which contains the silicon skeletal remains of diatoms, silicoflagellates, and radiolarians.

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Interfacial Debonding of Amorphous Silica Inclusions in Iron Dominated by the Austenite-to-Ferrite Transformation

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