Modeling the Snoek peak in bct-martensite

Philippe Maugis (1, 2) , Liangzhao Huang (1, 2)

1 AMU SCI - Aix-Marseille Université - Faculté des Sciences
2 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

Snoek relaxation in bcc crystals is the delayed strain response to an applied stress resulting from the interaction of the interstitial atoms with the stress field. It is responsible for the Snoek peak observed in internal friction measurements of ferrite. However, although martensite is carbon supersaturated, several authors denied the possibility of Snoek relaxation in bct-martensite. We investigated this matter by means of Monte Carlo simulations and mean-field thermo-kinetic modeling. Our results show that Snoek relaxation does occur in bct-martensite. The computed Snoek profiles of temperature-dependent and frequency-dependent internal friction exhibit unexpected features: both peak height and peak temperature decrease when the carbon content is increased. We explain this behavior in the frame of the linear-response approximation. Our theoretical predictions are in qualitative agreement with experiments.

Mots clés: Anelastic behavior; Internal friction; Long-range ordering; Carbon steels; Mean-field modeling; Monte Carlo simulation

Domaines: Matériaux

Philippe Maugis, Liangzhao Huang. Modeling the Snoek peak in bct-martensite. Journal of Alloys and Compounds, 2022, 907, pp.164502. ⟨10.1016/J.JALLCOM.2022.164502⟩. ⟨hal-04018934⟩