Modeling the Snoek peak in bct-martensite

• Published in: Journal of alloys and compounds Vol. 907; p. 164502
• Main Authors: Maugis, Philippe, Huang, Liangzhao
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.06.2022; Elsevier BV; Elsevier
• Subjects: Anelastic behavior; Carbon content; Carbon steels; Chemical Sciences; Internal friction; Long-range ordering; Martensite; Material chemistry; Mean-field modeling; Modelling; Monte Carlo simulation; Qualitative analysis; Stress distribution; Temperature dependence; Anelastic behavior; Carbon steels; Mean-field modeling; Long-range ordering; Internal friction; Monte Carlo simulation
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.164502

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. •The existence of Snoek relaxation in bct-martensite is demonstrated theoretically.•The Snoek peak height decreases when the solute carbon content is increased.•The peak temperature is carbon-content dependent.