Nanoscale thermodynamic study on phase transformation in the nanocrystalline Sm2Co17 alloy

Nanoscale
Wenwu XuMarkus Rettenmayr

Abstract

The characteristics of phase transformation in nanocrystalline alloys were studied both theoretically and experimentally from the viewpoint of thermodynamics. With a developed thermodynamic model, the dependence of phase stability and phase transformation tendency on the temperature and the nanograin size were calculated for the nanocrystalline Sm(2)Co(17) alloy. It is thermodynamically predicted that the critical grain size for the phase transformation between hexagonal and rhombohedral nanocrystalline Sm(2)Co(17) phases increases with increasing temperature. When the grain size is reduced to below 30 nm, the hexagonal Sm(2)Co(17) phase can stay stable at room temperature, which is a stable phase only at temperatures above 1520 K in the conventional polycrystalline alloys. A series of experiments were performed to investigate the correlation between the phase constitution and the grain structure in the nanocrystalline Sm(2)Co(17) alloy with different grain size levels. The experimental results agree well with the thermodynamic predictions of the grain-size dependence of the room-temperature phase stability. It is proposed that at a given temperature the thermodynamic properties, as well as the phase stability and phase transfo...Continue Reading

References

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Citations

Jul 1, 2015·Nanoscale·Martin SeyringMarkus Rettenmayr
Jan 25, 2017·Physical Chemistry Chemical Physics : PCCP·Fawei TangZuoren Nie
Jun 30, 2021·ACS Applied Materials & Interfaces·Shalini SharmaLambert Alff

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