Vacancy-Carbon Interaction in Iron

Hautojärvi, P.; Johansson, J.; Vehanen, A.; Yli‐Kauppila, J.; Moser, P.

doi:10.1103/physrevlett.44.1326

Cited by 106 publications

(50 citation statements)

References 17 publications

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“…In such conditions, a large number of point defects are generated. However, the coalescence of vacancy and void formation, for instance in Fe, takes place at low temperature [25]. When vacancy clusters are decorated by carbon or hydrogen atoms, they can be stable at a higher temperature, as it was observed by Moutanabbir et al [26] in silicon.…”

Section: Discussionmentioning

confidence: 77%

The Annealing Behavior of the Subsurface Zone Induced by Friction in Bismuth Detected by Positron Lifetime Technique

Dryzek

2013

Tribol Lett

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The annealing behavior of the subsurface zone (SZ) in pure bismuth induced by dry sliding was studied using the positron lifetime measurement. This measurement allows us to detect the SZ and its recovery, and recrystallization processes. The comparative measurements of the sample exposed to compression revealed the thermal stability of the SZ. The compressed sample rebuilt its structure due to the recovery and recrystallization processes at the temperature of 60°C, whereas the sample exposed to dry sliding does it at higher temperature of 260°C, which is close to the melting point. The isothermal annealing at the temperature of 100°C confirmed these results. The defect depth profile induced by dry sliding evolves with the annealing temperature in such a way that the concentration of defects at the worn surface gradually decreases, but at the depth between 50 and 170 lm, the generation of new defects takes place at the temperature of 75, 100 and even at 175°C. At the temperature of 175°C, the defects still are extended up to the depth of about 60 lm from the worn surface. The results were qualitatively confirmed by the measurements of the Vickers microhardness depth profile. Similar annealing behavior of the SZ was observed in pure magnesium.

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Section: Discussionmentioning

confidence: 77%

The Annealing Behavior of the Subsurface Zone Induced by Friction in Bismuth Detected by Positron Lifetime Technique

Dryzek

2013

Tribol Lett

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“…4b, remaining attached to five of the adjacent iron atoms. Positron annihilation studies indicate that the carbon atom is about 0.365a α from the vacancy center, forming a dumbell configuration with the vacancy [26]. In irradiated samples precipitation causes the carbon-vacancy complexes to dissociate at approximately 250 • C [27].…”

Section: Vacancy Type Complexesmentioning

confidence: 99%

Carbon–carbon interactions in iron

Bhadeshia

2004

Journal of Materials Science

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Carbon atoms occupy interstitial sites in iron so that the configurations of any solid-solution at constant composition depend solely on the distribution of carbon atoms on the interstitial sub-lattice, this in turn being influenced by interactions between carbon atoms in close proximity. The carbon-carbon interaction energy, which influences the distribution of carbon atoms, is reviewed with a view to understanding the nature of the interaction and to highlight some recent developments in the subject. It appears that the C-C interaction energy for ferrite cannot be deduced from the thermodynamic data currently available, primarily because of the very low solubility of carbon in ferrite. On the other hand, there is ample evidence to support the view that the corresponding energy for austenite is consistent with a strong repulsion between near neighbour pairs of carbon atoms.

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“…No additional impurities were seen within detectable limit of EPMA (∼ 0.01wt%). Owing to the importance of C content on the formation of vacancy-carbon complexes 18 and carbides, carbon content was measured using combustion method and was found to be 65 ± 10 ppm, which is well below the solubility limit of ∼ 450 ppm at room temperature. Samples of 8 × 12 × 0.3 mm dimensions were homogenized at 1423 K (inside γ loop) for 1 hr followed by air quenching.…”

Section: Methodsmentioning

confidence: 99%