Atomic redistribution of alloying elements in nanocrystalline austenitic chromium-nickel steels obtained by strong plastic deformation

Deryagin, A. I.; Завалишин, В. А.; Сагарадзе, В. В.

doi:10.1016/s0965-9773(98)00081-6

Cited by 7 publications

(3 citation statements)

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“…This discussion will focus on the third possible mechanism : an increase of the mobile vacancy concentration. Indeed, they are many examples in the literature of phase transformations induced by SPD and most of them seem to indicate that additional vacancies are produced during the deformation [36,[38][39][40][41]. In their theory on "driven alloys" Martin and Bellon even suggest that forced atomic jumps in ball-milled powders are due to additional vacancies which concentration is proportional to the milling intensity [42].…”

Section: Kineticsmentioning

confidence: 99%

Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu–Fe composite

Sauvage¹,

Wetscher²,

Pareige³

2005

Acta Materialia

230

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KeywordsSevere plastic deformation, nanocrystalline microstructure, atom-probe field ion microscopy, vacancies, bulk diffusion. AbstractA filamentary composite elaborated by cold drawing was processed by High Pressure Torsion (HPT). The nanostructure resulting from this severe plastic deformation (SPD) was investigated thanks to scanning electron microscopy, transmission electron microscopy, X-ray diffraction and 3D atom probe. Although the mutual solubility of Cu and Fe is extremely low at room temperature in equilibrium conditions, it is shown that nanoscaled Fe clusters dissolve in the Cu matrix. The non-equilibrium copper supersaturated solid solutions contain up to 20at.% Fe. The driving force of the dissolution is attributed to capillary pressures and mechanisms which could enhanced the atomic mobility during HPT are discussed. We conclude that the interdiffusion is the result of a dramatic increase of the vacancy concentration during SPD.

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Section: Kineticsmentioning

confidence: 99%

Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu–Fe composite

Sauvage¹,

Wetscher²,

Pareige³

2005

Acta Materialia

230

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“…Moreover, they are many examples in the literature of SPD induced phase transformations like solid state amorphization [7,8], cluster dissolution [8,9] or disordering [10]. Since the atomic mobility strongly depends on the vacancy concentration, SPD induced vacancies are though to play an important role on the kinetics of such phase transformations [11][12][13][14][15]. The aim of this work was to estimate the vacancy production rate during High Pressure Torsion (HPT).…”

Section: Introductionmentioning

confidence: 99%

3D-Atom Probe Investigation of Vacancy Induced Interdiffusion during High Pressure Torsion Deformation

Sauvage

2006

MSF

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Concentration gradients resulting from long range diffusion during Severe Plastic Deformation (SPD) have been investigated with the 3D Atom Probe technique (3D-AP). First, in a pearlitic steel where alloying elements (Mn, Si and Cr) are partitioned between the ferrite and carbides in the non-deformed state. After processing by High Pressure Torsion (HPT), they are homogeneously distributed in the nanostructure, indicating that long range diffusion occurred along with the dissolution of carbides. 3D-AP data of a Cu-Fe composite processed by HPT show as well a significant interdiffusion of Cu and Fe, probably promoted by additional vacancies. On the basis of these experimental data, and using the theory described for irradiated materials, vacancy fluxes and vacancy production rates were estimated assuming that new vacancies are continuously produced and eliminated on grain boundaries.

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“…Cold deformation induced phase transformations in high carbon steel were reported by Shabashov et al 54 During this process, different phases such as supersaturated solid solution of carbon in bcc iron, an austenite with a high carbon concentration, and metastable e-and x-carbides were formed owing to dissolution of the pearlite. Deryagin et al 55 found stable austenite in Cr-Ni steel that exhibits ferromagnetic properties. They suggested this is due to the local increase in Ni concentration in the austenite phase in Cr-Fe steel.…”

Section: Deformation Studiesmentioning

confidence: 99%

Study of materials using Mössbauer spectroscopy

Bandyopadhyay¹

2006

International Materials Reviews

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A comprehensive review is presented of the recent contributions Mo ¨ssbauer spectroscopy has made in materials science and engineering. After a brief introduction to the basic methodology, examples of the application of 57 Fe and 119 Sn Mo ¨ssbauer spectroscopy in both transmission and back-scattering mode are presented and discussed. Recent technological and software developments of this technique are also included. Coverage is further extended to recent, pertinent developments in space research and also in biological science and technology where Mo ¨ssbauer techniques are very widely used. Efforts have also been made to cover applications to archaeological samples where Mo ¨ssbauer spectroscopy is an important analytical tool.

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Atomic redistribution of alloying elements in nanocrystalline austenitic chromium-nickel steels obtained by strong plastic deformation

Cited by 7 publications

References 0 publications

Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu–Fe composite

Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu–Fe composite

3D-Atom Probe Investigation of Vacancy Induced Interdiffusion during High Pressure Torsion Deformation

Study of materials using Mössbauer spectroscopy

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