Application de la methode de dosage en surface a l'aide des reactions nucleaires pour l'evaluation de l'interference surface-masse

Quaglia, L.; Weber, G.

doi:10.1007/bf02520776

“…Atomic diffusion, the features of the localization of penetrating atoms and changes in the phase composition on the surface of the treated metals and in the transition zone between the coating and the matrix were studied using a set of standard methods based on various principles [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. This provided not only the reliability of the results obtained, but also a variety of data on phase formation processes, which cannot be obtained by one particular method.…”

Section: Fig 1 Apparatus For Spark Discharge Treatmentmentioning

confidence: 99%

“…Some of these methods can disclose the process of atom displacement and the formation of new phases, other methods can be used to determine their crystal structure and morphology, some other methods identify their chemical composition or show the features of their localization. tion, primarily those involving the use of radioactive isotopes, were used to identify the shape of the concentration profile for penetrating atoms [14][15][16][17][18][19][20][21][22][23][24]. Radioactive indicators were employed to study the process of redistribution of atoms to plot a concentration curve for isotope depth distribution.…”

Section: Fig 1 Apparatus For Spark Discharge Treatmentmentioning

confidence: 99%

“…Macroautoradiography was another method used for large penetration depths [15]. To study the structural, concentration and chemical inhomogeneities in both the surface layers and the bulk of the metal layers, well-known methods of microautoradiographic [16][17][18][19] and electron microscopic autoradiography were used, including activation autoradiography [20][21][22][23][24]. The distribution of penetrating atoms in the coating and bulk material was estimated by the method of secondary ion mass spectroscopy (SIMS) using a microscanner [25].…”

Section: Fig 1 Apparatus For Spark Discharge Treatmentmentioning

confidence: 99%

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Interaction of metals and alloys with gas media under spark discharges

Mironov¹,

Миронов²,

Mazanko³

et al. 2018

REFFIT

2

0

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The paper studies the penetration of nitrogen, oxygen, hydrogen, carbon, argon and krypton into copper, nickel, molybdenum, titanium, aluminum, iron and different steels under the action of spark discharges in various media based on radioactive indicators using step-by-step radiometric analysis, macro-, micro-, electron-microscopy and activation autoradiography, Mössbauer and Auger spectroscopy, secondary ion-ionic emission, X-ray diffraction and X-ray microanalysis. The study describes distribution features of penetrating atoms and their concentration profiles. Phase composition of near-surface layers is also determined. It is shown that supersaturated solid solutions of iron in copper and copper in iron are formed during simultaneous iron and oxygen penetration in copper and spinel (Fe6Cu3O4)4. Diffusion of iron and carbon results in supersaturated solid solutions of iron and carbon in copper, copper and carbon in iron, graphite and cementite. Inert gases and nitrogen form solid solutions with copper. Phase composition of near-surface layers in Fe is determined. Iron dioxide FeO, a carbon solid solution in iron with fcc lattice γ-Fe, tetragonal martensite and cementite, two iron (III) hydroxide FeOOH modifications, a supersaturated solid solution of nitrogen and nitride Fe4N, solid solutions of inert gases in iron are formed in the diffusion zone. Simultaneous interaction of molybdenum with iron (the anode material) and various gases results in the formation of substitutional solid solutions of iron in molybdenum and molybdenum in iron, a small amount of interstitial solid solutions of nitrogen and carbon in molybdenum and nitrogen in iron, interstitial phases: molybdenum nitrides and carbides and traces of nitrides of iron (Fe4N, Fe2N) and Fe1,9Mo (λ) phases in the form of needles. Treatment of nickel with a nickel anode in the nitrogen medium promotes formation of a solid solution of nitrogen and nitride Ni3N in the matrix with preserved hexagonal symmetry and lattice parameters that are characteristic of this phase under equilibrium conditions. Atoms of oxygen, nitrogen, carbon and argon are present in the interstitial solid solutions in treatment of nickel in ambient air; however, oxides are not found even on the surface (in the layer ~200 nm). Interaction of titanium with atmospheric gases leads to formation of a solid solution of nitrogen, oxygen, carbon, hydrogen and argon in titanium and titanium nitride Ti2N (ε). Simultaneous saturation of the titanium surface with nickel and nitrogen in the interaction zone causes formation of phases in the following order: nickel nitride; a solid solution of nitrogen and titanium in nickel and a solid solution of both alloying elements in titanium.

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“…Atomic diffusion, the features of the localization of penetrating atoms and changes in the phase composition on the surface of the treated metals and in the transition zone between the coating and the matrix were studied using a set of standard methods based on various principles [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. This provided not only the reliability of the results obtained, but also a variety of data on phase formation processes, which cannot be obtained by one particular method.…”

Section: Fig 1 Apparatus For Spark Discharge Treatmentmentioning

confidence: 99%

“…Some of these methods can disclose the process of atom displacement and the formation of new phases, other methods can be used to determine their crystal structure and morphology, some other methods identify their chemical composition or show the features of their localization. Different methods of investiga- tion, primarily those involving the use of radioactive isotopes, were used to identify the shape of the concentration profile for penetrating atoms [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Fig 1 Apparatus For Spark Discharge Treatmentmentioning

confidence: 99%

Interaction of metals and alloys with gas media under spark discharges

Mironov¹,

Mironov²,

Mazanko³

et al. 2018

REFFIT

0

View full text Add to dashboard Cite

The paper studies the penetration of nitrogen, oxygen, hydrogen, carbon, argon and krypton into copper, nickel, molybdenum, titanium, aluminum, iron and different steels under the action of spark discharges in various media based on radioactive indicators using step-by-step radiometric analysis, macro-, micro-, electron-microscopy and activation autoradiography, Mössbauer and Auger spectroscopy, secondary ion-ionic emission, X-ray diffraction and X-ray microanalysis. The study describes distribution features of penetrating atoms and their concentration profiles. Phase composition of near-surface layers is also determined. It is shown that supersaturated solid solutions of iron in copper and copper in iron are formed during simultaneous iron and oxygen penetration in copper and spinel (Fe6Cu3O4)4. Diffusion of iron and carbon results in supersaturated solid solutions of iron and carbon in copper, copper and carbon in iron, graphite and cementite. Inert gases and nitrogen form solid solutions with copper. Phase composition of near-surface layers in Fe is determined. Iron dioxide FeO, a carbon solid solution in iron with fcc lattice γ-Fe, tetragonal martensite and cementite, two iron (III) hydroxide FeOOH modifications, a supersaturated solid solution of nitrogen and nitride Fe4N, solid solutions of inert gases in iron are formed in the diffusion zone. Simultaneous interaction of molybdenum with iron (the anode material) and various gases results in the formation of substitutional solid solutions of iron in molybdenum and molybdenum in iron, a small amount of interstitial solid solutions of nitrogen and carbon in molybdenum and nitrogen in iron, interstitial phases: molybdenum nitrides and carbides and traces of nitrides of iron (Fe4N, Fe2N) and Fe1,9Mo (λ) phases in the form of needles. Treatment of nickel with a nickel anode in the nitrogen medium promotes formation of a solid solution of nitrogen and nitride Ni3N in the matrix with preserved hexagonal symmetry and lattice parameters that are characteristic of this phase under equilibrium conditions. Atoms of oxygen, nitrogen, carbon and argon are present in the interstitial solid solutions in treatment of nickel in ambient air; however, oxides are not found even on the surface (in the layer ~200 nm). Interaction of titanium with atmospheric gases leads to formation of a solid solution of nitrogen, oxygen, carbon, hydrogen and argon in titanium and titanium nitride Ti2N (ε). Simultaneous saturation of the titanium surface with nickel and nitrogen in the interaction zone causes formation of phases in the following order: nickel nitride; a solid solution of nitrogen and titanium in nickel and a solid solution of both alloying elements in titanium.

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