| Publications on the project |
092 Structure and properties of Invar FCC Fe-35 %Ni alloy after hydroextrusion |
Authors: | Nadutov V.M., Vashchuk D.L., Volosevych P.Yu., Svystunov Ye.O., Beloshenko V.A., Spuskanyuk V.Z., Davidenko A.A. | |
Summary: | This paper presents the results of studies of the structure that is formed during hydroextrusion (HE) with the strain ε = 0,45 - 3,47, and the features of its influence on the hardness and the properties of the Invar alloy Fe-35% Ni. It is shown that plastic deformation leads to the formation of textured substructures, dimensional parameters which vary in proportion to their disorientation and lie in the range 50 - 120 nm while maintaining the much larger size of the structural elements 500 - 2500 nm. Established a nonmonotonic variation of the elastic microstrains depending on the degree of deformation with a maximum speed of their growth to the strain 1,48 and its subsequent deceleration to ε = 3,47, which explained the peculiarities of the formation of hierarchies of dimensional parameters of the substructure, the disorientation of the fragments, and the degree of organization of the boundaries between them. Established non-monotonic hardening of Invar alloys, due to a refinement of the substructure elements with increasing level of elastic microstrain processes and their dynamic relaxation. Found lower and relatively constant values TCLE deformed alloy -0,26 • 10-6 ÷ -0,73 • 10-6 K-1 at temperatures of 200 - 300 K. | |
Keywords: | Invar Fe-Ni, hydroextrusion, the Curie point, microstructure, thermal expansion, hardness | |
Edition: | Metalofizika i Noveishie Tekhnologii | | | 2012,
395-414,Russian |
092 Magnetic and Invar properties of Fe-35%Ni alloy after grinding of structure by hydroextrusion |
Authors: | Nadutov V.M., Vashchuk D.L., Svystunov Ye.O., Beloshenko V.A., Spuskanyuk V.Z., Davidenko A.А. | |
Summary: | The impact of deformation of the Invar Fe-35% Ni alloy by hydroextrusion (HE) at room temperature on structure and its properties was studied. The grinding of grains, the structure fragmentation upon 60 nm blocks and the continuous increasing microstrains with growing ε within the strain range of ε = 0,45 - 3,47 was shown. The multiple extrusion leads to a non-monotonic change of magnetic properties of the alloy (the specific magnetization and the Curie temperature) and as a result of thermal expansion measured along direction of the extrusion due to the microstrain growth processes and their partial relaxation. The hypothesize concerning the microstrain induced change of a balance between ferromagnetic and antiferromagnetic contributions to exchange interspin interaction is supposed. | |
Keywords: | Invar Fe-Ni, magnetisation, structure, hydroextrusion | |
Edition: | Functional properties | | | 2012,
334-342,English |
092 Structure and properties of the nInvar FCC alloy of Fe-35%Ni after combined plastic deformation by hydroextrusion and drawing |
Authors: | Nadutov V.M., Vashchuk D.L., Volosevych P.Yu., Beloshenko V.A., Spuskanyuk V.Z., Davidenko A.A. | |
Summary: | The influence of combine plastic deformation of the Invar Fe-35%Ni alloy by means of hydroextrusion (HE) ( = 3.47) and following drawing ( = 4.69) upon structure, the Invar and mechanical properties was studied using TEM, X-ray and dilatometric analysis and durometry. It was shown that the higher degree arrangement of boundaries of structural elements with dimensions up to 1 µm both in cross section and in longitudinal direction to deformation occurs in case of the combine plastic deformation. Therewith, there are high density of defects distribution which form honeycomb-like nanometer sized (till 100 nm) structures with the non considerable azimuthally disorientation (less than 1 grade) of their elements providing higher level of microstresses with respect to the samples after HE. It was established that the combine plastic deformation leads to decreasing TEC of the alloy at 225 – 325 К with respect to the hydroextruded state of the alloy particularly to negative values (min=-0.66•10-6 K-1 at 273 К) in longitudinal direction to deformation at simultaneously its strengthening by 20 - 30% as compared to the state of the alloy after HE. | |
Keywords: | Invar, hydroextrusion, drawing, structure, thermal expansion, microstressess, hardness | |
Edition: | High pressures physics and technics | | | 2012,
125-136,Russian |
092 Effect of high pressure treatment on structure and properties of Invar Fe-35%Ni alloy |
Authors: | Nadutov V.M., Vashchuk D.L., Volosevich P.Yu., Beloshenko V.A., Spuskanyuk V.Z., Davidenko O.A. | |
Summary: | The effect of high pressure (HP) treatment on change of the internal structure hierarchy of polycrystalline fcc Invar Fe-35,0% Ni alloy in quenched state and after hydroextrusion (HE) was studied. It was shown that treatment by 2 GPa of the quenched alloy is accompanied by the relief formation on the cross-section surface that caused by reorientation of available grains and by a change of grain boundaries state. The increase of density of twins of deformation and the saturation of structural elements by vacancies and dislocations were revealed that facilitate the grain boundary slipping. The HP processing of the previously HE treated samples of the Invar alloy (ε = 0,96 and 1,12) is not accompanied by notable differences in the structures hierarchy with the exception of decrease of texture and the increase of twins density that results from partial stress relaxation. | |
Keywords: | High pressure treatment, Invar alloy, Structure, Stress concentrators, Microhardness. | |
Edition: | Nanosystems, Nanomaterials, Nanotechnologies | | | 2013,
619-633,English |
092 Internal friction in Invar Fe-35% Ni alloy after combined SPD by hydroextrusion and drawing |
Authors: | Nadutov V.M., Vashchuk D.L., Volosevich P.Yu., Beloshenko V.A., Spuskanyuk V.Z., Davidenko A.A. | |
Summary: | The temperature dependence of internal friction on frequency of ~3 Hz and ~60 Hz were studied in Invar Fe–35.0%Ni–0.49%Mn-0.03%C alloy after annealing at 1373 K and combined severe plastic deformation (SPD) by hydroextrusion and subsequent drawing with the total degree of accumulated deformation ε = 4.69. The reduction of the relaxation IF peak intensity is observed in deformed sample of the alloy at ~380 К (the activation energy 0.82-0.93 eV) due to decreasing of mechanical and magnetomechanical relaxation losses as a result of carbon interaction with the crystal structure defects the contribution of which is renewed after ageing of the deformed alloy. The damping growth nearby temperatures 780-820 К after combined SPD and partial its reduction after ageing of the alloy were revealed that caused by migration of dislocation atmospheres under alternating fields of the elastic stresses and the overlapping recrystallization process. The estimated activation energy of the relaxation process is 1.82-1.97 eV. | |
Keywords: | Invar alloy, internal friction, relaxation peak, magnetomechanical losses, activation energy | |
Edition: | Functional materials | | | 2014,
52-58,English |
092 Effect of Magnetohydrodynamic Treatment of Melt of the Cuprous Hypereutectic Silumins on the Formation Processes of Strengthened Nanoparticles During the Ageing. |
Authors: | A.L. Berezina, V.I. Dubodelov, T.A. Monastyrska, V.N. Fikssen, N.A. Slazhniev, I.P. Skorobagatko | |
Summary: | The main purpose of this work was the study of the effect of the melt treatment in the magnetodynamic apparatus using the refining flux ARSAL and modification of phosphor bronze on structural changes and the properties of Al-Si alloys. The hypereutectic alloys Al-Si were chosen for the investigation. It was shown that such treatment of the melt in the magnetodynamic apparatus using the refining flux ARSAL and rationally chosen heat treatment of the solidificated alloys allow the increase of volume part of the nanoparticles formed during the ageing. As a result the matrix was strengthened and the hardness of the alloy under consideration increased by 60%. | |
Keywords: | hypereutectic Al-Si alloys, MHD technology, thermo-forced processing, nanocrystalline structure | |
Edition: | Metal Physics and Advanced Technology, 2011, v. 33, № 5, pp. 651-662 | | | 2011,
,Russian |
092 Effect of the thermo-mechanical treatment on the structure and properties of Al-Mg-Si alloys |
Authors: | A.L. Berezina, T.A. Monastyrska, О. А. Davydenko, V. Z. Spuskanyuk, A.V. Kotko | |
Summary: | The possibility of changing the structure and properties of the wrought low-alloyed inexpensive Al-Mg-Si alloy due to the use of different modes of severe plastic deformation (SPD) in combination with different types of thermal treatments. | |
Keywords: | alloy Al-Mg-Si, severe plastic deformation, hydrostatic extrusion, equal-channel angular hydroextrusion, accumulated strain, dynamic recrystallization | |
Edition: | High pressures physics and technics | | | 2012,
,Russian |
092 Hardening alloy AD-31 due to the thermo-mechanical treatment and deformation of specimens by hydroforming |
Authors: | A.L. Berezina, V. Z. Spuskanyuk, О. А. Davydenko, A.N. Gangalo, T.A. Zakoretska, T.A. Monastyrska, K.I. Perkova | |
Summary: | The effect of thermal treatments and deformation on mechanical properties of the alloy AD-31 was studied. The possibility of increasing the mechanical properties of the alloy through the use of various modes of deformation processing in combination with different types of heat treatments was found. | |
Keywords: | hydrostatic extrusion, equal-channel angular hydroextrusion, hardening, aging, tensile strength | |
Edition: | Materials working by pressure, 2013, № 1 (34), P. 149-153 | | | 2013,
,Russian |
092 Effect of severe plastic deformation on structure and properties of Al-Mg-Si alloy of 6060 type |
Authors: | M. Bournane, A. Berezina, О. Davydenko, T. Monastyrska, O. Molebny, V. Spuskanyuk, A. Kotko | |
Summary: | Сhanging the structure and properties of the wrought low-alloyed, inexpensive Al-Mg-Si alloy due to the use of different modes of severe plastic deformation (SPD) in combination with different types of thermal treatments both before and after SPD has been studied. It was shown that the use of SPD at room temperature for Al-Mg-Si alloy formed a heterogeneous deformation structure which is characterized by incomplete dynamic recrystallization. | |
Keywords: | Al-Mg-Si alloy, severe plastic deformation, thermal treatments, dynamic recrystallization | |
Edition: | Materials Science and Metallurgy Engineering, 2013, V. 1, No. 2, pp. 13-21 | | | 2013,
,English |
092 Features of the structure of the surface layers of Al-Mg-Si alloy after ultrasonic impact treatment |
Authors: | A.L Berezina, T.O. Monastyrska, G.I. Prokopenko, O.A. Molebny, S.S. Polishchuk, A.V. Kotko | |
Summary: | Dependence of the relaxation mechanisms of internal stresses which were caused by shock cyclic loading during the ultrasonic impact treatment and initial structural state of the Al-Mg-Si alloy was studied. | |
Keywords: | Al-Mg-Si alloy, ultrasonic impact treatment, structural state, relaxation mechanisms | |
Edition: | Metal Physics and Advanced Technology, 2014, Yol. 36, № 3, P. 329 – 342 | | | 2014,
,Russian |
092 Structure and properties of hypereutectic Al-Si alloy after severe plastic deformation |
Authors: | V. Z. Spuskanyuk, A.L Berezina, V.I. Dubodelov, О. А. Davydenko, V.N. Fikssen, K.I. Slyva, T.A. Monastyrska, A.N. Gangalo | |
Summary: | The effect of severe plastic deformation (SPD) on the structure and properties of age-hardening hypereutectic Al-Si alloy has been investigated. The composition of the alloy studied was Al-16.5%Si-3.77%Cu. Integrated thermoforce treatment of the liquid alloy (melt treatment in the magnetohydrodynamic apparatus using the modification of phosphorous copper) and the solid state (hot-pressing through the S-shaped angular matrix) were used. A “quasieutectic” structure was observed after SPD of the initial cast state and the homogenized state, which allowed ductility to be increased (up to 5.9%). Aging resulted in the increased strength (up to 459 MPa) and reduced plasticity (down to 0.6%). | |
Keywords: | hypereutectic silumin, MHD technology, thermo-forced processing, severe plastic deformation, equal channel angular pressing | |
Edition: | Metal Physics and Advanced Technology, 2014, Vol. 36, № 5, pp. 649-660. | | | 2014,
,Russian |
092 Structural Modification of Hypereutectic Al-16.5mass%Si Alloy by Thermo-Mechanical Treatment with ECAP |
Authors: | Victor Spuskanyuk, Alla Berezina, Victor Dubodelov, Oleksandr Davydenko, Vladyslav Fikssen, Kristina Sliva, Tetyana Monastyrska | |
Summary: | Evolution of the microstructure and mechanical properties of the hypereutectic Al-16.5mass%Si-3.77mass%Cu alloy by treatment in the liquid state by magnetohydrodynamic (MHD) methods, followed by processing in the solid state by equal channel angular pressing (ECAP) method and thermal treatment has been investigated. This alloy has in initial state a very low value of plasticity at room temperature. It was demonstrated that it is possible to significantly improve mechanical properties of this alloy by means of combining a low number of ECAP passes after an adequate combination of MHD+HD processing and thermal treatments | |
Keywords: | aluminum alloy, equal channel angular pressing, thermal treatment, microstructure, mechanical properties | |
Edition: | Materials Science and Metallurgy Engineering, 2014, 2 (3), pp. 35-40 | | | 2014,
,English |
| The events in the framework of the project |
|
092 Nadutov Volodymyr M.Professor, Doctor of sciences (physics & mathematics) Deputy Director for Science +380444243305
092 3.4. Physical foundations of nanomaterials in extreme conditions Purpose:The development of technological practices of the increase of physical and mechanical properties of aluminum and iron alloys by means of creation of the three-dimensional nanostructures at the expense of combination of thermo-forced treatments in different states of aggregation Expected results:Release of new product: material Stage 1:The methodological execution of obtaining and introduction into the alloy of ligature with the nanocrystal structure of refractory threealuminides Stage 2:Study of the change of structure and properties of the aluminum- and iron-based alloys after severe plastic deformation Stage 3:The execution of schemes and modes of the combined severe plastic deformation of studied alloys with the aim of their structure and properties optimization Stage 4:Study of structure and phase composition of the aluminum- and iron-based alloys after combined severe plastic deformation and subsequent ageing Stage 5:The study of phase transformations in the alloys, optimization of their thermal treatment modes after deformation, the determination of thermal stability level of the alloys, their physical and mechanical properties. The report preparation.
|
