Учебное пособие 800637

II.

538.9

G

.

40

.

Pd40Ni40P20

( 3.1310.2017/4.6).

1.Estrin Y. Extreme grain refinement by severe plastic deformation : A wealth of challenging science / Y. Estrin, A. Vinogradov // Acta Amterialia. – 2013. – Vol. 61. – P. 782–817.

2.Dyre J.C. The glass transition and elastic models of glass-forming liquids / J.C. Dyre // Reviews of Modern Physics. – 2006. – Vol. 78. – P. 953–972.

3.Khonik V. Metallic glasses : A new approach to the understanding of the defect structure and physical properties / V. Khonik, N.P. Kobelev // Metals. – 2019. – Vol. 9. – P. 605-1–605-21.

4.Mitrofanov Y.P. Towards understanding of heat effects in metallic glasses on the basis of macroscopic shear elasticity / Y.P. Mitrofanov, D.P. Wang, A.S. Makarov, W.H. Wang, V.A. Khonik

//Scientific Reports. – 2016. – Vol. 6. – P. 23026-1–23026-6.

544.6

41

42

UDC 62-218.1

FORMATION OF THE ENHANCED DAMPING STATE IN HIGH-PURITY

COLD-ROLLED Fe-18Cr ALLOY

A.K. Mohamed1, M.Yu. Zadorozhnyy2, D.V. Saveliev3, I.B. Chudakov4, I.S. Golovin5 1PhD student, abdelkarim@misis.ru

2Dr, priboy38@mail.ru

3Dr, dimsav94@gmail.com

4Dr, i-chudakov@yandex.ru

5Prof, i.golovin@misis.ru

1,2,5National University of Science and Technology “MISIS”, Moscow, Russia

1Benha University, Shoubra Faculty of Engineering, Cairo, Egypt

3Russian Technological University “MIREA”, Pr. Vernadskogo, Moscow, Russia

4I.P. Bardin Central Research Institute for Ferrous Metallurgy, Moscow, Russia

Keyword: magneto-mechanically damped alloys; Grain size; spinodal decomposition; forced vibration; free decay; recrystallization temperature.

The vibration level in industry can be reduced using various vibro-isolating and vibroabsorbing devices based on viscoelastic organic materials [1, 2]. However, viscoelastic organic materials are characterized by low elastic modulus, and application of these materials re-

duces rigidity of the assembly. Also, organic materials cannot be used at elevated (higher than

200°C) or low (less than -70°C) temperatures, for instance in the satellite systems, where a small vibration of the laser beam makes the system useless. It is well-known that vibration, acoustic and operating properties of various precision devices can be improved with the help of High Damping Metals (HIDAMETs) [3, 4].

Fig. 3. Dependence of max. damping capacity on annealing temperature

The main structural mechanism of damping for the Fe-Cr alloys is magneto-

43

mechanical damping due to irreversible motion of magnetic domain walls (DWs), which also leads to a magnetostriction effect. In this investigation, we used cold-rolled (CR) sheets of a high-purity Fe-18Cr alloy to find out the correlation between heat treatment and damping capacity as well as magnetic properties including magnetostriction and grain size. Damping capacity of the samples was measured in several structural states after different annealing treatments using forced vibrations by means of dynamical mechanical analyzer Q800 TA Instru-

ment and self-made vibrating reed with free-decay of bending vibrations. The results show that the optimal properties for Fe-18Cr binary alloy were achieved after 800°C annealing of

the CR sheets. Slow cooling of the samples after high-temperature heat treatment causes a marked decrease of the impact toughness, reduction of damping capacity and increase in the coercive force of the Fe-18Cr alloy. This effect is caused by spinodal decomposition of the Fe-Cr solid solution and formation of local zones enriched with Cr. Damping capacity results are shown in the following Fig. 1, 2 and 3.

The work was carried out with support from the Ministry of Education and Science of

the Russian Federation in the framework of increase Competitiveness Program of NUST

“MISIS”, implemented by a governmental decree dated 16th of March 2013, No 211. This work was supported by the RNF project 19-72-20080.

References

1.T. Claudia, N. Valentin, L. Gabriel, Actual stage of industrial noise reduction, Journal of Engineering Studies and Research, 17 (2011) 89–95.

2.C.H. Hansen, B.I.F. Goelzer, Engineering noise control, 10 (2007) 245–296.

3.D.W. James, High damping metals for engineering applications, Mater. Sci. Eng., 4 (1969) 1–8. doi:10.1016/0025-5416(69)90033-0.

4.R. De Batist, High damping materials: mechanisms and applications, J. Phys. Colloq., 44 (1983) 39–50.

UDC 620.182

STUDY OF STRUCTURE, PHASE TRANSITIONS AND ANELASTIC EFFECTS IN Fe-x at.%Ga ALLOYS (x=25, 27, 33)

A.K. Mohamed1, V.V. Palacheva2, V.V. Cheverikin3, A.V. Pozdnyakov4, A.M. Balagurov5, I.A. Bobrikov6, J.- G. Gasser7, P. Tabary8, T. Mounier9, I.S. Golovin10

1PhD student, abdelkarim@misis.ru

2PhD student, lera.palacheva@mail.ru

3Dr, cheverikin80@rambler.ru

4Dr, pozdniakov@misis.ru

5Prof, bala@nf.jinr.ru

6Dr, bobrikov@nf.jinr.ru

7Prof, jean-georges.gasser@univ-lorraine.fr

8MSc student, paul.tabary@etu.emse.fr

9MSc student, theo.mounier0205@gmail.com

10Prof, i.golovin@misis.ru

1,2,3,4,8,9,10National University of Science and Technology “MISIS”, Moscow, Russia

1Benha University, Shoubra Faculty of Engineering, Cairo, Egypt

5,6Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia

5Lomonosov Moscow State University, Moscow, Russia 7Université de Lorraine. Laboratoire de Chimie et Physique, France

8Ecole des Mines de Saint-Etienne, 158 cours Fauriel, F-42023 Saint-Etienne, Cedex 2, France 9ENISE (Ecole Nationale d’Ingénieurs de Saint-Etienne), Cedex 2, France

Keywords: Neutron diffraction; Fe-Ga ; Phase transition; internal friction; activation energy; phase characterization; In situ resistivity measurement.

44

One of the reasons for the promise of Magnetostrictive materials in a host of applications is the development of a new class of structural magnetostrictive materials. Iron–gallium alloys (galfenol) exhibit moderate magnetostriction ( 350 ppm) under very low magnetic fields 100 Oe (8000 A.m−1), have very low hysteresis, and demonstrate high tensile strength (500 MPa) and limited variation in magnetomechanical properties for temperatures between −20 and 80oC [1]. They have a high Curie temperature [1] and are corrosion resistant [2] and biodegradable [3]. The raw materials used to produce FeGa alloys are relatively inexpensive [2].

Several research techniques were used to study structure and phase transitions at heating and cooling of three Fe-Ga alloys with 25, 27 and 33 at.% Ga. Structure of these alloys in the as cast state and after different annealing regimes were characterized by XRD, SEM, MFM, HV and low-temperature heat capacity. Using high resolution neutron diffraction, it is proved that initial state of the as cast samples has the high temperature BCC-derivative D03

phase which is metastable at room temperature. Heating of the as cast samples and their sub- sequent cooling lead to a cascade of phase transitions changing sample’s structure, mechani-

cal and physical properties including damping capacity. The phase transitions were characterized by in situ neutron diffraction, internal friction, resistivity, vibrating sample magnetometry, dilatometry, and differential scanning calorimetry. Activation energy and relaxation time were calculated for thermally-activated relaxation peaks. Transition from metastable D03 to stable L12 phase at heating or isothermal annealing leads to significant changes in macro (grain size) and micro (atomic ordering) structure, hardness and magnetic properties (magne-

tostriction, magnetization and internal friction). According to our structural studies ND which shown in the following figure, composition Fe-25.5 at.% Ga below 600°C belongs to a sin-

gle phase (L12) range in contrast with existing equilibrium phase diagrams.

Figure. Temperature dependences of the intensities of fundamental diffraction peaks and their first

derivatives (transformation rate, right upper Y-axe) of different phases during the transition from the initial (D03 phase at RT) to the final (A2 phase above 750°C) state of the alloy Fe-25.5Ga (a),

and of the alloy Fe-26.9Ga as well (b) during heating

The work was carried out with support from the Ministry of Education and Science of

the Russian Federation in the framework of Increase Competitiveness Program of NUST

“MISIS”, implemented by a governmental decree dated 16th of March 2013, No 211 and RNF project no. 19-72-20080.

References

1.R.A. Kellogg, Development and modeling of iron–gallium alloys, PhD Thesis Engineering Mechanics, Iowa State University, Ames, Iowa, 2003.

2.T.V. Jayaraman, N. Srisukhumbowornchai, S. Guruswamy, M.L. Free, Corrosion studies of single crystals of iron–gallium alloys in aqueous environments, Corros. Sci. 49 (2007) 4015–4027. doi:10.1016/j.corsci.2007.05.010.

45

3. H. Wang, Y. Zheng, J. Liu, C. Jiang, Y. Li, In vitro corrosion properties and cytocompatibility of Fe-Ga alloys as potential biodegradable metallic materials, Mater. Sci. Eng. C. 71 (2017) 60– 66. doi:10.1016/j.msec.2016.09.086.

678.5.046

lnQ-1 ~ (1/T).

46

48