Name: Structure Induced Anelasticity in Iron Intermetallic Compounds and Alloys, color print edition
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Structure Induced Anelasticity in Iron Intermetallic Compounds and Alloys
Igor S. Golovin, Anatoly M. Balagurov
Materials Research Foundations Volume 30
Publication Date 2018, 256 Pages
Print ISBN 978-1-945291-64-7 (release date April 1st, 2018)
ePDF ISBN 978-1-945291-65-4
DOI: 10.21741/9781945291654

Different anelastic phenomena are discussed in this book with respect to iron-based binary and ternary alloys and intermetallic compounds of Fe3Me type, where Me are α-stabilizing elements Al, Ga, or Ge. An introduction into anelastic behavior of metallic materials is given, and methods of mechanical spectroscopy and neutron diffraction are introduced for the better understanding of structure-related relaxation and hysteretic phenomena.
To characterize structure and phase transitions – both first and second order – in the studied alloys XRD, TEM, SEM, MFM, VSM, PAS, DSC techniques were used. Considerable emphasis is placed on in situ neutron diffraction tests that were performed with the same heating and cooling rates as the internal friction measurements. Different types of mechanical spectroscopy techniques were used to study mainly, but not exclusively, Fe-Al, Fe-Ga and Fe-Ge based alloys: from subresonance “low” frequency forced bending and torsion vibrations (0.00001 to 200 Hz) to “high” frequency resonance (above ~200 Hz) free decay bending vibrations.
We discuss (1) thermally activated effects like Snoek-type relaxation, caused by interstitial atom jumps in alloyed ferrite, (2) Zener relaxation, caused by reorientation of pairs of substitute atoms in iron, (3) different transient effects due to phase transitions of the first and second order, and (4) amplitude dependent magneto-mechanical damping; especially with respect to structure, ordering of substitutional solid solution and phase transitions. Special attention is paid to magnetostriction of the alloys – the result of magneto-mechanical elastic coupling.

Keywords
Anelasticity, Damping Capacity, Magnetostricition, Structure Transitions, Phase Transitions, Fe-Based Alloys, Intermetallic Compounds, Mechanical Spectroscopy, In Situ Neutron Diffraction

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About the Authors

Professor Dr. Igor S. Golovin

I.S. Golovin graduated from Tula State University in 1982 and became a Ph.D. student at Moscow Central Research Institute for Physical Metallurgy, Moscow. He got his doctoral (Ph.D.) degree in 1987 and higher D.Sci. degree (Habilitation) in 1998. His research fields are functional alloys, anelasticity, mechanical spectroscopy, internal friction, phase transitions, atomic and magnetic ordering, neutron diffraction, mechanisms of relaxation in crystals, ultrafine grained metals, quasicrystals, hidamets, cellular metallic materials. After several years of working abroad, in 2008 he has accepted a permament position as a professor at National University of Science and Technology “MISIS”.

Professor Dr. Anatoly M. Balagurov

A.M. Balagurov graduated from Moscow State University in 1968 and received a research scientist position in Frank Laboratory of Neutron Physics of JINR (Dubna). He was principally responsible for the construction of time-of-flight diffractometers at the pulsed neutron sources in FLNP and development of neutron diffraction as a tool for condensed matter studies. His doctoral (Ph.D.) and higher D.Sci. (Habilitation) degrees are connected with structural studies of complex magnetic oxides (cuprates, manganites, cobaltites), multilayer lipid structures and materials of relevance to nuclear energy sector using neutron beams. In 2000 he was awarded the Russian State Prize for development and realization of neutron diffraction at steady state and pulsed neutron sources. At present he is chief scientist of FLNP, JINR and associated professor at Moscow State University.