Effect of a Plastic Deformation by Upsetting on Properties of Invar Fe—35%Ni—0,49%Mn Alloy

V. M. Nadutov$^{1}$, D. L. Vashchuk$^{1}$, O. I. Zaporozhets’$^{1}$, A. A. Davidenko$^{2}$, Ye. O. Svystunov$^{1}$, Ye. V. Markovskii$^{1}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Donetsk Institute for Physics and Engineering Named after O.O. Galkin, NAS of Ukraine, 46 Nauky Ave., UA-03028 Kyiv, Ukraine

Received: 15.07.2015. Download: PDF

In this work, the properties of f.c.c. Invar Fe—35.0%Ni—0.49%Mn alloy after both the heat treatment and the plastic deformation by upsetting with strain degree $e$ = 1.1 are investigated. After the plastic deformation, the strain-induced state is formed, which affects both the magnetic subsystem and the interatomic interaction as it is evidenced by the reduction of $T_{C}$, the hyperfine magnetic field, the elastic modulus, and the Debye temperature. After upsetting, the alloy slightly changes its thermal expansion, nevertheless, maintaining the Invar behaviour. Due to changes of the magnetic contribution in the Grüneisen expansion, the coefficient $\alpha$ of the alloy deformed by upsetting is close to zero at temperatures below the room one, and in the range 220—350 K, it is negative. With forming the Invar product by upsetting, it is possible to provide strengthening, which is $\cong$ 30% for our case.

Key words: Invar Fe—Ni—Mn, upsetting, thermal expansion, Curie temperature, magnetization, hyperfine magnetic field, elastic moduli.

URL: http://mfint.imp.kiev.ua/en/abstract/v37/i08/1125.html

DOI: https://doi.org/10.15407/mfint.37.08.1125

PACS: 62.20.de, 65.40.De, 75.30.Cr, 75.50.Bb, 76.80.+y, 81.20.Hy, 81.40.Ef

Citation: V. M. Nadutov, D. L. Vashchuk, O. I. Zaporozhets’, A. A. Davidenko, Ye. O. Svystunov, and Ye. V. Markovskii, Effect of a Plastic Deformation by Upsetting on Properties of Invar Fe—35%Ni—0,49%Mn Alloy, Metallofiz. Noveishie Tekhnol., 37, No. 8: 1125—1133 (2015) (in Russian)

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