Magnetic and Invar properties of Fe-35 %Ni alloy after grinding of structure by hydroextrusion

• Published in: Functional Materials
• Date: 2012
• Main Authors: Nadutov, V.M., Vashchuk, D.L., Svystunov, Ye.O., Beloshenko, V.A., Spuskanyuk, V.Z., Davidenko, A.A.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2012
• Subjects: Characterization and properties
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/135311
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Magnetic and Invar properties of Fe-35 %Ni alloy after grinding of structure by hydroextrusion / V.M. Nadutov, D.L. Vashchuk, Ye.O. Svystunov, V.A. Beloshenko, V.Z. Spuskanyuk, A.A. Davidenko // Functional Materials. — 2012. — Т. 19, № 3. — С. 334-342. — Бібліогр.: 15 назв. — англ.

The impact of deformation of Invar Fe-35 % Ni alloy by hydroextrusion at room temperature on structure and its properties was studied. Grinding of grains, the structure fragmentation on 60 nm blocks and continuous increasing microstresses with growing e 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 (specific magnetization and the Curie temperature) and as a consequence to thermal expansion measured along the direction of the extrusion due to the microstresses growth and their partial relaxation. The hypothesis concerning the microstresses induced change of a balance between ferromagnetic and antiferromagnetic contributions to exchange interspin interaction is supposed.