Evolution of Structure and Properties of Ni47Mn42In11 Alloy after Plastic Deformation
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Results of the study of the effect of various types of plastic deformation on microstructural features and change in physical and mechanical properties of the nonstoichiometric Heusler alloy Ni47Mn42In11 are shown. It was demonstrated that the deformation by rolling and upsetting leads to an increase in the microhardness and to an embrittlement of the investigated alloy. Severe plastic deformation by torsion under high pressure of 8 GPa at room temperature was found to strongly refine initially coarse grain and to contribute to the formation of a nanocrystalline structure with grain fragments up to 10 nm. In this case, the fraction of viscous constituent on the fracture and the microhardness increased, while the magnetic susceptibility decreased.
Keywords:ferromagnetic alloys phase transformation high pressure deformation martensite structure microhardness fracture
The authors are grateful to V.P. Pilyugin for the help in carrying out experiments on severe plastic deformation and to N.V. Nikolaev for the help in carrying out studies using a scanning microscope. The authors are also indebted to E.G. Gerasimov for help in carrying out magnetic measurements and for participation in the discussion of the results.
The work was carried out under the state task (theme “Structura,” no. АААА-А18-118020190116-6).
CONFLICT OF INTEREST
The authors declare that they have no conflicts of interest.
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