Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. Founded at 2009

STRUCTURE REFINEMENT PECULARITIES AND SOLID SOLUTION FORMATION IN THE CAST Cu – Fe ALLOY, SUBJECTED TO SEVERE PLASTIC DEFORMATION

A.V. Lukyanov, A.A. Churakova, A.V. Ganeev, V.D. Sitdikov, D.V. Gunderov

DOI: 10.26456/pcascnn/2014.6.231

Original article

Abstract: The effect of high pressure torsion (HPT) on the microstructure of Cu – Fe 36% wt alloy has been studied. The initial Cu – Fe alloy has a dendritic structure, the length of dendrites is up to 100 µm. As a result of HPT (20 anvil rotations at 400°C ) the nanostructured state is formed. The average grain size of the Cu − and α − Fe is 60 and 35 nm correspondingly. The refinement of α − Fe dendrites occurs, and a microstructure with Fe inclusions with a size from 0,1 to 5 µm distributed in the copper matrix forms. A volume fraction of the Fe phase reduces from initial 37% up to 15% after HPT. The concentration of copper in the lattice dissolved iron reaches 20%. Subsequent annealing at 700°C for 1 hour results in some coarsening of α − Fe particles, as compared to the state after HPT. However, the dendritic structure typical of the cast alloy does not recover; it remains dispersed with a size of α − Fe particles less than 20 µm. As a result of HPT the alloy microhardness increased from 1800 to 4000 MPa. The subsequent annealing at T = 700°C decreased the microhardness to 2700 MPa, but this value is 1,5 times higher than that in the initial as-cast state.

Keywords: nanocomposite, high pressure torsion deformation, Cu Fe − alloy

  • A.V. Lukyanov
  • A.A. Churakova
  • A.V. Ganeev
  • V.D. Sitdikov
  • D.V. Gunderov

Reference:

Lukyanov A.V., Churakova A.A., Ganeev A.V., Sitdikov V.D., Gunderov D.V. Osobennosti izmelcheniya struktury i formirovaniya tverdogo rastvora v sisteme Cu – Fe pri vozdejstvii intensivnoj plasticheskoj deformatsii [STRUCTURE REFINEMENT PECULARITIES AND SOLID SOLUTION FORMATION IN THE CAST Cu – Fe ALLOY, SUBJECTED TO SEVERE PLASTIC DEFORMATION], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2014, issue 6, pp. 231-238. DOI: 10.26456/pcascnn/2014.6.231. ⎘

Full article (in Russian): download PDF file

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