Microstructure refinement in Cu-Fe alloy using high pressure torsion

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Lukyanov, A.^1 ; Churakova, A.^1 ; Filatov, A.^2 ; Levin, E.^1 ; Valiev, R.^1 ; Gunderov, D.^1 ; Antipov, E.^2

Ufa State Aviation Technical University, Institute of Molecule and Crystal Physics, Russian Academy of Science, Ufa, Russia^1

Lomonosov Moscow State University, Moscow, Russia^2

关键词: As-cast;    Cast alloys;    Copper matrix;    Dendritic structures;    Effect of high pressure;    High pressure torsions;    Micro-structure evolutions;    Microstructure refinement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012102/pdf
DOI  :  10.1088/1757-899X/63/1/012102

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The effect of high pressure torsion (HPT) on the microstructure evolution 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 gm. As a result of HPT (20 anvil rotations at 400 °C) the refinement of a- Fe dendrites occurs, and a microstructure with Fe inclusions with a size from 0.1 to 5 gm uniformly distributed in the copper matrix forms. Subsequent annealing at 700 °C for 1 hour results in some coarsening of a-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 a-Fe particles less than 20 gm. 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.