Effect of Compression with Oscillatory Torsion Processing on Structure and Properties of Cu

Abstract

In this study, commercial Cu was subjected to plastic deformation by compression with oscillatory torsion. Different deformation parameters were adopted to study their effects on the microstructure and mechanical properties of Cu. The deformed microstructure was characterized by using scanning electron microscopy (SEM) equipment with electron backscattered diffraction (EBSD) facility and scanning transmission electron microscopy (STEM). The mechanical properties were determined on an MTS QTest/10 machine equipped with digital image correlation. Can be found, that process performed at high compression rate and high torsion frequency is recommended for the refining grain size. The size of structure elements: average grain size (D) and subgrain size (d) reached 0.42 m and 0.30 m respectively, and the fraction of high angle boundaries was 35%, when the sample was deformed at a torsion frequency f= 1.6 Hz and compression rate v=0.04 mm/s. Deformation at these parameters leads to an improvement in strength properties. The strength properties are about two times greater than the initial state.

Cu-Cr and Cu-Fe Alloys Processed by New Severe Plastic Deformation: Microstructure and Properties

“…The combination of these methods in a single deformation procedure enables the optimization of the microstructure and mechanical properties. COT investigations were performed for Cu and Al [14][15][16][17][18][19] and this method was recognized as an effective tool for obtaining ultrafine grains/subgrains with a mixture of low-and high-angle grain boundaries.…”

“…Annealed high-purity of Cu exhibits a low strength of nearly 100-200 MPa and attractive physical properties such as its high electrical conductivity. The extensive dynamic recovery balancing the multiplications and annihilation of the dislocations is the limiting factor for the grain refinement in Cu [15,16].…”

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

“…Higher concentration of Fe atoms in Cu-2% Fe alloy contributes in greater increase of dislocation density during deformation than in Cu-0.6% Cr alloy. It was shown in [31,32] that, during cyclic deformation with the increase of ε ft , a decrease in the dislocation density is observed. In the result the most of the grains are delineated with poorly defined boundaries with low misorientation angles (LABs).…”

“…A considerable variety of materials -pure metals and alloys with different crystal structure have been successfully processed by these methods [30,31]. Microstructure evolution of ultrafinegrained materials for different crystal structures processed by these method have been investigated as a function of strain and deformation parameters imposed to the material and correlated with mechanical properties of these materials [32,34].…”