Abstract:Electrolytic tough pitch (ETP) and fire refined high conductivity (FRHC) copper samples were severely deformed at room temperature by equal channel angular pressing (ECAP) up to 16 passes (ε ~ 1 per pass), following route Bc. The effect of the initial texture on the evolution of texture after the ECAP process for both materials was analyzed. The annealed materials present a marked anisotropy, with a texture controlled by the <110> fiber. According to the orientation distribution function (ODF), this initial be… Show more
“…4, the ODF is only at ϕ = 0° and ϕ = 45° for the sequence of number of ECAP passes in the route A and Bc in the ambient temperature condition. As can be seen, using the ODF of cold processed samples by ECAP, the texture presented by the evolution of passes through route A, it was found that right after the first pass, the Brass component (B) (110) [11 2] appeared of recrystallization texture and after the second pass, the components C (001) [ It can be said that the results obtained are following those found in the literature, as can be seen in the research carried out by Higuera and Cabrera [20]. They processing copper by ECAP via the Bc route at ambient temperature and demonstrated that after the first pass was carried out, the material preferentially exhibited deformed fiber B, due to a high proportion of component C with a moderate presence of components B/𝐵 and A/𝐴 ̅ .…”
Among several severe plastic deformation (SPD) methods, the Equal Channel Angular Pressing (ECAP) process is one of the most popular. This process's main characteristic is producing materials with ultra-fine or nanometric grains. Due to these microstructural changes, it is possible to improve mechanical properties such as strength and ductility. In this perspective, the aim of the present work was to evaluate the variations of the mechanical hardness property associated with microstructural and textural changes of pure copper as a function of its processing by SPD via ECAP. For this, the material was submitted to four passes through routes A (the sample is repetitively pressed without any rotation between each pass) and Bc (the sample is rotated in the same sense by 90° between each pass) at cold and warm temperatures. Through the obtained result, it was verified that the ambient temperature of the Bc route was the one that promoted greater homogeneity in the microstructure and weakening of the texture after the fourth pass. On the other hand, warm processing of copper by ECAP promoted a softening of the samples and a homogeneous distribution of hardness in both routes.
“…4, the ODF is only at ϕ = 0° and ϕ = 45° for the sequence of number of ECAP passes in the route A and Bc in the ambient temperature condition. As can be seen, using the ODF of cold processed samples by ECAP, the texture presented by the evolution of passes through route A, it was found that right after the first pass, the Brass component (B) (110) [11 2] appeared of recrystallization texture and after the second pass, the components C (001) [ It can be said that the results obtained are following those found in the literature, as can be seen in the research carried out by Higuera and Cabrera [20]. They processing copper by ECAP via the Bc route at ambient temperature and demonstrated that after the first pass was carried out, the material preferentially exhibited deformed fiber B, due to a high proportion of component C with a moderate presence of components B/𝐵 and A/𝐴 ̅ .…”
Among several severe plastic deformation (SPD) methods, the Equal Channel Angular Pressing (ECAP) process is one of the most popular. This process's main characteristic is producing materials with ultra-fine or nanometric grains. Due to these microstructural changes, it is possible to improve mechanical properties such as strength and ductility. In this perspective, the aim of the present work was to evaluate the variations of the mechanical hardness property associated with microstructural and textural changes of pure copper as a function of its processing by SPD via ECAP. For this, the material was submitted to four passes through routes A (the sample is repetitively pressed without any rotation between each pass) and Bc (the sample is rotated in the same sense by 90° between each pass) at cold and warm temperatures. Through the obtained result, it was verified that the ambient temperature of the Bc route was the one that promoted greater homogeneity in the microstructure and weakening of the texture after the fourth pass. On the other hand, warm processing of copper by ECAP promoted a softening of the samples and a homogeneous distribution of hardness in both routes.
AA6060 aluminum alloy was subjected to severe plastic deformation (SPD) through Equal Channel Angular Pressing (ECAP) up to 8 passes via route BC. ECAPed samples isochronally annealed for 1 hour at a temperature range of 150-450 °C. The microstructure and texture of the studied material were evaluated by Electron Backscatter Diffraction (EBSD), and the microhardness was characterized by Vickers microhardness testing. It was found that shearing texture is typically enhanced after ECAP processing. Grain size and grain growth kinetics were also studied. ECAP led to a substantial rise in hardness, with stability following 4 passes. Microstructures and material properties were relatively stable up to annealing temperatures of 150 °C. Some sub-micrometer grains were kept 2 in the 8 passes sample to annealing temperatures of 300 °C. Annealing at elevated temperature resulted in a reduction in hardness leading to a rise in grain size and a decrease in dislocation density. After annealing temperature up to 450 °C, the texture index reveals a tendency to the texture weakening and randomization. The activation energy required for the grain growth of the AA6060 alloy was exceptionally low above 300 °C.
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