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Softening and Microstructure Evolution of Pure Copper Disks Processed by High Pressure Torsion

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Abstract

In this study after designing and manufacturing HPT’s anvils, copper disks with more than 99.99% purity were processed by HPT at two selected pressures for various turns. The results showed that the softening of Cu processed disks occurs very quickly. Also, the softening range expanded from near the edge to near the center of processed disks, and this range was more expanded by increasing turns and pressure. The uniformity of hardness along the radius of the processed disk was obtained at a pressure of 1.25 GPa for 2 turns. Microhardness-equivalent strain plots showed a maximum pick at the strain of 2–3 and then it reached a steady-state at the equivalent strain of 5–6. Mean crystallite size and dislocation density were calculated using the Rietveld refinement method from XRD patterns. The results illustrated mean crystallite size and dislocation density due to recrystallization and recovery decreased by increasing pressure and turn. These results could help long-time applications of copper processed by SPD processes that are unusable due to long-time softening.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Authors and Affiliations

  1. Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, 1983969411, Tehran, Iran

    Seyed Amin Hosseini Kahnooj, Majid Vaseghi & Mahmood Sameezadeh

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  1. Seyed Amin Hosseini Kahnooj
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  2. Majid Vaseghi
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  3. Mahmood Sameezadeh
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Correspondence to Majid Vaseghi.

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Hosseini Kahnooj, S.A., Vaseghi, M. & Sameezadeh, M. Softening and Microstructure Evolution of Pure Copper Disks Processed by High Pressure Torsion. Met. Mater. Int. 28, 2646–2651 (2022). https://doi.org/10.1007/s12540-022-01173-0

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