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- 저자 : Seyed Amin Hosseini Kahnooj (검색결과 1 건)
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Softening and Microstructure Evolution of Pure Copper Disks Processed by High Pressure Torsion
Seyed Amin Hosseini Kahnooj,Majid Vaseghi,Mahmood Sameezadeh 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.11
In this study after designing and manufacturing HPT’s anvils, copper disks with more than 99.99% purity were processedby HPT at two selected pressures for various turns. The results showed that the softening of Cu processed disks occurs veryquickly. Also, the softening range expanded from near the edge to near the center of processed disks, and this range was moreexpanded by increasing turns and pressure. The uniformity of hardness along the radius of the processed disk was obtainedat a pressure of 1.25 GPa for 2 turns. Microhardness-equivalent strain plots showed a maximum pick at the strain of 2–3 andthen it reached a steady-state at the equivalent strain of 5–6. Mean crystallite size and dislocation density were calculatedusing the Rietveld refinement method from XRD patterns. The results illustrated mean crystallite size and dislocation densitydue to recrystallization and recovery decreased by increasing pressure and turn. These results could help long-time applicationsof copper processed by SPD processes that are unusable due to long-time softening.
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