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Iranian Journal of Materials Science and Engineering، جلد ۱۴، شماره ۲، صفحات ۳۲-۴۰
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چکیده فارسی مقاله
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عنوان انگلیسی MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE ULTRAFINE-GRAINED COPPER TUBE PRODUCED BY SEVERE PLASTIC DEFORMATION
چکیده انگلیسی مقاله In this paper, cyclic flaring and sinking (CFS) as a new severe plastic deformation (SPD) method was employed to produce the ultrafine grain (UFG) copper tubes. The extra friction has eliminated in the CFS method that provided the possibility for production of longer UFG tubes compared to the other SPD methods. This process was done periodically to apply more strain and consequently finer grain size and better mechanical properties. The CFS was performed successfully on pure copper tubes up to eleven cycles. Mechanical properties of the initial and processed tubes were extracted from tensile tests in the different cycles. The remarkable increase in strength and decrease in ductility take placed in the CFS-ed tubes. The material flow behavior during CFS processing was analyzed by optical microscopy (OM), and a model was presented for grain refinement mechanism of pure copper based on multiplication and migration of dislocations (MMD). This mechanism caused that the initial grains converts to elongated dislocation cells (subgrains) and then to equiaxed ultrafine grains in the higher cycles. The CFS method refined the microstructure to fine grains with the mean grain size of 1200nm from initial coarse grain size of 40µm
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نویسندگان مقاله h تراب زاده کاشی | h torabzadeh kashi
department of mechanical engineering, university college of engineering, university of tehran, tehran, iran. p.o.b. 11155-4563

سازمان اصلی تایید شده: دانشگاه تهران (Tehran university)

m بهرامی | m. bahrami
department of mechanical engineering, university college of engineering, university of tehran, tehran, iran. p.o.b. 11155-4563

سازمان اصلی تایید شده: دانشگاه تهران (Tehran university)

j شهبازی کرمی | j shahbazi karami
faculty of mechanical engineering, shahid rajaee teacher training university, lavizan, tehran, iran

سازمان اصلی تایید شده: دانشگاه تربیت دبیر شهید رجایی (Shahid rajaee teacher training university)

gh فرجی | gh. faraji
department of mechanical engineering, university college of engineering, university of tehran, tehran, iran. p.o.b. 11155-4563

سازمان اصلی تایید شده: دانشگاه تهران (Tehran university)

نشانی اینترنتی http://ijmse.iust.ac.ir/browse.php?a_code=A-10-1182-1&slc_lang=en&sid=en
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/454/article-454-449913.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده گروه مکانیکی و شکل دادن
نوع مقاله منتشر شده Research paper
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