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مطالعه و بررسی بهبود ریزساختار و خواص مکانیکی آلیاژهای منیزیم پس از فرایند اکستروژن پیچشی تحت فشار بالا | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 4، دوره 56، شماره 12، 1403، صفحه 1643-1662 اصل مقاله (1.55 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2025.23670.7798 | ||
| نویسندگان | ||
| فرشاد اکبری پناه* ؛ بهنام خاکی پور | ||
| دانشکده فنی و مهندسی، دانشگاه ملایر، ملایر، ایران | ||
| چکیده | ||
| این پژوهش به بررسی تأثیر فرآیند اکستروژن پیچشی تحت فشار بالا، به عنوان یکی از روش‌های تغییر شکل پلاستیک شدید، بر خواص مکانیکی و ریزساختار آلیاژهای AZ80 و ZK30 پرداخته است و با ایجاد کرنش‌های بالا، موجب بهبود ریزساختار و خواص مکانیکی نمونه‌ها شده است. ابتدا، آلیاژها با ریخته‌گری دورانی تولید و سپس در دمای اتاق تحت اکستروژن پیچشی فشار بالا قرار گرفتند. آزمون‌های پانچ برشی و سختی‌سنجی ویکرز برای بررسی خواص مکانیکی انجام شد و ساختار نمونه‌ها با پراش الکترون‌های بازگشتی بررسی شد. میانگین اندازه دانه برای آلیاژAZ80 از مقدار اولیه 5/10 به مقدار μm 2/40، μm 3/52 و μm 3/33 به ترتیب برای حالت‌‌های v8ω0.6، v5ω1و v1ω1 تغییر یافت و برای آلیاژ ZK30 از مقدار اولیه μm 30/87 به µm6/51 در حالتv6ω0.6 کاهش یافته است. استحکام برش نهایی آلیاژAZ80 در نمونه اکسترود شده MPa157/65 و تحت فرآیند اکستروژن پیچشی فشار بالا در حالت v8ω0.6 به MPa183/63 می‌رسد و هرچه نسبت ω/v افزایش یابد، مقداراستحکام برش نهایی کاهش می‌یابد. برای آلیاژZK30 در نمونه اکسترود شده MPa147/95و تحت فرآیند اکستروژن پیچشی فشار بالا در حالت v6ω0.6 بهMPa 176/33 می‌رسد که %20 افزایش یافته است. باتوجه به نتایج، استحکام برش نهایی نمونه‌ها پس از فرآیند اکستروژن پیچشی فشار بالا افزایش یافته و موجب بهبود خواص مکانیکی آلیاژها شده است که دلیل این امر ریزتر شدن اندازه دانه تحت فرآیند اکستروژن پیچشی فشار بالا است. | ||
| کلیدواژه‌ها | ||
| تحولات ریز ساختاری؛ اکستروژن پیچشی فشار بالا؛ آزمون پانچ برشی؛ تغییر شکل پلاستیک شدید؛ آلیاژ AZ80 و ZK30 | ||
| عنوان مقاله [English] | ||
| Microstructural evolution and mechanical properties of Mg alloys after processing by HPTE technique | ||
| نویسندگان [English] | ||
| Farshad Akbaripanah؛ Behnam Khakipour | ||
| Mechanical Engineering Department, Malayer University, Malayer, Iran | ||
| چکیده [English] | ||
| This study investigates the effect of high-pressure torsion extrusion (HPTE) as a severe plastic deformation method on the mechanical properties and microstructure of AZ80 and ZK30 alloys. By inducing high strains, HPTE significantly improves the microstructure and mechanical properties of the samples. The alloys were initially produced by centrifugal casting and then subjected to HPTE at room temperature. Shear punch tests and Vickers hardness tests were conducted to assess mechanical properties, and the structure of the samples was examined using electron backscatter diffraction (EBSD). The average grain size of AZ80 alloy decreased from an initial value of 5.10 μm to 2.40 μm, 3.52 μm, and 3.33 μm for the v8ω0.6, v5ω1, and v1ω1 conditions, respectively. For ZK30 alloy, the grain size reduced from 30.87 μm to 6.51 μm under the v6ω0.6 condition. The final shear strength of AZ80 alloy in the extruded sample was 157 MPa, and under HPTE at the v8ω0.6 condition, it increased to 183 MPa. As the ω/v ratio increased, shear strength decreased. For ZK30 alloy, the shear strength in the extruded sample was 147 MPa, and under HPTE at the v6ω0.6 condition, it increased to 176 MPa, showing a 20% improvement. The results indicate that HPTE improves the mechanical properties of both alloys due to grain refinement during the process. | ||
| کلیدواژه‌ها [English] | ||
| Microstructural Evolution, High-Pressure Torsional Extrusion, Shear Punch Test, Severe Plastic Deformation, AZ80 and ZK30 Alloys | ||
| مراجع | ||
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