بررسی نقش دوقلویی‌ها بر تغییرات بافت آلیاژ منیزیم AZ63 حین کار گرم
الموضوعات : فصلنامه علمی - پژوهشی مواد نوینمهدی کاویانی 1 , غلامرضا ابراهیمی 2
1 - دانشجوی کارشناسی ارشد، دانشکده فنی و مهندسی، دانشگاه حکیم سبزواری، سبزوار، ایران
2 - دانشیار، دانشکده فنی و مهندسی، دانشگاه حکیم سبزواری، سبزوار، ایران
الکلمات المفتاحية: آلیاژ منیزیم AZ63, بافت, دوقلویی, تبلور مجدد دینامیکی,
ملخص المقالة :
به منظور بررسی تاثیر بافت اولیه و پارامترهای ترمومکانیکی بر رفتار کار گرم آلیاژ منیزیم AZ63، رفتار سیلان ماده، بافت تغییر شکل حاصل از فشار گرم نمونه‌های ریختگی و نمونه‌های اکسترود شده با یکدیگر مقایسه شده است. نمونه‌های اکسترود شده در دو جهت اکسترود و جهت نرمال ماشین کاری شدند. آزمون‌های فشار گرم در دمای C° 250 و نرخ کرنش‌های s-1 1 و s-1 01/0 و کرنش‌های متفاوت انجام شدند. مشاهدات ریزساختاری و بررسی بافت‌ها در شرایط تغییر شکل متفاوت نشان دهنده این است که حضور دوقلویی‌های کششی و فشاری در نمونه‌های اکسترود شده و دوقلویی‌های کششی در نمونه‌های ریخته گری شده، تاثیر به سزایی در تغییرات بافت نمونه‌ها در کرنش‌های اولیه تغییر شکل و هم‌چنین تبلور مجدد در کرنش‌های پایانی نمونه‌های اکسترود شده داشته است.
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