تاثیر پارامتر های ترمومکانیکی بر رفتار بافت آلیاژ منیزیم AZ63
محورهای موضوعی : فرآیندهای شکل دهی فلزات و ترمومکانیکال
غلامرضا ابراهیمی
1
(مغاون آموزشی و پژوهشی-دانشگاه فناوری نوین سبزوار)
مهدی کاویانی
2
(دانشجو-دانشگاه حکیم سبزواری)
کلید واژه: بافت, آلیاژ منیزیم AZ63, دوقلویی, تبلور مجدد دینامیکی,
چکیده مقاله :
به منظور بررسی تاثیر پارامتر های ترمومکانیکی بر رفتار بافت آلیاژ منیزیم AZ63، آزمون فشار گرم بر روی نمونه های اکسترود شده آلیاژ منیزیم AZ63 انجام شد. ابتدا نمونه ها در دو جهت اکسترود و جهت نرمال ماشین کاری شدند. سپس آزمون فشار گرم در دمای °C 250 و نرخ کرنش های s-1 01/0 و s-1 1 و کرنش های مختلف انجام شد. بررسی های ریزساختاری و تغییرات بافت نشان می دهد که در کرنش های اولیه تغییر شکل فشار گرم، در نمونه های جهت اکسترود دوقلویی های کششی منجر به تقویت بافت قاعده در جهت نورد و دوقلویی های فشاری در نمونه های جهت نرمال باعث تغییر بافت به سمت جهت عرضی می شوند. همچنین با توجه به تغییرات بافت توسط تصاویر قطبی مشخص شده است که در کرنش های بالا در نمونه های جهت نرمال، تبلور مجدد دینامیکی منجر به کاهش شدت بافت قاعده شده است.
Hot compression test was carried out on extruded AZ63 magnesium alloy samples to investigation of the effect of thermomechanical parameters on AZ63 magnesium alloy texture behavior. At first, samples have been machined on two extruded direction (ED) and normal direction (ND). Then, hot compression test performed at 250 °C and strain rates of 0.01 s-1 and 1 s-1 and various strain. Microstructural investigation and texture evolution reveal that tensile twinning leading to basal texture improvement in roll direction (RD=ED) and compressive twinning causes changing texture align transverse direction (TD) at primarily strain during hot compression test. Also, observation of Texture evolution by pole figures indicate that dynamic recrystallization reduces basal texture intensity in ND samples at high strains.
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