تاثیر عملیات حرارتی پیرسختی و فرآیند اکستروژن بر خواص مکانیکی آلیاژ Al-3Mg-2.5Cu-xEr

نوع مقاله : علمی و پژوهشی

نویسنده

• محمد علی پور

مهندسی مواد، دانشکده مکانیک، گروه مهندسی مواد، دانشگاه تبریز. ایران.

10.22067/jmme.2023.82403.1109

چکیده

در این مقاله، اثر جوانه زای Al-30Er، عملیات حرارتی و فرآیند اکستروژن بروی آلیاژ آلومینیوم Al-3Mg-2.5Cu مورد بررسی قرار گرفت. آمیژان نادر خاکی Al-30Er در درصدهای 0.5، 1، 1.5 و 2 ایربیوم به مذاب در دمای 750 درجه سانتیگراد افزوزده شد. مقدار بهینه ی Er برابر یک درصد وزنی به دست آمد. مطالعات ریزساختاری و شکست نگاری با میکروسکوپ الکترونی روبشی مجهز به طیف سنجی پراش اشعه ایکس انجام شد. عملیات حرارتی T6 شامل همگن سازی، کوئنچ سریع تا دمای اتاق و پیرسازی در دمای 120 C به مدت 24 ساعت، برای دست یابی به استحکام بیشینه صورت گرفت. جهت از بین بردن تخلخل داخل نمونه ها و بهبود استحکام نمونه ها از فرآیند اکستروژن با نسبت 6 به 1 استفاده شد. برای نمونه های اولیه جهت اکستروژن قطر استوانه اولیه 29 میلی متر می باشد. با افزودن جوانه زا و اعمال عملیات حرارتی T6 و فرایند اکستروژن، بهبود قابل توجهی در خواص مکانیکی حاصل شد. میانگین استحکام کششی نهایی (UTS) نمونه ها قبل و بعد از عملیات حرارتی T6 و فرایند اکستروژن از 225 MPa تا 602 MPa افزایش یافت. افزودن یک درصد وزنی Er، اعمال عملیات حرارتی و فرایند اکستروژن، باعث ایجاد 167% بهبود در استحکام کششی در مقایسه با آلیاژ آلومینیوم پایه گردید.

کلیدواژه‌ها

• نادر خاکی
• عملیات حرارتی
• خواص مکانیکی
• ریزساختار

موضوعات

• ریخته گری و انجماد

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عنوان مقاله [English]

Effect of aging heat treatment and extrusion process on mechanical properties of Al-3Mg-2.5Cu-xEr alloy

نویسنده [English]

• Mohammad Alipour

Faculty of Mechanical engineering, Department of Materials Engineering, University of Tabriz, Iran

چکیده [English]

In this study, the effect of Al-30Er grain refiners, extrusion and heat treatment conditions on an Al-3Mg-2.5Cu aluminum alloy was studied. Different amounts of Al-30Er (0.5 wt.% Er, 1 wt..0% Er, 1.5 wt.% Er and 2 wt.% Er) were added to the molten alloy at 750 ◦C. The optimum level of Er was found to be 1 wt.%. Microstructural examinations and fracture surfaces were conducted by scanning electron microscopy coupled with an energy dispersive spectrometry. T6 heat treatment including quenching to room temperature and aging at 120 C for 24 h was employed to reach to the maximum strength. In order to eliminate the porosity inside the samples and improve the strength of the samples, the extrusion process was used with a ratio of 6 to 1. For the prototypes in the direction of extrusion, the diameter of the primary cylinder is 29 mm. By adding grain refiners and applying T6 heat treatment and extrusion process, a significant improvement in mechanical properties was achieved. The average ultimate tensile strength (UTS) of the samples before and after T6 heat treatment and extrusion process increased from 225 MPa to 602 MPa. Addition of one percent by weight of Er, applying heat treatment and extrusion process, caused a 167% improvement in tensile strength compared to the base aluminum alloy.

کلیدواژه‌ها [English]

• Rare earth
• Heat treatments
• Mechanical Properties
• Microstructure

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