بررسی رفتار تغییرشکل گرم و تحولات ریزساختاری در آلیاژ نزدیک آلفا Ti-8Al-1Mo-1V

نوع مقاله : مقاله پژوهشی

نویسندگان

• فاطمه زرقانی ¹
• غلامرضا ابراهیمی ²
• امیر مومنی ³
• حمید رضا عزت پور ⁴

¹ گروه مهندسی مواد، دانشگاه حکیم سبزواری، سبزوار، ایران

² گروه مهندسی متالورژی و مواد، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد.

³ گروه مهندسی مواد، دانشگاه همدان، همدان، ایران

⁴ گروه علوم مهندسی ، دانشگاه حکیم سبزواری، سبزوار، ایران

10.22067/jmme.2023.80724.1100

چکیده

آلیاژ تیتانیم نزدیک آلفا Ti-811به دلیل خواصی نظیر استحکام ویژه بالا، دانسیته پایین و مقاومت به خوردگی عالی در صنایع هوافضا، خودروسازی و نظامی کاربرد گسترده‌ای دارد. در این پژوهش نمونه‌های استوانه‌ای با ارتفاع و قطر به ترتیب 12 و 8 میلی‌متر با کمک وایرکات تهیه و برای آزمون فشار گرم به کارگرفته شد. رفتار سیلان آلیاژ Ti-811 با آزمایش فشار گرم در محدوده‌ای از دماها (950 ، 975، 1000، 1025، 1050و°C 1075) و نرخ‌کرنش‌ها (001/0 ، 01/0، 1/0 وs-11) تحت کرنش ثابت 6/0 مورد بررسی قرار گرفته است. منحنی سیلان نشان داد که نرمی سیلان پیوسته اتفاق می‌افتد؛ که میزان آن در ناحیه دوفازی، در مقایسه با ناحیه تک فازی بیشتر است. تصاویر ریزساختاری گرفته شده با میکروسکوپ نوری و تحلیل‌های مکانیکی نشان داد که مکانیسم های نرمی در ناحیه تک فاز بتا، تبلورمجدد دینامیکی فاز بتا و در ناحیه دو فازی آلفا+بتا رنج گسترده‌ای از تغییرات ریزساختاری نظیر تغییر فاز دینامیکی، کروی شدن و موجی شدن آلفای لایه‌ای است.

کلیدواژه‌ها

• آلیاژ نزدیک آلفا
• Ti-811
• تغییرشکل گرم
• تبلور مجدد دینامیکی
• کروی شدن

موضوعات

• شکل دادن فلزات

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عنوان مقاله [English]

Hot deformation characteristic and microstructural evolution of a near alpha alloy Ti-8Al-1Mo-1V

نویسندگان [English]

• fateme Zarghani ¹
• Gholamreza Ebrahimi ²
• Amir Momeni ³
• hamid reza Ezatpour ⁴

¹ Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran

² -Materials and Metallurgical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran

³ Materials Science and Engineering Department, Hamedan University of Technology, Hamedan, Iran

⁴ Department of Engineering Sciences, Hakim Sabzevari University, Sabzevar, Iran

چکیده [English]

Titanium alloy grade Ti–8Al-1Mo-1V (Ti-811) has been widely applied for many applications such as aerospace, automotive and military industries due to their high specific strength, low density, and excellent corrosion resistance. In this work, cylindrical specimens with a height of 12 mm and diameter of 8 mm were machined for the hot compression tests. the flow stress behavior of near-α alloy Ti-811 was investigated by hot compression testing under conditions of varying temperature (between 950, 975, 1000, 1025, 1050 and 1075 ◦C), strain rates ( 0.001, 0.01, 0.1 and 1s-1) and true strain up to 0. 6. The stress–strain curves of Ti-811 alloy revealed that the continuous flow softening occurs, anyway, the flow softening amount show greater flow softening in the two phase region as compared to the single phase region. Mechanical testing

and optical microscopy analyses indicate that dynamic recrystallization occurred, for single-phase β microstructure. However; a broad variety of microstructure formation mechanisms including allotropic phase transformations, platelet kinking and globularization occurred for two- phase α + β region.

کلیدواژه‌ها [English]

• Near- &alpha
• alloy Ti-811
• Hot compression
• Dynamic recrystallization
• globularization

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