مواد پیشرفته در مهندسی

مواد پیشرفته در مهندسی

تولید و مشخصه‌یابی ریزساختاری و خواص مکانیکی کامپوزیت هیبریدی لایه‌ای زمینه آلومینیومی شامل تقویت‌کننده‌های ذرات SiC و ذرات آمورف پایه آهن

نوع مقاله : مقاله پژوهشی

نویسندگان
محمدرضا رضائی
رضا ناظم‌نژاد
علیرضا سراوانی
دانشکده فنی و مهندسی، دانشگاه دامغان، دامغان، ایران
10.47176/jame.45.3.1168
چکیده
مقدمه و اهداف: یکی از روش‌های بهبود خواص مکانیکی کامپوزیت‌های زمینه فلزی، ایجاد ساختار ناهمگن لایه‌ای در آن‌ها است. براین اساس، این پژوهش با هدف توسعه کامپوزیت زمینه آلومینیومی با ساختار لایه‌ای حاوی تقویت‌کننده‌های هیبریدی ذرات سرامیکی SiC و ذرات آمورف پایه آهن و بررسی خواص مکانیکی آن انجام شد.
مواد و روش‌ها: ساختار ناهمگن متشکل از لایه‌های متناوب آلومینیوم خالص و کامپوزیت با ضخامت‌های مختلف ازطریق روش متالورژی پودر و به‌کارگیری روش تف‌جوشی به‌کمک قوس پلاسما ایجاد شد. ویژگی‌های ریزساختاری و فازی کامپوزیت‌های تولیدی توسط میکروسکوپ الکترونی، میکروسکوپ نوری و پراش پرتو ایکس مورد بررسی قرار گرفت و ارتباط آن‌ها با خواص مکانیکی مشخص شد.
یافته‌ها: مطالعات ریزساختاری شامل بررسی مقدار تخلخل به‌همراه نتایج چگالی‌سنجی، نشان از بهبود رفتار چگالش کامپوزیت‌های لایه‌ای حین فرایند تف‌جوشی با افزایش ضخامت لایه آلومینیوم خالص داشت. همچنین، توزیع ذرات تقویت‌کننده با افزایش کسر حجمی لایه آلومینیوم خالص نسبت به لایه کامپوزیتی بهبود یافت. یافته‌های مربوط به تغییرات فازی در تمام نمونه‌های تف‌جوشی‌شده، نمایانگر عدم تغییر ماهیت ذرات تقویت‌کننده و همچنین عدم تشکیل محصولات شیمیایی در مرز مشترک ذرات تقویت‌کننده و زمینه حین عملیات تف‌جوشی بود. خواص مکانیکی کامپوزیت حاصل نشان از استحکام و انعطاف‌پذیری بالای کامپوزیت‌های تولیدی داشت به‌نحوی که استحکام فشاری 191 MPa و کرنش شکست 20 درصد برای نمونه دارای کسر حجمی بالاتر از لایه کامپوزیتی به‌دست آمد.
نتیجه‌گیری: ایجاد ساختار لایه‌ای در کامپوزیت هیبریدی با تغییر رفتار چگالش و توزیع ذرات تقویت‌کننده، موجب بهبود خواص مکانیکی در مقایسه با کامپوزیت همگن شد.
کلیدواژه‌ها
کامپوزیت هیبریدی
متالورژی پودر
ساختار لایه‌ای
ریزساختار
خواص مکانیکی
موضوعات

عنوان مقاله English

Synthesis, Microstructural Characterization, and Mechanical Properties of a Layered Hybrid Aluminum-Matrix Composite Containing SiC Reinforcements and Iron-Based Amorphous Particles

نویسندگان English

Mohammad Reza Rezaei
Reza Nazemnezhad
Alireza Saravani
School of Engineering, Damghan University, Damghan, Iran
چکیده English

Introduction and Objectives: One effective approach for enhancing the mechanical properties of metal matrix composites is the design of architected layered heterogeneous structures. Hence, the present study aimed to develop aluminum matrix hybrid composites reinforced with SiC ceramic particles and iron-based amorphous particles, featuring a heterogeneous layered architecture and to investigate their mechanical properties.
Materials and Methods: The heterogeneous structure comprised alternating layers of pure aluminum and composite material with varying thicknesses, fabricated via powder metallurgy using spark plasma sintering (SPS). The microstructural and phase characteristics of the composites were investigated using scanning electron microscopy (SEM), optical microscopy (OM), and X-ray diffraction (XRD). The relationship between microstructure and mechanical properties was subsequently analyzed.
Results: Microstructural analyses, including porosity evaluation and density measurements, demonstrated enhanced densification during sintering with increasing pure aluminum layer thickness. In addition, the distribution of reinforcement particles was improved by increasing the volume fraction of the pure aluminum layers relative to the composite layers. Phase analysis of all sintered samples confirmed the preservation of the amorphous nature of the iron-based reinforcement particles and revealed no evidence of interfacial reaction products at the reinforcement–matrix interfaces. Mechanical experiments showed a favorable combination of high strength and ductility, with a compressive strength of up to 191 MPa and a fracture strain of 20% in samples with a higher volume fraction of composite layers. Furthermore, increased ductility was observed with a higher volume fraction of pure aluminum layers.
Conclusion: The introduction of a layered heterogeneous architecture in the hybrid composite, through modification of consolidation behavior and reinforcement particle distribution, resulted in superior mechanical properties compared to those of the homogeneous composite.

کلیدواژه‌ها English

Hybrid composite
Powder metallurgy
Layered structure
Microstructure
Mechanical properties
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مواد پیشرفته در مهندسی
دوره 45، شماره 3
(شماره پیاپی 54)
پاییز 1405
صفحه 53-68

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