Nanokil ile Takviye Edilmiş Mg Kompozitlerin Mikroyapılarının Sertliklerinin ve Yoğunluklarının Araştırılması

Year 2025, , 471 - 478, 30.01.2025

Mikail Aslan

https://doi.org/10.29130/dubited.1525745

Abstract

Magnezyum (Mg), mühendislikte yaygın bir malzeme olarak öne çıkmakta ve düşük yoğunluk, sertlik, yüksek sönüm kapasitesi, üstün eğilme direnci ve etkileyici spesifik mukavemet gibi benzersiz kombinasyonu nedeniyle biyomalzeme olarak hayati bir işlev görmektedir. Yüksek reaktivitesine ve zorlu mühendislik uygulamaları için mekanik özelliklerinin yetersiz olmasına rağmen, güçlendirici nanoparçacıkların eklenmesi, magnezyum bazlı kompozitlerin performansını artırma potansiyeli göstermiştir. Bu çalışma, toz metalurjisi yaklaşımı kullanılarak nanokil ile güçlendirilmiş magnezyum kompozitlerinin mikro yapı değerlendirmesi, sertlik ve yoğunluğunu araştırmaktadır. Nanokil, ağırlık yüzdeleri olarak %1, %3, %5 ve %7 oranlarında bir güçlendirme elemanı olarak tercih edilmiştir. Kompozitlerin yoğunlukları, Archimedes prensibi kullanılarak ölçülmüştür ve nanokilin eklenmesinin genellikle kompozitlerin yoğunluğunu artırdığı, çünkü nanokilin saf magnezyumdan daha yüksek bir yoğunluğa sahip olduğu görülmüştür. Ancak, %5 nanokil içeren kompozit, %3 nanokil içeren kompozitten daha düşük yoğunluk göstermiştir, bu durum aglomerasyonların iç boşlukları artırması ile ilişkilendirilebilir. Vickers sertlik testi için, numune 600, 1000 ve 2000 mesh zımpara ile zımparalandı ve ardından 6μ ve 3μ elmas süspansiyonları ile parlatıldı. AOB Vickers Mikrosertlik testi kullanılarak yapılan sertlik ölçümleri, en yüksek sertlik değerinin %7 ağırlık yüzdesine sahip nanokil içeren kompozitte gözlemlendiğini ve nanokil eklemenin sertliği artırdığını göstermiştir. Ancak, %3 nanokil içeren kompozit diğer güçlendirilmiş kompozitlere göre daha düşük sertlik göstermiştir. Yapıların optik görüntüleri, kontaminasyonu belirten metalografik noktaları ortaya çıkarmıştır. Bu bulgular, nanokil ile güçlendirilmiş magnezyum kompozitlerinin yapısal ve mekanik davranışlarının anlaşılmasına katkıda bulunur ve bu tür malzemelerin otomotiv, havacılık ve tıp alanlarındaki çeşitli uygulamalar için optimize edilme potansiyelini gösterir.

Keywords

Nanokil, Mg kompozit, Sertlik, Mikroyapı ve yoğunluk

The Microstructure, Hardness and Density Investigation of Mg Composites Reinforced with Nanoclay

Abstract

Magnesium (Mg) stands out as a prevalent material in engineering, finding essential utility as a biomaterial due to its unique combination of low density, stiffness, high damping capacity, superior bending resistance, and impressive specific strength. Despite its high reactivity and somewhat inadequate mechanical properties for rigorous engineering applications, the incorporation of reinforcing nanoparticles has shown significant potential in enhancing the performance of magnesium-based composites. This study investigates the microstructure evaluation, hardness, and density of magnesium composites reinforced with nanoclay using a powder metallurgy approach. Nanoclay was preferred as a reinforcement element at weight percentages of 1%, 3%, 5%, and 7%. The densities of the composites were measured using the Archimedean principle, revealing that the addition of nanoclay generally increases the density of the composites due to the higher density of nanoclay compared to pure magnesium. However, the composite with 5% nanoclay exhibited a lower density than the one with 3% nanoclay, likely due to agglomerations leading to increased internal voids. Surface preparation for Vickers hardness testing involved sanding with 600, 1000, and 2000 mesh sanders, followed by polishing with 6μ and 3μ diamond suspensions. Hardness measurements, conducted using an AOB Vickers microhardness tester, indicated that the highest hardness value was observed in the composite with a 7% weight percentage of nanoclay, demonstrating that nanoclay addition enhances hardness. However, the composite with 3% nanoclay showed lower hardness compared to other reinforced composites. Optical images of the structures revealed metallographic spots indicative of contamination. These findings contribute to the understanding of the structural and mechanical behavior of nanoclay-reinforced magnesium composites, highlighting the potential for optimizing such materials for various applications in automotive, aerospace, and medical fields.

Keywords

Nanoclay, Mg composites, Hardness, Microstructure and density measurement

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