GRAFEN NANO PLAKALARLA TAKVİYE EDİLMİŞ Al-5,5Cu-0,5Mn MATRİSLİ KOMPOZİTLERİN TOZ METALURJİSİ İLE ÜRETİMİ VE KARAKTERİZASYONU

Bu çalışmada, grafen nano plakalar (GNP) ile takviye edilmiş Al-ağ.%5,5 Cu-ağ.%0,5 Mn matrisli kompozitler toz metalurjisi yöntemi ile üretilmiştir. Başlangıç tozlarının 8 saate kadar mekanik alaşımlanması ile üretilen Al-5,5Cu-0,5Mn-xGNP (x: ağ.% 0, 0,5 1 ve 2) kompozit tozları, 650 MPa altında ön şekilldendirilmiş ve takiben 600 °C’de 2 saat Ar atmosferi altında basınçsız olarak sinterlenmiştir. Üretilen Al-5,5Cu-0,5Mn-xGNP kompozit numunelerinin mikroyapısal, mekanik ve korozyon özelliklerinin belirlenmesi için X-ışınları difraksiyonu (XRD), taramalı elektron mikroskobu-enerji dağılım spektrometresi (SEM-EDS), mikrosertlik ve korozyon testleri yapılmıştır. Üretilen Al-5,5Cu-0,5Mn-xGNP kompozitlerinin mikroyapısında Al2Cu intermetalik fazı tespit edilmiş ve mekanik alaşımlanmış numunelerde karbür fazı oluşumuna rastlanmıştır. Optimum mekanik alaşımlama süresi 4 saat olarak belirlenmiş ve bu numunelerde grafen katkısı ile sertlik değerlerinin artarak Al-5,5Cu-0,5Mn-2GNP kompozit numunesi için 123 HV’e ulaştığı belirlenmiştir. Ayrıca, grafen katkısının Al esaslı matrisin korozyon direncini düşürdüğü belirlenmiştir.

Powder Metallurgical Fabrication and Characterization of Graphene Nano Platelets Reinforced Al5.5Cu-0.5Mn Matrix Composites

In this study, graphene nano platelets (GNPs) reinforced Al-5.5wt.%Cu-0.5wt.%Mn matrix composites were produced by the powder metallurgy method. Al-5.5Cu-0.5Mn-xGNP (x: 0, 0,5 1 ve 2 wt.%) composite powders produced by mechanical alloying of the starting powders up to 8 h were precompacted via uniaxial pressing under 650 MPa and subsequently pressurelessly sintered at 600 °C for 2 hours under Ar atmosphere. The microstructural, mechanical and corrosion properties of Al-5.5Cu-0.5Mn-xGNP composites were investigated via X-ray diffractometer (XRD), scanning electron microscope-energy dispersive spectrometer (SEM-EDS), microhardness and corrosion tests, respectively. Al2Cu intermetallic phase was detected in the microstructure of the composites and carbide phase formation was observed in the mechanically alloyed composites. The optimum mechanical alloying duration was determined as 4 hours and it was observed that the hardness of these composites increased by the increasing graphene amount and reached to 123 HV for Al-5.5Cu-0.5Mn-2GNP sample. Moreover, the corrosion resistance of Al-based matrix worsened by the graphene addition.

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