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Metal matrix composites (MMC) are an important engineering material used in automotive, space and aviation applications. In MMC, there are fabrication techniques such as solid state fabrication, liquid state fabrication, solid-liquid state fabrication. Among the MMC fabrication techniques, the most economical method is the stir casting. In this study, 7 vol. % and 10 vol. % SiC reinforced AA6060 matrix composite and AA6060 matrix was produced by squeeze assisted stir casting technique. The fabricated materials were examined metallographic and mechanical properties such as hardness density and porosity. As a result of the metallographic examinations, it has been found that the composites are partially homogeneous. It is observed that as the volume reinforcement ratio increases, the hardness and density increase.

International Symposium on Light Alloys and Composite Materials
UHAKS

İsmail Kayabaşı Gökhan Sur

Fonksiyonel derecelendirilmiş malzemeler (FDM'ler), farklı yapı veya bileşime sahip dereceli tabakalardan oluşan ileri mühendislik materyalleridir. Bu çalışmada, tabaka sayısı ve takviye miktarları farklı Al7075 alaşımlı FDM’lerin mikroyapı özellikleri deneysel olarak incelemiştir. Al7075/Al2O3 FDM’ler toz metalurji yöntemi ve sıcak presleme (450ºC, 325 MPa) işlemiyle üretilmiştir. Al7075/Al2O3 FDM’ler üç (ağr.% 60-40-20), dört (ağr.% 60-45-30-15) ve altı (ağr.% 60- 50-40-30-20-10) tabakadan oluşmuştur. Numunelerin mikroyapısal karakterizasyonu, taramalı elektron mikroskobu (SEM) kullanılarak yapılmıştır. Tabakalar arasında belirgin bir delaminasyon gözlenmemiştir. Al2O3 takviye partiküllerinin yapı içerisinde homojen olarak dağıldığı gözlenmiştir. Ancak artan Al2O3 miktarının gözenek miktarını ve topaklanmayı arttırdığı tespit edilmiştir. Functionally graded materials (FGMs) are advanced engineering materials composed of different graded layers which have several structure or composition. In this study, we report on experimental investigations of the influence of layer number and amount of reinforcement ceramics on microstructure of Al7075 metal matrix composite. Al7075/Al2O3 FGMs is produced by powder metallurgy method and hot pressing (450 º C, 325 MPa) process. Al7075/Al2O3 FGMs contain three (wt. %60-40-20), four (wt. %60-45-30-15) and six (wt. % 60-50-40-30-20-10 ) graded layers. Microstructural characterization of the samples were done using scanning of electron microscope (SEM). No obvious delamination was observed between the two graded layers. Al2O3 reinforcement particulates were uniformly distributed in the matrix structure. By increasing the content of Al2O3, the results showed that porosity and agglomeration were increased.

International Congress on 3D Printing (Additive Manufacturing) Technologies and Digital Industry
3D-PTC2019

Tuğçe Yıldız Gökhan Sur