Al/Al-B4C Dairesel Hibrit Kompozitlerin Mekanik Özelliklerinin İncelenmesi

Öz

Hibrit kompozitler, iki farklı kompozit yapının birleştirilmesiyle elde edilen malzeme türleridir. Bu çalışma, alüminyum kılıf ve metal matrisli kompozit öz (Al-Seramik karışım) ile dairesel bir şekilde üretilen hibrit bir kompozit malzemenin mekanik özelliklerinin araştırılmasına odaklanmıştır. Mekanik özellikler, basma, eğilme ve sertlik testleri ile belirlenmiştir. Seramik takviye, metal matrisli kompozitlerin (MMK) temel mekanik özelliklerini iyileştirir. Ancak şekil değiştirme kabiliyeti gibi bazı özellikler olumsuz etkilenir. MMK malzemeyi kılıflı olarak üreterek bu özelliklerin iyileştirilmesi amaçlanmıştır. Bu hibrit malzemede kılıf malzemesi olarak Al7075 ve öz malzemesi olarak Al2124-B4C MMK malzeme kullanılmıştır. PIT (tüp içinde toz) yöntemiyle hazırlanan biletlerin ekstrüde edilmesiyle kompozit çubuklar üretilmiştir. Bu yöntemle toz halindeki öz malzeme, Al tüp malzemelerin içine sıkıştırılmıştır. Öz malzemesinde hacimce %5, %10 ve %15 olmak üzere üç farklı oranda B4C kullanılmıştır. Ekstrüzyon işlemi 500 °C derecede ve R=14 ekstrüzyon oranında gerçekleştirilmiştir. Test sonuçlarına göre, kılıf ile üretilen malzemelerde B4C takviyesi ile azalan şekil değiştirme kabiliyetinde iyileşme görülmüştür.

Anahtar Kelimeler

• Dairesel hibrit kompozit
• Ekstrüzyon
• B4C
• Tüp içinde toz
• MMK

Investigation of mechanical properties of Al/Al-B4C circular hybrid composites

Öz

Hybrid composites are material types obtained by combining two different composite structures. In this study, the mechanical properties of the circular hybrid composite materials which was produced in the form of rod with aluminum sheath and metal matrix composite core (Al-Ceramic mixture) were investigated under compression and bending loads. Although some mechanical properties of metal matrix composites (MMC) are improved with ceramic reinforcement, some of their properties as deformation ability is reduced. It was aimed to increase them by forming aluminum sheath on the outside of these materials. Al7075 aluminum alloy was used as sheath material while Al2124 alloy and B4C were used as core material. Extrusion process was used to produce the composite rods. The extrusion billets were produced with PIT (powder in tube) method. In this method, Al2124-B4C powder mixture was compressed in Al7075 tubes. Al2124-B4C powder mixture was prepared volumetrically at three different ratios (% 5, % 10 and % 15). The extrusion operation was realized at constant temperature (500 °C) and constant extrusion rate (R=14) and the composite rods produced in 8 mm diameter. The composite bars produced with and without sheaths were subjected to compression and three-point bending tests. According to the test results, with increasing of the B4C ratio in MMC bars, the deformation rate decreased rapidly. In the composites produced as hybrid, it was seen that the deformation ability increased and this showed that the aluminum sheath provided the desired improvement.

Anahtar Kelimeler

• Circular hybrid composite
• MMC
• Extrusion
• B4C
• Powder in tube (PIT)

Kaynakça

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