Ugur AYBARC, Tugce Busra YUKSEL, Onur ERTUGRUL

Al A356 Matris Kompozitlerin Ultrasonik Destekli Karıştırmalı Döküm ile Üretiminde Karıştırma Süresi ve Döküm Sıcaklığının Etkileri

Bu çalışmada, karıştırma işleminin kompozit malzemelerin mekanik özellikleri üzerindeki etkisinin belirlenmesi için karıştırma süresi ve erimiş metal sıcaklığı gibi iki temel parametre göz önünde bulundurulmuştur. Kompozit numune üretiminde, AlSi7Mg0.3 alüminyum alaşımı matris malzemesi olarak silisyum karbür (SiC) parçacıkları ise takviye malzemesi olarak kullanılmıştır. İlk aşamada, mekanik karıştırma ve ultrasonik titreşimli karıştırma işlemleri çeşitli süreler için faklı kombinasyonlarda 3-1, 2-2 ve 1- 3 dakika olarak uygulanmıştır. Karıştırma işleminin etkisini belirlemek için tüm numunelere çekme testleri uygulanmış ve çekme testi sonuçları kullanılarak Kalite İndeksleri (Kİ) hesaplanmıştır. Kalite İndeksi sonuçlarına göre, 1 dakikalık mekanik karıştırma ve 3 dakikalık ultrasonik titreşim kombinasyonu ile üretilen örnekler maksimum mekanik özellikleri göstermiştir. Daha sonra, tespit edilen karıştırma kombinasyonu uygun erimiş metal sıcaklığını belirtmek için seçildi. Üç farklı döküm sıcaklığı 700˚C, 720˚C ve 740˚C olarak ele alınmıştır. Mekanik testler ve Kİ hesaplamaları ve metalografik inceleme sonuçlarına göre, maksimum mekanik özellikler 1 dakika mekanik karıştırma ve 3 dakika ultrasonik titreşim uygulanan 720˚C döküm sıcaklığında ağırlıkça %1 SiC katkılı alüminyum kompozit ile elde edilmiştir.

Effects of stirring duration and casting temperature in ultrasonic assisted stir casting of Al A356 matrix composites

In the present study, two main parameters as stirring duration and casting temperature were taken into consideration in order todetermine the effect of stirring process on mechanical properties of aluminum matrix composites. AlSi7Mg0.3 aluminum alloy andsilicon carbide (SiC) particles were used as matrix and reinforcement materials to produce composite samples. Firstly, stirringprocesses were applied as the combination of mechanical stirring and ultrasonic vibration for the various time as 3-1, 2-2 and 1-3minutes, respectively. To determine the effect of stirring process, tensile tests were applied to whole samples and Quality Indexes(QI) were calculated by using the results of tensile tests. According to the values of QI, the produced samples with the combinationof 1 minute mechanical stirring and 3 minutes ultrasonic vibration showed the maximum mechanical properties. Afterwards, thedetermined stirring combination was chosen to specify the appropriate molten metal temperature. Three different castingtemperatures were addressed as 700˚C, 720˚C and 740˚C. According to mechanical tests results and calculations of QI andmetallographic analysis, the maximum mechanical properties were obtained with aluminum composite reinforced with 1 wt. %SiC at 720˚C molten metal temperature by applying 1 minute mechanical stirring and 3 minutes ultrasonic vibration.

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