Toz Metalurjisi Yöntemiyle Üretilen Aluminyum-7xxx Serisi Alaşımlarının Fiziksel Özellikleri

Alumix-431 malzemeleri; oda sıcaklığında (RT) ve 50,80°C sıcaklıklarında 350-400MPa basınç uygulayarak soğuk ve sıcak presleme yöntemiyle hazırlanmıştır. Malzemelerin yoğunluk ölçümleri yapılmıştır ve termoelektrik ölçümleri He atmosferi altında 5-300K sıcalık aralığında gerçekleştirilmiştir. Termoelektrik ölçümlerinde sonuçlar maksimum elektriksel öz direnç ve maksimum termal öz iletkenlik sırasıyla 285-295K sıcaklık aralığında Alumix-431-1 malzemesinde 0.161Ωm ve Alumix-431-6 malzemesinde 24.31W/Km olarak kaydedilmiştir. Minimum elektriksel öz direnç ve termal öz iletkenlik sırasıyla Alumix-431-6 ve Alumix-431- 1 malzemelerinde elde edilmiştir. Seebeck katsayısı taşıyıcıların yoğunluğuna bağlı olarak pozitif değerden negative değere değişim göstermiştir. Maksimum performans katsayısı Alumix-431-1 alaşımında 96.904K sıcaklığında 1.871×10 -2 olarak saptanmıştır.

The Physical Properties Of Aluminium-7xxx Series Alloys Produced By Powder Metallurgy Method

Alumix-431 materialswere prepared by cold and warm compaction method applying 350-400 MPa pressures at RT (room temperature) 50 and 80°C temperatures. The density measurements of materials were performed; the thermoelectric properties of materials were investigated at 5-300K under the He atmosphere, and the relationship between the measurements and sample properties was examined. The measurements of thermoelectric properties showed that maximum resistivity [Alumix -431-1] and thermal conductivity [Alumix -431-6] values were obtained 0.161Ωm and 24.31W/Km, respectively at 285-295K temperature ranges and minimum electrical resistivity and thermal conductivity values were obtained on Alumix-431-6 and Alumix-431-1 samples, respectively. It was observed that Seebeck coefficient values varied mostly from negative sign to positive sign indicated dominate from carriers. The maximum Figure of merit value was determined as 18.71×10-2; on the Alumix-431-5 alloy at 96.904K

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