Teknolojinin hızla gelişmesi ile birlikte, imalat, havacılık ve otomotiv sektörlerinde yaygın olarak kullanılan standart malzemeler yerini yeni nesil yüksek mukavemete ve hafifliğe sahip malzemelere bırakmaktadır. Özellikle, Tungsten karbür (WC) ve Grafenin sahip olduğu yüksek termal ve elektriksel özellikler, yüksek elastisite modülü, yüksek mukavemet gibi üstün özellikleri sayesinde alüminyum matrisli kompozit malzeme üretiminde büyük etki ve avantajlara sahiptir. Bu çalışmada, WC ve Grafen takviyelerinin alüminyum matrisli kompozit malzemelerin mekanik özelliklerine etkisi ile ilgili çalışmalar incelenerek sunulmuştur. Alüminyum matrisli kompozitlerin mekanik özelliklerinin iyileştirilmesinde %20'ye kadar WC ve %0.7'ye kadar grafen katkısının etkili olduğu raporlanmıştır. Grafen ilavesinin %0.5'ten fazla arttırılması topaklanmalara, WC ilavesinin %30'dan fazla arttırılması ise gözenekliğin artmasına ve mekanik özelliklerin azalmasına neden olmaktadır.

This work compares an energy cost and an energy consumption results of the 4 wt.% cupper mixed aluminum based powder metal (PM) compacts processing under induction or furnace heating. Total power and energy consumptions and total energy costs per kilogram and compact have been analyzed. T6 precipitation heat treatment applications have been applied with two different methods, one with 2.8 kW, 900 kHz ultra-high frequency induction heating system (UHFIHS), other with 2 kW chamber furnace. In the first method, Al-Cu PM compacts have been heated by induction at 580 °C in one minute and then cooled down by water. Afterwards, the samples have been heated 170, 180, 190 and 200 °C respectively for artificial ageing and cooled naturally. In the second treatment, unlike the first study, Al-Cu PM compacts are heated by chamber furnace at 540 °C in 5 hours and cooled by water. Then PM compacts are artificially aged at 190 °C in 10 hours with same furnace. During both processes, energy and power consumptions for each defined process have been measured. Optimum heat treatment of the induction is determined. The cheaper energy cost is obtained by the induction heat treatment.

Muestras de las aleaciones 6082 A1 y 7075 A1 se sometieron a un tratamiento térmico en horno de inducción de ultraalta frecuencia (UHFIHS) a 580 ºC durante 1 min y suministro de agua al final del proceso. El envejecimiento artificial se llevó a cabo a 190 °C durante 2, 4, 6 y 8 min. En ambas aplicacio-nes, el calentamiento se llevó a cabo utilizando un sistema de inducción con una frecuencia de 900 kHz y una potencia de 2,8 kW. Para estas series y diseños de aluminio, se calcularon los costos del tratamiento térmico. Adicionalmente, se compararon los valores de dureza de las muestras de 6082 A1 y 7075 A1 envejecidas artificialmente a 190 °C durante 10 h con los métodos convencionales 540 °C durante 5 h. Los resultados de dureza de la muestra 6082 Al obtenidos en 10 h mediante métodos convencionales, tardaron sólo 8 min mediante el envejecimiento artificial con el sistema de inducción.

Aluminum-based composite materials are frequently preferred in many new-generation engineering applications due to their high strength, wear and corrosion resistance, improvement of mechanical properties, machinability, and low density. Mechanical alloying has an important place in the production of composites with high properties in powder metallurgy, which is one of the composite material production methods. In this paper, the deformation of Al 2024 alloy powder, which is frequently used in the industry, is investigated by the three-dimensional ball mill. Three different rotation speeds (150, 200 and 250[Formula: see text]rev/min), three different ball-to-powder ratio (5:1, 10:1 and 20:1) and three different milling times (30, 60 and 90[Formula: see text]min) were used in the milling processes. Deformations in the powders were evaluated by particle size analysis and powder structure examination. The obtained results were analyzed with analysis of variance and regression method, three-dimensional graphics, and scanning electron microscope images. When the results are examined, the maximum percent areas covered by the deformed particles and maximum particle size among the selected experimental parameters were obtained at 250[Formula: see text]rev/min, 20:1 ball-to-powder ratio and 60[Formula: see text]min as 6.849% and 54[Formula: see text][Formula: see text]m.

In this study, pure aluminum (Al) powder metal (PM) compacts are sintered conventional or induction systems. PM compacts are sintered by furnace at 600ºC in 60 minutes in the conventional sintering process. In the other process, PM compacts are sintered by induction system at seven different sintering temperatures from 550 C to 610 C in 4 minutes. 2.8 kW, 900 kHz ultra-high frequency induction system (UHFIS) used for heating application of induction sintering process. Densities and hardness values are investigated for both processes. During these sintering processes, all energy consumption results are measured and calculated, then compared with each other. The effects of the sintering time increase in the induction sintering process on energy cost have been analyzed. Optimum sintering temperature of the induction sintering process is determined. It has been seen that the cheaper energy cost is obtained by the induction system for sintering application.