Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)

Melih Turan İpekçi; Ahmet Güral; Süleyman Tekeli

doi:10.3139/120.110749

Article

Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)

Melih Turan İpekçi , Ahmet Güral and Süleyman Tekeli

Published/Copyright: May 15, 2015

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From the journal Materials Testing Volume 57 Issue 6

Abstract

In this study, pure aluminum powders were turned into bulk material using equal channel angular densification (ECAD)/equal channel angular pressing (ECAP) and further deformed up to 16 passes at 100 °C. For comparison, pure aluminum powders were also compacted in a mold without ECAD/ECAP process at the same temperature. The microstructures were characterized using TEM for grain size and shape measurements. In general, the grains were finer in the specimens processed by ECAD/ECAP than in the compacted specimen without ECAD/ECAP process. The high density which is very close to the full density of pure aluminum (2.7 g × cm^-3) was reached at the second pass of ECAD/ECAP. By the application of ECAD/ECAP process, severe plastic deformation enabled particles to be compacted into fully dense materials at much lower temperatures and shorter times, compared to the conventional sintering process. The ECAD/ECAP process was shown to provide an effective method for producing nano-sized grain and nearly full densification in aluminum powder.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurden Pulver aus Reinaluminium zu einem Werkstoff verarbeitet, in dem die Verfahren Equal Channel Angular Densification (ECAD) und Equal Channel Angular Pressing (ECAP) eingesetzt wurden. Danach wurden die Proben in bis zu 16 Durchgängen bei 100 °C weiter verformt. Zum Vergleich wurden Reinaluminiumpulver außerdem in einer Form ohne den ECAD/ECAP-Prozess bei derselben Temperatur verfestigt. Die hohe Dichte, die sehr nah an der Gesamtdichte von Reinaluminium (2,7 g × cm³) lag, wurde mit dem zweiten Bearbeitungsgang des ECAD/ECAP-Verfahrens erreicht. Durch die Anwendung des ECAD/ECAP-Prozesses wurde eine erhebliche plastische Verformung erreicht, mit der es gelang, Partikel in die voll verdichteten Materialien bei viel niedrigeren Temperaturen und kürzeren Zeiten im Vergleich zu konventionellen Sinterprozessen einzubauen. Der ECAD/ECAP-Prozess erwies sich als effektives Verfahren, um nanoskalige Körner zu erzeugen und eine nahezu vollständige Verdichtung der Aluminiumpulver zu erreichen.

§Correspondence Address, Melih Turan İpekçi, Department of Metal and Metallurgical Science, Technology Faculty, Gazi University, 06500 Besevler-Ankara, Turkey, E-mail: mipekci2000@yahoo.com

Melih Turan İpekçi is a PhD degree student in the Department of Metal and Metallurgical Science of the Technology Faculty, Gazi University, Ankara, Turkey. He received his MSc degree from the same university and department. His working area includes metal shape and design as well as powder metallurgy.

Assoc. Prof. Dr. Ahmet Güral is a lecturer in the Department of Metallurgical Science of the Technology Faculty, Gazi University, Ankara, Turkey. He received his MSc and PhD degrees from the Faculty of Metallurgy Education of Gazi University. His work at the university involves giving courses and conducting research in the areas of powder metallurgy, microstructure of steels as well as machinability of steel.

Prof. Dr. Süleyman Tekeli is a lecturer in the Department of Metallurgical Science of the Technology Faculty, Gazi University, Ankara, Turkey. He received his MSc and PhD degrees from the same faculty. His work at the university involves giving courses and conducting research in the areas of fuel. He is the author of a number of international publications on these subjects.

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Published Online: 2015-05-15

Published in Print: 2015-06-01

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https://doi.org/10.3139/120.110749