Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)
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Melih Turan İpekçi
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.
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© 2015, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Effect of beam oscillation on borated stainless steel electron beam welds
- Effects of cold isostatic pressing and granule size distribution on the densification of alumina ceramics
- Influence of Al2O3 addition on microstructure and mechanical properties of 3YSZ-Al2O3 composites
- Dynamic behavior of stiffened plates under underwater shock loading
- Mechanical properties of conventionally and induction sintered Fe-based powder metal bushings
- Mechanical and physical properties of hybrid reinforced (Al/B4C/Ni(K)Gr) composite materials produced by hot pressing
- Application of the Taguchi method for the optimization of the strength of polyamide 6 composite hot plate welds
- Corrosion behavior of Haynes® 230® nickel-based super-alloys for integrated coal gasification combined cycle syngas plants: A plant exposure study
- Three dimensional stress analysis of adhesively bonded and multi pinned metal matrix composite plates
- Functional ANOVA investigation of the effects of friction welding parameters on the joint characteristics of aluminum based MMC to AISI 304 stainless steel
- Comparability of structured and flat reference specimens made of thin sheet metal
- A novel procedure for failure criteria determination at solder joints under the board level drop test
- Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)
- CPE: Novel method to shorten the lead time for laser micro-machining
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Effect of beam oscillation on borated stainless steel electron beam welds
- Effects of cold isostatic pressing and granule size distribution on the densification of alumina ceramics
- Influence of Al2O3 addition on microstructure and mechanical properties of 3YSZ-Al2O3 composites
- Dynamic behavior of stiffened plates under underwater shock loading
- Mechanical properties of conventionally and induction sintered Fe-based powder metal bushings
- Mechanical and physical properties of hybrid reinforced (Al/B4C/Ni(K)Gr) composite materials produced by hot pressing
- Application of the Taguchi method for the optimization of the strength of polyamide 6 composite hot plate welds
- Corrosion behavior of Haynes® 230® nickel-based super-alloys for integrated coal gasification combined cycle syngas plants: A plant exposure study
- Three dimensional stress analysis of adhesively bonded and multi pinned metal matrix composite plates
- Functional ANOVA investigation of the effects of friction welding parameters on the joint characteristics of aluminum based MMC to AISI 304 stainless steel
- Comparability of structured and flat reference specimens made of thin sheet metal
- A novel procedure for failure criteria determination at solder joints under the board level drop test
- Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)
- CPE: Novel method to shorten the lead time for laser micro-machining
