Volume 6, No. 2, June 2018
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The Role of Al2O3 Nanoparticles Addition on Characteristic of Al6061 Composite Produced by Stir Casting Process

Anne Zulfia, Deliana Ramdaniawati, Donanta Dhaneswara
Department Metallurgy and Materials, Faculty of Engineering, Universitas Indonesia.
Abstract: Aluminium Matrix Composites (AMCs) reinforced with Al2O3 nano particles are widely used for
high performance application such as aerospace because aluminium is light weight and alumina has
good performance at high temperature. Alumina nano particles is added into molten Al with different volume
fraction from 0.2 vf-% to 1.2 vf-% while Mg is used as an external dopant with 10 wt-% to promote
wetting between aluminium and Al2O3. The Al alloy was then melted and Mg along with the reinforcement
was blended inside the molten metal by stirrier with rotational speed of 500 rpm at 800oC for 2 minutes
and degassing with Ar for 4 minutes to remove all of gas in molten Al. The molten composites then was
casted into plate and tensile test sample molds. The effect of Al2O3 nano particles on mechanical properties
and microstructure of composites was investigated. The optimum tensile strength, hardness and elongation
of composite was achieved at additon of 0.2vf-% Al2O3np with the value of 220 MPa, 61 HRB and 5.48%
respectivelly. Increasing hardness was caused by impedation of dislocation movements by nano-Al2O3
particles. It is found that the addition of more Al2O3np, the mechanical propeties decreased. The
microstructure observations showed that the composites yield finer grains than the unreinforced alloy
Addition of nano-Al2O3 particles also tend to form microporosity and agglomeration which would decrease
the tensile strength of composites.
Keywords: Aluminium composites, Al2O3 nano particles, mechanical properties, stir casting process.

Cite: Anne Zulfia, Deliana Ramdaniawati, Donanta Dhaneswara, "The Role of Al2O3 Nanoparticles Addition on Characteristic of Al6061 Composite Produced by Stir Casting Process," International Journal of Materials Science and Engineering, Vol. 6, No. 2, pp. 39-47, June 2018. doi: 10.17706/ijmse.2018.6.2.39-47


General Information

ISSN: 2315-4527 (Print)
Abbreviated Title: Int. J. Mater. Sci. Eng.
Editor-in-Chief: Prof. Emeritus Dato' Dr. Muhammad Yahaya
DOI: 10.17706/ijmse
Abstracting/ Indexing: Ulrich's Periodicals Directory, Google Scholar, Crossref
E-mail: ijmse@iap.org