EFFECTS OF Al2O3 NANOPARTICLES ADDITION ON HARDNESS AND THERMAL PROPERTIES OF Al-Zr-Ce/Al2O3 WITH 3 wt% Mg NANOCOMPOSITE PRODUCED BY STIR CASTING
| Main Authors: | Panji Maulana, Rd., M., Kirman, Sukarto W., Agus, Zulfia, Anne |
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| Other Authors: | Metallurgy and Materials Engineering Department, Faculty of Engineering, |
| Format: | Article info application/pdf eJournal |
| Bahasa: | ind |
| Terbitan: |
BATAN
, 2017
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| Subjects: | |
| Online Access: |
http://jurnal.batan.go.id/index.php/jsmi/article/view/4017 http://jurnal.batan.go.id/index.php/jsmi/article/view/4017/3497 |
Daftar Isi:
- EFFECTS OF Al2O3 NANOPARTICLES ADDITION ON HARDNESS AND THERMAL PROPERTIES OF Al-Zr-Ce/Al2O3 WITH 3 Wt-% Mg NANOCOMPOSITE PRODUCED BY STIR CASTING. Al-Zr-Ce alloy reinforced with Al2O3 nanoparticles with 3wt% Mg addition is proposed as one of the alternative material to replace ACSR as aluminum conductor. The composition of the nanocomposite consists of 0.12% Zr, 0.15% Ce, 3% Mg and 0.5-1.5 vf-% Al2O3. Fabrication of the nanocomposite is using stir casting method. Master alloy which consists of aluminum alloyed with Zr and Ce was manufactured. The master alloy was then melted and 3% Mg along with the reinforcement was blended inside the molten metal by stirring with rotational speed of 500 rpm at 850oC in an inert Ar gas environment. Chemical composition test confirmed the composition of alloying elements were close to the design except Ce, that could be related to limitation of OES and fading effect. The density of nanocomposite was decreased, while the porosity was increased with the addition of Al2O3. Nanocomposites’ hardness testing shows hardness increases with further addition of Al2O3, except the composite with 1.5 vf%of reinforcement that had lower hardness. Further addition of Al2O3 reinforcement to nanocomposite reduced its thermal expansion coefficient. SEM observation indicated that the Al2O3 nanoparticles were agglomerated and did not react to form interface layer. Nanocomposite 1.2 vf-% SEM observation shows that Ce inside of themicro structure did not segregate with Fe and Si, but seemed to react with Mg and Zr.ABSTRAKEFEK PENAMBAHAN NANOPARTIKELAl2O3 PADAKEKERASAN DAN SIFAT TERMAL DARI NANOKOMPOSIT Al-Zr-Ce/Al2O3 DENGAN 3 %BERAT Mg DIHASILKAN DENGAN PENGECORANADUK. PaduanAl-Zr-Ce diperkuat dengan nanopartikel Al2O3 dengan penambahan 3%berat Mg diajukan sebagai material alternative pengganti ACSR sebagai konduktor aluminium.Komposisi nanokomposit tersebut terdiri dari 0.12% Zr, 0.15% Ce, 3% Mg and 0.5-1.5 vf.% Al2O3. Fabrikasi material menggunakan metode pengecoran aduk. Paduan utama yang terdiri dari aluminium dipadukan dengan Zr dan Ce berhasil diproduksi. Paduan tersebut kemudian dilelehkan dan dicampurkan dengan 3% Mg bersama penguat dengan pengadukan berkecepatan 500 rpm pada temperatur 850oC dalam lingkungan gas inertAr. Pengujian komposisi kimia mengomfirmasi bahwa komposisi paduan hasil pengecoran mendekati dengan rancangan kecuali kandungan Ce, yang berhubungan dengan keterbatasan alat OES serta efek pengaburan kandungan. Densitas nanokomposit ditemukan berkurang, dengan kandungan porositas meningkat dengan peningkatan kandunganAl2O3.Kekerasan nanokomposit menunjukkan bahwa kekerasan bertambah dengan penambahan Al2O3, kecuali pada komposit dengan kandungan penguat 1.5 vf.% yang memiliki tingkat kekerasan lebih rendah. Penambahan penguat dapat mengurangi koefisien ekspansi termal komposit. Hasil pengamatan SEM dari nanokomposit dengan kadar penguat 1.2 vf% menunjukkan bahwa struktur mikro tidak bersegregasi dengan Fe dan Si, namun sepertinya bereaksi dengan Mg dan Zr.