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Sains Malaysiana 48(3)(2019): 661–668
http://dx.doi.org/10.17576/jsm-2019-4803-20
Effect
of Equal Channel Angular Pressing Processing Routes on Corrosion Resistance and
Hardness of Heat Treated A356 Alloy
(Kesan
Pemprosesan Laluan Penekanan Sudut Saluran Sama ke atas Rintangan Kakisan dan
Kekuatan Haba Dirawat Aloi A356)
MOHAMED A. GEBRIL1,2*, M. ZAIDI. OMAR1, NK. OTHMAN3 & I.F. MOHAMED1,4
1Department
of Mechanical and Materials Engineering, Faculty of Engineering and Build
Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul
Ehsan, Malaysia
2Department
of Mechanical Engineering, Faculty of Engineering, Benghazi University,
Benghazi, Libya
3School
of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan
Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
4Fuel
Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul
Ehsan, Malaysia
Diserahkan: 8 Jun 2018/Diterima: 25 Disember 2018
ABSTRACT
Equal channel angular pressing (ECAP)
via routes A and Bc was used to process heat treated A356 alloy. The samples
produced a range of microstructures in order to investigate the effect of
straining on its corrosion behavior in 3.5 wt. % NaCl solution and hardness.
The ECAP was conducted at room temperature in a mold with
channel angle of 120°. The results show that brittle coarse silicon particles
were effectively fragmented into smaller size in the Al-rich matrix after the
processing. The hardness and corrosion resistance test showed improvement after
T5 and T6 heat treatment, preferably to T6 due to wholly changed in silicon
particles morphology than T5. The hardness increased with ECAP processing
from 60.66 Hv to 1133.47, 124.91 Hv after three passes route Bc and four passes
route A, respectively. The evaluation of corrosion resistance of the alloy
showed improvement from 0.0424 to 0.00173, 0.00149 mmy-1 after
three passes route Bc and four passes route A, respectively. In this research,
both strength and corrosion resistance are improved by ECAP processing
of A356 alloy using both routes.
Keywords: A356; corrosion rate; ECAP;
grain size; heat treatment; microgalvanic cell
ABSTRAK
Dalam kajian ini, kaedah penekanan sudut saluran sama melalui
laluan A dan Bc telah digunakan untuk memproses aloi A356 yang dirawat dengan
rawatan haba. Sampel dengan pelbagai jenis mikrostruktur telah disediakan untuk
mengkaji kesan terikan terhadap kekerasan dan sifat kakisan aloi A356 dalam
larutan NaCl 3.5%. Kaedah ECAP dijalankan pada suhu bilik dengan
menggunakan acuan yang mempunyai sudut saluran 120°. Keputusan kajian menunjukkan bahawa
selepas pemprosesan, partikel silikon kasar dan rapuh bersepai menjadi partikel
bersaiz kecil dalam matriks kaya Al. Ujian kekerasan dan ujian ketahanan
kakisan menunjukkan bahawa sifat mekanik aloi A356 bertambah baik selepas
rawatan haba T5 dan T6, terutamanya T6, disebabkan perubahan morfologi partikel
silikon yang begitu ketara. Kekerasan aloi A356 masing-masing meningkat
daripada 60.66 Hv kepada1133.47 Hv dan 124.91 Hv selepas pemprosesan ECAP melalui laluan Bc tiga kali dan laluan A empat kali. Keputusan
penilaian menunjukkan bahawa ketahanan kakisan aloi masing-masing meningkat
daripada 0.0424 kepada 0.00173 dan 0.00149 mmy-1 selepas
pemprosesan ECAP melalui laluan Bc tiga kali dan laluan A empat kali.
Oleh itu, dapat disimpulkan bahawa kekuatan dan ketahanan kakisan aloi A356
meningkat dengan menggunakan kaedah pemprosesan ECAP melalui
kedua-dua laluan.
Kata kunci: A356; ECAP;
kadar kakisan; rawatan haba; saiz butiran; sel mikrogalvanik
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*Pengarang
untuk surat-menyurat; email: gebril.ukm@gmail.com
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