Sains Malaysiana 30: 195-202 (2001) Sains Fizis dan Gunaan /
Physical and Applied Sciences
Effects to Magnesium addtion on Microhardness
in Eutectic Al-Si-Mg Alloys
Abdul Razak Daud & Ibrahim Abu Talib
Pusat Pengajian Fizik Gunaan
Universiti Kebangsaan Malaysia
43600 UKM Bangi, Selangor D.E.,Malaysia
Mohd bin Harun
Institut Penyelidikan Teknologi Nuklear Malaysia
43000 Kajang, Selangor D.E.,Malaysia
ABSTRACT
The eutectic Al-Si-Mg alloys were prepared and heat treated at 327oC and 540oC for 10 hours and followed by ageing at 160oC for various ageing times. The microhardness of the alloys increased as the ageing time and magnesium content increased. The addition of magnesium as well as ageing strengthened the matrix and improved the second phase morphology.
ABSTRAK
Aloi-aloi Al-Si-Mg eutektik telah disediakan dan dirawat haba pada suhu 327oC dan 540oC selama 10 jam dan seterusnya dilakukan penuaan pada suhu 160oC bagi beberapa tempoh tertentu. Mikrokekerasan aloi berkenaan telah meningkat apabila tempoh penuaan dan kandungan magnesium ditingkatkan. Penambahan magnesium dan juga penuaan telah menguatkan matrik dan memperbaiki lagi morfologi fasa kedua.
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