ANALISIS SIFAT MEKANIK DAN STRUKTUR MIKRO PADUAN ALUMINIUM ADC12 DENGAN TEKNIK PENGECORAN SEMI SOLID (RHEOCASTING)
Abstract
Aluminum silicon alloys (Al-Si) are generally used in the machine industry because of its superior properties such as;light weight, good heat conductivity, good casting properties, and good welding properties (Chiang, 2009). Aluminumdie casting 12 (ADC12) is one type of Al-Si alloy with the addition of Cu, Fe, Mn, Mg, Zn, Ti, Cr, Ni, Pb, and Snelements. In general, this study aims to find out the comparison of mechanical properties and microstructure ofaluminum alloys before and after stirring. Specific to determine the effect of pouring temperature variation (580, 600,620, 640, 660, and 680 OC) on fixed rotation and timing (300 rpm, 60 sec) to the mechanical properties andmicrostructure of aluminum alloys of ADC12. The research method used is literature study, aluminum alloy preparationADC12, equipment of manufacture (melting furnace, stir bar, and metal mold), specimen for tensile test, hardness test,and microstructure test, specimen test, and analysis of yield data testing with statistical methods. The conclusion of theresearch of semi-solid casting of aluminum alloy ADC12 is the difference of mechanical properties of aluminum alloyADC12 after the semi-solid casting process with the preparation of slurry without and with stirring. Where there is amarked improvement in the properties of aluminum alloys ADC12 marks and with stirring. The hardness of aluminumalloys ADC12 after stirring is higher than before stirring. The highest hardness occurred at 600 OC casting temperatureof 87.9 HB after stirring and lowest at 680 OC at 76.7 HB before stirring. The highest tensile stress with stirring occursat a temperature of 600 OC of 235 N / mm2 and the lowest tensile stress at 680 OC casting temperature of 224 N / mm2.Increased tensile stresses of aluminum alloys ADC12 in the semi-solid casting process are also followed by an increasein tensile strain. The pouring temperature has no effect on the mechanical properties of aluminum alloys ADC12because the freezing speed remains the same at different pouring temperatures.References
Antara, N.G., Tabuchi, S., Suzuki, K., Kamado, S., and Kojima, Y., 2005, Refining Nuclei and Distributing Spherical
Primary Crystals in Billets for Semi-Solid Casting, Journal of Materials Online, http://www.azom.com.
ASM, Handbook, 1998. Properties and selection: non ferrous alloys and special purpose-material,Volume 2. ASM
International, Materials Park, OH.
ASM, Handbook, 1992. Casting, Volume 15. ASM International, Materials Park, OH
Chiang KT, Liu NM, Tsai TC. 2009. Modeling and analysis of the effects of processing parameters on the performance
characteristics in the high pressure die casting process ofAl–SI alloys. Int J Adv Manuf Technol 2009; 41:1076–84.
Fan, Z., 2002, “Semisolid Metal Processingâ€, International Materials Reviews, Vol. 47, No.2.
Flemings, M.C., 1991, “Behavior of Metal Alloys in The Semisolid Stateâ€, Metallurgical Transactions A, Vol. 22A,
–981.
Ivanchev, L., 2006, Rheo-Processing Of Semi-Solid Metal Alloys A NewTechnology For Manufacturing Automotive
And Aerospace Components, CSIR, North America.
Janudom,S. T. Rattanochaikul, R. Burapa, S. Wisutmethangoon, J. Wannasin. 2010. Feasibility of semi-solid die casting
of ADC12 aluminum alloy. Trans. Nonferrous Met. Soc. China 20(2010) 1756−1762.
Lashkari, O. and Ghomashchi, R., 2007, “The implication of Rheology in Semi–Solid State Metal Process : An
overviewâ€, Journal of Materials Processing Technology, 182, 229–240.
Martinez, K.M., 2000, Effect of Mold Coating on The Thermal Fatigue in Al Permanent Mold Casting, AFS transaction.
Spencer DB, Mehrabian R, Flemings MC.1972. Rheological behavior of Sn-15 Pct Pb in the crystallization range.
Metall Mater Trans B 1972; 3: 1925–32. In Zhenyu Wang, Zesheng Ji, Maoliang Hu, Hongyu Xu. 2011. Evolution
of the semi-solid microstructure of ADC12 alloy in a modified SIMA process.
Scamans, G. and Fan, Z., 2005, Twin roll rheocasting of aluminum alloys, Light Metal Age 63 (6): 6- 9.
Sutantra, I.N, 2001, Teknologi Otomotif, Guna Widya, Surabaya.
Surojo, Eko, Heru S, Teguh T, Joko S. 2010. Studi Pengaruh Temperatur Pemasukan Dan Pengeluaran Batang
Pengaduk Terhadap Pembentukan Struktur Globular Pada Proses Rheocasting. Jurnal MEKANIKA, Volume 9
Nomor 1, September 2010.
Surdia, T., dan Shinroku Saito. 1992. Pengetahuan Bahan Teknik, PT Pradnya Paramita, Jakarta.
Surdia, T., dan Chijiwa, K., 2000, Teknik Pengecoran Logam, PT Pradnya Paramita, Jakarta.
Wang Zhen-yu, JI Ze-sheng, SUN Li-xin, XU Hong-yu. 2010. Microstructure of semi-solid ADC12 aluminum alloy
adopting new SIMA method. Trans. Nonferrous Met. Soc. China 20(2010) s744-s748.
Wang, Zhenyu, Zesheng Ji, Maoliang Hu, Hongyu Xu. 2011. Evolution of the semi-solid microstructure of ADC12
alloy in a modified SIMA process. MATERIALS CHARACTERIZATION 62 (2011) 925–930.
Wannasin, J. and Thanabumrungkul, S., 2006, Development of a Novel Semi-Solid Metal Processing Technique for
Aluminium Casting Applications. Prince of Songkla University, Thailand.
Winterbottom, W.L., 2000, “Semi–Solid Forming Application : High Volume Automotive Productsâ€, Metallurgical
Science and Technology, Vol.18, No. 2, 5–10.
Zhao-hua HU, Guo-hua WU, Peng ZHANG, Wen-cai LIU, Song PANG, Liang ZHANG, Wen-jiang DING. 2016.
Primary phase evolution of rheo-processed ADC12 aluminum alloy. Trans. Nonferrous Met. Soc. China 26(2016)
−27.
