Analisis Kegagalan Hasil Uji Produk Pelek Aluminium Berdasarkan SNI 1896 : 2008

Apriardi Ihlas, Najmuddin Yahya

Abstract


The aluminium wheel rim product is one of the mandatory SNI products. The wheel rim product is directly related to the safety of the wearers. Some domestic industries have failed to meet the requirements of the SNI 1896: 2008, especially in testing the resistance for impact loads. The purpose of this research was to discover the causes of that failure. Several methods were carried out to find out the causes, namely the metallographic examination, the Scanning    Electron Microscopy/Energy   Dispersive   X-Ray   Spectroscopy (SEM/EDS), and the chemical composition. All data would be compared with Original Equipment Manufacturer (OEM) products. The results of the research proved that the too-high Fe content would form a needle structure which had a low interface bond to the aluminium matrix. This condition simplified the spreading of cracks. Based on the results of the chemical composition test and the Al-Si-Fe phase diagram, the intermetallic phase formed was β-AlFeSi, presumably. Also, two types of defect were found, interdendritic shrinkage and less gas porosity with the uneven distribution. The sharp form of the shrinkage defect and β-AlFeSi phase caused the stress concentration would become the initial crack. Consequently, all these conditions caused the low durability of the wheel rim product for the impact loads

Keywords


aluminium, wheel rim, intermetallic phase, needle structure

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