Open AccessOksida kaya-Si Tingkatkan Rintangan Pengoksidaan Struktur Terkimpal Al-Mg-Si Pada Suhu 400oC dan 600oC
Author(s) -
Nur Azida Che Lah,
Muhamad Hellmy Hussin
Publication year - 2020
Publication title -
journal of advanced research in fluid mechanics and thermal sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.247
H-Index - 13
ISSN - 2289-7879
DOI - 10.37934/arfmts.77.1.5168
Subject(s) - materials science , alloy , microstructure , oxide , metal , metallurgy , penetration (warfare) , welding , phase (matter) , layer (electronics) , composite material , chemistry , organic chemistry , operations research , engineering
At high temperatures the Al-Mg-Si alloy structure is characterized by low resistance due to the complex oxidation effects involving the formation of layers or scale oxides and internal degradation. The situation becomes more complex when this alloy undergoes a welding process of metal bonding that involves heating and cooling. Subsequently, the welded structure is exposed to high temperature oxidation resulting in different oxide formation and phase changes. Therefore, the present study aims to determine the effect of high temperature oxidation on Al-Mg-Si alloy welded joint using ER 4043 (Al-5% Si) filler metal. The analysis and characterization of samples include morphology and microstructure using OM and SEM / EDX, and the oxide phase was determined using XRD. The addition of 5% Si from the filler metal and the formation of SiO2 on the surface of the welded structure due to the oxidation exposure was found to be effective in lowering the oxidation level by reducing penetration of oxygen diffusion into the alloy substrate. SiO2 also helps strengthen the Al2O3 protective layer. In conclusion, the use of an ER 4043 as a filler metal containing a 5% of Si as a major secondary element in the Al-Mg-Si welded structure is suitable for high temperature applications.