EFFECT OF SCANDIUM ADDITION ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ALUMINUM 2014

• Main Author: Mulia Latief, Farid
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66751
• Institution: Institut Teknologi Bandung

Aluminum is most widely applied metals in the aviation industry. One type of aluminum that is used in aircraft components is the 2014 series. The demand for more efficient flights requires development be carried out on the materials used in aircraft components to increase the strength of the material. One of the elements that are currently being studied to increase the strength of aluminum alloys as a microalloying element is scandium. In this research, the addition of scandium of 0.4 wt.% to the aluminum 2014 alloy was carried out. Scandium was alloyed through a casting process. This research evaluates the hardness, strength, and microstructure of the alloy under as-cast and as-homogenized conditions. The characterization carried out included metallography, tensile test, hardness test, Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), and X-ray Diffraction (XRD). The results of this research indicate that the addition of 0.4 wt.% scandium to the aluminum 2014 alloy caused an increase in the hardness value of 19.60 HV (36.85 %) in the as-cast sample and 21.60 HV (34.72 %) in the as-homogenized sample, an increase in the ultimate tensile strength value of 114.08 MPa (147.16 %) in the as-cast sample and 86.63 MPa (69.31 %) in the as-homogenized sample, as well as a refinement in the SDAS (Secondary Dendrite Arm Spacing) value of 6.35 ?m (31.99 %) in the as-cast sample and the grain size of 80.60 ?m (25.66 %) in the as-homogenized sample.