Synthesis of Fe60Mn27.5Al11Si1C0.5 Low-Density Steel using Mechanical Alloying Followed by Sintering
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Abstract
In this study, a novel low-density steel composed of Fe60Mn27.5Al11Si1C0.5 was synthesised using the mechanical alloying (MA) technique. The elemental powder was milled for 60 hours by using a planetary ball mill. MA powder is consolidated and sintered in a tube furnace in Argon environment at 1050C. X-ray diffraction (XRD) is carried out to characterise the phase formed during MA. XRD results show the formation of a multi-phase structure i.e., aluminium iron carbide (AlFe3C0.5) and manganese silicon carbide (Mn5SiC). The microstructural and morphological characterisation is carried out by scanning electron microscopy. Morphology of the mixture of the metal powders is continuously changing from the initial stage to the completion of the milling due to the different phenomena occurring at different time intervals. Microhardness is measured of the sintered sample and it is found as 230 VHN. The density of the synthesised alloy is reduced by approximately 20% of the Iron.
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