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The Effect of Mn Addition and Heat Treatment on the Microstructure, Mechanical, and Thermophysical Properties of Al-Si-Mg Eutectic Alloy

The study added Mn at different rates to the Al–Si–Mg eutectic alloy and heat-treated the quaternary alloy. Therefore, the microstructure morphology of the Al–Si–Mg eutectic alloy was examined after Mn addition and heat treatment. Also determined were the hardness, tensile strength, fracture surface...

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Published in:International journal of metalcasting 2024-07, Vol.18 (3), p.2283-2297
Main Authors: Kaygısız, Yusuf, Palta, Çetin, Kaymaz, Tuba Çifci, Engin, Sevda
Format: Article
Language:English
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Summary:The study added Mn at different rates to the Al–Si–Mg eutectic alloy and heat-treated the quaternary alloy. Therefore, the microstructure morphology of the Al–Si–Mg eutectic alloy was examined after Mn addition and heat treatment. Also determined were the hardness, tensile strength, fracture surface analysis, and thermoelectric characteristics of the newly produced Al–12.95%Si–4.96%Mg–X%Mn [X=0.5, 1.0, and 1.5 (wt.)] alloys. Along with the predicted Si and Mg 2 Si phases in the Al matrix phase, this investigation found a randomly distributed Mn-rich Al 15 Mn 3 Si 2 intermetallic phase and a Mg-rich Al 5 Si 3 Mg 2 phase. Mn-doped samples without heat treatment were somewhat softer than the parent alloy. After heat treatment, the hardness more than doubled for the Al–Si–Mg eutectic system and Mn-doped samples. After heat treatment, the alloy with 1.5% Mn added had the maximum hardness value of 94.3±5.0 HV. Heat treatment improved tensile strength by up to 80%, and the alloy with 0.5% Mn had 144.7 MPa. Melting temperatures ( T m ) (K), fusion enthalpy (Δ H ) (J/g), and specific heat C pl (J/gK) were determined for non-heat-treated materials. The 0.5, 1.0, and 1.5 Mn-added samples had T m of 566.30, 568.96, and 566.40 °C, respectively. The Δ H value of samples with 0.5%, 1.0% and 1.5% Mn addition is 662.29, 657.93 and 639.11, respectively. C pl was 0.788, 0.781, and 0.761 J/g.K. for 0.5%, 1.0%, and 1.5% Mn-added samples. In both heat-treated and non-heat-treated samples, Mn enhanced electrical resistance.
ISSN:1939-5981
2163-3193
DOI:10.1007/s40962-023-01165-9