Please use this identifier to cite or link to this item:
Title: Determination of microstructure and mechanical and thermophysical properties of Al–Si–Mg-XCr alloy
Authors: Kaygısız, Y.
Palta, Ç.
Engin, S.
Keywords: CrSi2 phase
Heat treatment
Tensile strength
Aluminum alloys
Heat treatment
Iron compounds
Magnesium alloys
Silicon alloys
Specific heat
Surface analysis
Tensile strength
After-heat treatment
Cr addition
Cr alloys
Crsi2 phase
Eutectic alloys
Hardness values
Properties of Al
Strength values
Chromium alloys
Issue Date: 2024
Publisher: Elsevier Ltd
Abstract: The study added different proportions of Cr to the Al–Si–Mg eutectic alloy and applied heat treatment to the quaternary alloy. So, the Al–Si–Mg eutectic alloy's microstructure and morphology were looked at after Cr was added and it was heated. In addition, the hardness, tensile strength, fracture surface analysis, and thermoelectric properties of newly produced Al-12.95 % Si-4.96 % Mg-X%Cr alloys were also determined. In the newly formed alloy, along with the expected Si and Mg2Si phases in the Al matrix phase, a randomly distributed CrSi2 binary intermetallic phase in a white hexagonal structure was observed with the effect of Cr addition. Additionally, a magnesium-rich Al9FeMg3Si5 intermetallic phase was observed, which we think was formed by the effect of Fe impurity atoms. Hardness and tensile strength values, which are the mechanical properties of the alloy, increased significantly after heat treatment. The hardness value of the 0.5 % Cr-added sample increased by approximately 77 % and reached 107.95 ± 6.0 kg/mm2. At the same time, the hardness value of the intermetallic CrSi2 phase in the quaternary Al-12.95 wt%Si-4.96 wt%Mg-1.0%Cr alloy was found to be 794.3 ± 30 kg/mm2. Similarly, the maximum tensile strength value of the 0.5 % Cr-added sample after heat treatment increased by approximately 105 % and reached 160.53 MPa. Melting temperatures (Tm) (K), fusion enthalpy (ΔH) (J/g), and specific heat Cpl (J/gK) were determined for non-heat-treated materials. The 0.5, 1.0, and 1.5 Cr-added samples had Tm of 563.38 °C, 558.44 °C and 572.61 °C, respectively. The ΔH value of samples with 0.5 %, 1.0 % and 1.5 % Cr addition is 605.70 (J/g), 579.92 (J/g) and 552.24 (J/g), respectively. Cpl was 0.724 J/g.K, 0.698 J/g.K and 0.653 J/g.K for 0.5 %, 1.0 %, and 1.5 % Cr-added samples. In both heat-treated and non-heat-treated samples, Cr enhanced electrical resistance. © 2023 Elsevier B.V.
ISSN: 0254-0584
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

Show full item record

CORE Recommender

Page view(s)

checked on Mar 4, 2024

Google ScholarTM



Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.