Magnetic property of Al-Mg alloys and intermetallic compounds

[摘要] Magnetization (M) of binary Al-Mg alloys and intermetallic compounds were measured in the temperature (T) range from 10 to 300 K. The Al-rich alloys Al - 2, 3, 4, 5, and 10 at% Mg) revealed diamagnetic contributions to the magnetization correlating to the Mg concentrations. For the beta-phase Al3Mg2 the M vs T curve lay very close to that of pure Mg over the entire measured T region. The magnetization of the gamma-phase samples exhibited enhanced paramagnetism for Al44Mg56 and Al12Mg17, but the diamagnetism for Al45Mg55. There were diamagnetic contributions to the magnetization of the Mg-rich alloys (Mg - 5, 10, and 15 at% Al) depending on the Al concentration, possibly due to the gamma-phase precipitations. Heat capacity of the gamma-phase samples and pure Al were measured to estimate the electronic specific heat coefficients which were found to be almost the same. Density functional theory calculations for the Al-Mg compounds were carried out to aid interpretation of the observed magnetization. (C) 2021 Elsevier B.V. All rights reserved.

[发布日期] 2021-10-05

[关键词] Al-Mg alloys;Al12Mg17;Magnetization;Diamagnetism;DFT calculations