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<p>X-ray diffraction and Mössbauer spectroscopy were applied to monitor the process of alloy formation during synthesis of Co<sub>2</sub>FeAl compound via mechanical alloying method. After 20&#xa0;h of milling, the <i>bcc</i> solid solution was obtained, with an average crystallite size 23&#xa0;nm, mean level of lattice strains 0.75% and microhardness 650 HV. In the obtained material, the beginning of a Heusler phase was observed and the powder was subjected to subsequent heat treatment. After isothermal annealing at 700&#xa0;°C, the assumed Co<sub>2</sub>FeAl Heusler alloy with partially ordered <i>B</i>2 structure was successfully formed, without any secondary phases. Thermal process caused a slight increase in grain size (25&#xa0;nm) and a significant decrease of lattice strains (0.3%). Both milled and annealed powders are soft magnetic materials as revealed by macroscopic magnetic measurements. The obtained Co<sub>2</sub>FeAl Heusler alloy is characterized by a high saturation magnetization value of 143 emu⋅g<sup>− 1</sup>, which is equivalent to a magnetic moment of 5.14 µ<sub>B</sub> per formula unit. These results correspond well with the high value of the hyperfine magnetic field <i>B</i><sub><i>hf</i></sub> = 31.39(2) T revealed by Mössbauer spectroscopy for the Co<sub>2</sub>FeAl Heusler alloy.</p>

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Structure, mechanical and magnetic properties of Co2FeAl Heusler alloy prepared by mechanical alloying

  • 期刊论文

  • 发表日期：

    2026年4月18日

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  • E. Jartych,
  • T. Pikula,
  • D. Oleszak

摘要

X-ray diffraction and Mössbauer spectroscopy were applied to monitor the process of alloy formation during synthesis of Co2FeAl compound via mechanical alloying method. After 20 h of milling, the bcc solid solution was obtained, with an average crystallite size 23 nm, mean level of lattice strains 0.75% and microhardness 650 HV. In the obtained material, the beginning of a Heusler phase was observed and the powder was subjected to subsequent heat treatment. After isothermal annealing at 700 °C, the assumed Co2FeAl Heusler alloy with partially ordered B2 structure was successfully formed, without any secondary phases. Thermal process caused a slight increase in grain size (25 nm) and a significant decrease of lattice strains (0.3%). Both milled and annealed powders are soft magnetic materials as revealed by macroscopic magnetic measurements. The obtained Co2FeAl Heusler alloy is characterized by a high saturation magnetization value of 143 emu⋅g− 1, which is equivalent to a magnetic moment of 5.14 µB per formula unit. These results correspond well with the high value of the hyperfine magnetic field Bhf = 31.39(2) T revealed by Mössbauer spectroscopy for the Co2FeAl Heusler alloy.