Heat treatment influence on the structural and magnetic properties of the intermetallic Fe56.25Al43.75 alloy prepared by mechanical alloying and arc-melted

21st Latin American Symposium on Solid State Physics

Hernández, J. S. Trujillo^1 ; Tabares, J.A.^1 ; Alcázar, G. A. Pérez^1

Departamento de Física, Universidad Del Valle, Meléndez, A. A. 25360 Cali, Colombia^1

关键词: Arc-melting methods;    Disordered phase;    Hyperfine magnetic-field distributions;    Magnetic studies;    Planetary ball mill;    Structural and magnetic properties;    Structural disorders;    X-rays diffraction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/480/1/012020/pdf
DOI  :  10.1088/1742-6596/480/1/012020

来源: IOP

【 摘 要 】

Alloys of the Fe56.25Al43.75system were prepared by mechanical alloying (MA) using a high energy planetary ball mill, with milling times in the range from 12 up to 96 h named MA0 samples. The sample milled for 48 hours was heat treated at 700 °C for 9 days. Then this sample was milled for times of 1, 4, 8, 12, 24, and 48 h, named MA1 samples. Additionally, and for comparison, it was prepared a Fe56.25Al43.75sample by arc-melting method. For all samples, the structural and magnetic study was conducted by X-rays diffraction (XRD) and Mossbauer spectrometry (MS). The XRD results show that the system is nanostructured and the MA0 samples present only the BCC disordered phase, whose lattice parameter remains relatively constant with milling time. For MA1 samples it was identify the FeAl, Fe3Al, FeO and α-Fe phases. The Mossbauer spectra for all samples were fitted by using a hyperfine magnetic field distribution (HMFD), and a paramagnetic site for all the times used here. The ferromagnetism increases when milling time increases, and this is a consequence of the structural disorder induced by mechanical alloying.