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Magnetic Properties Evaluation of Fe-Al Nanocrystalline Alloys Fabricated by Mechanical Alloying Technique as a Function of Milling Time Tarigan, Kontan; Ginting, Masno
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i2.183

Abstract

Magnetic properties of nanocrystalline Fe50Al50 alloys prepared by mechanical alloying technique (using commercial Fe and Al powders as precursors) were studied in detail as a functions of the milling time ranging from 1 to 24 hrs. The structural analyses based on X-ray diffraction (XRD) and extended X-ray absorption fi ne structure spectroscopy (EXAFS) revealed that the alloying process took place after 12 hrs of milling time. Concerning themagnetic behavior, the data that were obtained from a superconducting quantum interference device (SQUID) showed that both the magnetic saturation (Ms) and the coercivity (Hc) depend strongly on the milling time. From the results that we obtain, we found out that by adjusting the milling time, is a key factor in obtaining an appropriate structural transformation and appropriate magnetization values.
STUDY OF MSSBAUER SPECTROSCOPY ON FE90-XMN10ALX (X = 10, 20, 30, AND 40 AT. %) BCC PHASE NANOCRYSTALLINE ALLOYS Tarigan, Kontan; Ginting, Masno
Teknologi Indonesia Vol 36, No 3 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i3.208

Abstract

Nanocrystalline alloys of Fe90-xMn10Alx (x= 10, 20, 30, and 40 at. %) were prepared via mechanical alloying technique using Fe, Mn, and Al commercial powders with a 48-hr milling time. Mssbauer spectroscopy show hyperfine field distribution (HFD) varied according to Fe content. HFD with concentration of x = 10, 20 dan 30 at. % repealed sexted structure and to be narrow with increasing of concentration x, and HFD shifted to smaller field value, i. e. 298.6, 262.6 and 240.8 kOe. For smallest Fe content (x = 40 at. %) repealed singlet spectrum with positive isomer (? ? 0,067 mm / s) without detected the HFD.
Local Structure and Magnetic Properties of Ni-Al-C Nanocrystalline Alloys Fabricated by Mechanical Alloying Technique as a Function of Carbon Content Tarigan, Kontan; Ginting, Masno
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i2.182

Abstract

Local structural and magnetic characterization of (Ni0.5Al0.5)100-xCx (x = 0, 10, 30, and 50 at. %) nanocrystalline alloys which were prepared by mechanical alloying (MA) technique at 12 hrs milling time, have been carried out in detail. The nanocrystalline size and shape were examined using scanning electron microscopy (SEM). The effect of carbon on structural properties has been investigated using x-ray diffractometer (XRD) and extended x-ray absorption fi ne structure spectroscopy (EXAFS), whereas magnetic properties was examined by vibrating sample magnetometer (VSM). All the samples revealed nanocrystalline alloys. The maximum magnetic saturation (Ms) at about 0.7 emu/g and the minimum coercivity (Hc) at about 135 Oe would be found for 10% carbon content.
Co-Authors Masno Ginting