M. HOCINE Mustapha

MCB

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Department

Departement of MECHANICAL ENGINEERING

Research Interests

sciences des matériaux Sciences des matériaux

Contact Info

University of M'Sila, Algeria

Email : mustapha.hocine@univ-msila.dz

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Recent Publications

2020

Nickel-doped nanostructured Fe70Al30 alloys: the role of Ni on the microstructure and the evolution of hyperfine and magnetic properties

We have investigated the effect of the Nickel concentration on the crystal structure and microstructure, as well as on the hyperfine and magnetic properties of nanostructured (Fe0.7Al0.3)100-xNix powders (x = 0, 5, 10 and 15 at.%) fabricated by mechanical alloying. After 72 h of milling, all the Fe(Al, Ni) samples are single-phase disordered solid solutions with body centred cubic crystal structure. A progressive reduction of the lattice parameter value from 2.9084 Å for the Ni-free FeAl binary alloy down to 2.8897 Å for the x = 15 ternary compound is observed. The mean grain size of the nanocrystals also diminishes down to c.a. 20 nm as the Ni concentration is increased, whereas the mechanically-induced microstrain remains almost constant at around 0.5%. The magnetic measurements show a ferromagnetic character of all the samples at room temperature with a slight decrease of both saturation magnetization and coercivity as the Ni concentration rises. The fit of Mössbauer spectra collected at room temperature gives an almost constant value (around 26 T) for the mean hyperfine magnetic field, <Bhf>(T). Hence, the addition of Ni to Fe (Ni,Al) solid solution has not a clear influence on the value of <Bhf>, although the hyperfine field distributions suggest somewhat different local environments of Fe atoms.
Citation

M. HOCINE Mustapha, (2020), "Nickel-doped nanostructured Fe70Al30 alloys: the role of Ni on the microstructure and the evolution of hyperfine and magnetic properties", [national] Materials Letters , ELSEVIER SCIENCE BV

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2018

Effect of milling time on the structural and magnetic properties of (Fe0.7Co0.3)95Si5 alloy obtained by mechanical alloying

This work focuses on the elaboration of nanostructured (Fe0.7Co0.3)95Si5 as a function of milling time, t, (in the 0 – 60 h range) powders by mechanical alloying process. The magnetic properties of as-prepared alloys were characterized by vibrating sample magnetometer (VSM). From X-ray diffraction spectra, we have shown that, after 12 h milling, the Fe(Co, Si) solid solution was completely formed. It is characterized by body centred cubic with a lattice parameter a =2.86105A° at 24 h. During the milling process, the dimensions of the particles get reduced to nanometer levels. The hysteresis loops confirmed the ferromagnetic character of (Fe0.7Co0.3)95Si5 nanostructured powders. We have found that the saturation magnetization, Ms, and the coercivity, Hc increases during the milling and reaches a maximum at 24 h and 12h respectively. All these results will be correlated and discussed.
Citation

M. HOCINE Mustapha, Abderrahim GUITTOUM, Messaoud HEMMOUS, Pedro GORRIA, Jesús Angel Blanco Rodríguez, David Martínez-Blanco, , (2018), "Effect of milling time on the structural and magnetic properties of (Fe0.7Co0.3)95Si5 alloy obtained by mechanical alloying", [international] Second International Workshop on Magnetic Materials and Nanomaterials , Boumerdes

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2017

The role of silicon on the microstructure and magnetic behaviour of nanostructured (Fe0.7Co0.3)100-xSix powders

Single-phase (Fe0.7Co0.3)100-xSix nanostructure powders (x = 0, 5, 10, 15 and 20) have been elaborated by mechanical alloying in order to investigate the effect of silicon on the microstructure and magnetic properties of these alloys. A disordered Fe(Co,Si) solid solution with body centered cubic (bcc) crystal structure is formed after 72 h of milling for all the compositions. The addition of Si gives rise to a progressive decrease of the lattice parameter, from about 2.865 Å for the binary Fe70Co30 compound down to 2.841 Å for the powder with x=20. The sample with the uppermost Si content exhibits the lowest value for the mean grain size (≈ 10 nm) as well as the largest microstrain (above 1.1%). All the samples are ferromagnetic at room temperature, although the saturation magnetization value reduces almost linearly by adding Si to the composition. A similar trend is observed for the hyperfine magnetic field obtained from the analysis of the room temperature Mössbauer spectra. The hyperfine field distributions show a broad double-peak shape for x > 0, which can be ascribed to multiple local environments for the Fe atoms inside a disordered solid solution.
Citation

M. HOCINE Mustapha, Abderrahim GUITTOUM, Messaoud HEMMOUS, David Martínez-Blanco, Pedro GORRIA, Badis RAHAL, Jesús Angel Blanco Rodríguez, J. J. Suñol, Ali LAGGOUN, , (2017), "The role of silicon on the microstructure and magnetic behaviour of nanostructured (Fe0.7Co0.3)100-xSix powders", [national] Journal of Magnetism and Magnetic Materials , ELSEVIER SCIENCE BV

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2014

Elaboration and characterization of (Fe70Co30)100-xSix nanostructured powders

We have studied the effect of Si content on the structural and magnetic properties of nanostructured (Fe70Co30)100-xSix (x = 0, 5, 10, 15, 20. at%) powders elaborated by high energy ball milling. From X-ray diffraction spectra, we evidenced the total formation of cubic centered (cc) Fe(Co, Si) solid solution, for all (Fe70Co30)100-xSix powders. The lattice parameter was found to decreases with increasing Si content. The grains size and microdistorsions increases (decreases) respectively when Si content increases. We have found that the saturation magnetization, Ms, decreases with increasing Si content. A minimum of the coercivity (41 Oe) was found for 5% of Si.
Citation

M. HOCINE Mustapha, Abderrahim GUITTOUM, Messaoud HEMMOUS, Badis RAHAL, David Martínez-Blanco, Pedro GORRIA, Jesús Angel Blanco Rodríguez, Ali LAGGOUN, , (2014), "Elaboration and characterization of (Fe70Co30)100-xSix nanostructured powders", [international] Physmed euro institut, 1er Colloque Nanophysique et Nano-matériaux , university of science and technology houari boumediene

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