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Influence of Rare-Earth Substitution for Iron in FeCrMoCB Bulk Metallic Glasses

Chinese Physics Letters 2010年第7期27卷 192-194页

作者： Abderrezak Bouchareb Badis Bendjemil Rafael Piccin Marcello Baricco Dipartimento di Chimica I.F.M/NIS/CNISM/INSTM Universita di Torino Via Giuria 9 10125 Torino Italy Laboratoire d'Etude et la Recherche de l'Etat Condensd (lerec) University of Badji Mokhtar P.O. Box 12 23000 Annaba Algeria University of Guelma P.O. Box 12 24000 Guelma Algeria

The effects of rare earth addition on the glass forming ability of Fe50-xCr15Mo14C15B6Mx （x =0, 2 and M=Y, Gd） bulks and ribbons are studied. The thermal and structural properties of the samples are measured by a combination of differential scanning calorimetry （DSC）, x-ray diffraction and scanning electron microscopy. Chemical compositions are checked by energy dispersive spectroscopy analysis. The copper mold casting technique leads to a fully amorphous structure up to 2mm only for compositions containing Y or Gd. In the case of ribbons, a fully amorphous phase is observed for all the compositions. The roles of Y and Gd are discussed on the basis of melting behavior analyzed by high-temperature DSC. Such elements act as oxygen scavengers, avoiding heterogeneous nucleation.

关键词： Dispersants Measurement Microscopy

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Crystallization Behavior of Fe_(50−x)Cr_(15)Mo_(14)C_(15)B_(6)M_(x)(x=0,2 and M=Y,Gd)Bulk Metallic Glasses and Ribbons by in situ High Temperature X-Ray Diffraction

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Chinese Physics Letters 2012年第10期29卷 235-238页

作者： Badis Bendjemil Abderrezak Bouchareb Ahmed Belbah Jamel Bougdira Rafael Piccin Marcello Baricco lerec Department of PhysicsUniversity of Badji-mokhtar-AnnabaAlgeria 2Department of Mechanical EngineeringFaculty of Science and TechnologyUniversity of 8 Mai 1945 GuelmaAlgeria 3Institut Jean LAMOURUniversity Henri poincarréNancyFrance 4IFM/NISUniversitàdi TorinoVia P.Giuria 910125 TorinoItaly

The effect of rare earth addition on thermal stability of Fe_(50−x)Cr_(15)Mo_(14)C_(15)B_(6)M_(x)(x=0,2 and M=Y,Gd)is *** and structural properties are measured using differential scanning calorimetry and x-ray diffraction,*** microstructure is observed by using a scanning electron microscope,and chemical composition is checked by energy dispersive spectroscopy *** effect of high temperature on the isothermal crystallization of Fe_(50−x)Cr_(15)Mo_(14)C_(15)B_(6)M_(x)(x=0,2 and M=Y,Gd)bulk metallic glass and ribbons is investigated by high-temperature x-ray *** is found that the crystallization behavior of Fe_(50−x)Cr_(15)Mo_(14)C_(15)B_(6)M_(x)(x=0,2 and M=Y,Gd)bulk metallic glass strongly depends on the annealing *** different crystallization behavior is believed to be due to the different structures that the metallic glass possesses at different temperatures.

关键词： microstructure crystallization metallic

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Adsorption of Fe（CO）5 and Fe（C5H5）2 on Si（111）7×7 Study by Scanning Tunneling Microscopy

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材料科学与工程（中英文A版） 2013年第7期3卷 443-447页

作者： Abdelbaki Chemam Mahieddine Ali Rachedi Preparatory School for Science and Technology of Annaba Laboratory of Surfaces and Interfaces Studies of Solids LESIMSAnnaba 23000 Algeria Preparatory School for Science and Technology of Annaba Laboratory Studies and Research of Condensed States LERECAnnaba 23000 Algeria

The adsorption at room temperature of ferrocene and iron pentacarbonyl on Si(111)7?7 have been studied. On Si(111)7?7, the adsorption sites have been identified by means of scanning tunneling microscopy. We propose a ferrocene adsorption model on Si(111)7?7, i. e., a di-sigma bridging by the molecule between an adatom and a restatom site similar to that proposed for the ethylene. For the iron pentacarbonyl, we have found evidence of a dissociative adsorption on nucleophilic sites. At a higher temperature, an exposure to iron pentacarbonyl lead to the growth of good quality iron silicide. Whereas, silicide carbide is formed on exposure to ferrocene. The films obtained can be explained by means of the chemisorption process at room temperature.

关键词：扫描隧道显微镜 Fe(CO)5 吸附位硅化物 Si(111) 五羰基铁二茂铁吸附模型

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