Structure and properties of nanocrystalline Cu70Fe18Co12 obtained by mechanical alloying
Identifieur interne : 000142 ( PascalFrancis/Checkpoint ); précédent : 000141; suivant : 000143Structure and properties of nanocrystalline Cu70Fe18Co12 obtained by mechanical alloying
Auteurs : Warda Laslouni [Algérie] ; Kamel Taibi [Algérie] ; Djaffar Dahmoun [Algérie] ; Mohamed Azzaz [Algérie]Source :
- Journal of non-crystalline solids [ 0022-3093 ] ; 2007.
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- Pascal (Inist)
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Abstract
Cu70Fe18Co12 alloy is prepared by mechanical alloying of pure Cu, Fe, Co powder using a high energy ball mill, with increasing milling time ranging from 4 to 8, 24, 36 and 54 h. The variation of the morphology and the elemental distribution were measured at these different stages on various grains of the alloy using a scanning electron microscope with a dispersive energy analyzer. Atomic clusters of iron were observed on some grains after 8 h of milling, confirming the non-homogenisation of the powder at this stage. Beyond 12 h, the homogenisation is ensured over a volume of one cube micron. Microstructural changes during the mechanical alloying have been studied by X-ray diffractometry (XRD) and Mössbauer spectroscopy. X-ray diffraction measurements confirm the dissolution of iron and cobalt phases in the FCC matrix of copper after 24 h of milling with increase of the structural parameter. This same dissolution was also measured by Mössbauer spectroscopy, confirming that after 4 h of milling the CuFe phase begins to form and iron dissolution is incomplete with partial amount of alpha Fe phase surviving after 36 h of milling.
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Fe<sub>18</sub>
Co<sub>12</sub>
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Fe<sub>18</sub>
Co<sub>12</sub>
obtained by mechanical alloying</title>
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<series><title level="j" type="main">Journal of non-crystalline solids</title>
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<front><div type="abstract" xml:lang="en">Cu<sub>70</sub>
Fe<sub>18</sub>
Co<sub>12</sub>
alloy is prepared by mechanical alloying of pure Cu, Fe, Co powder using a high energy ball mill, with increasing milling time ranging from 4 to 8, 24, 36 and 54 h. The variation of the morphology and the elemental distribution were measured at these different stages on various grains of the alloy using a scanning electron microscope with a dispersive energy analyzer. Atomic clusters of iron were observed on some grains after 8 h of milling, confirming the non-homogenisation of the powder at this stage. Beyond 12 h, the homogenisation is ensured over a volume of one cube micron. Microstructural changes during the mechanical alloying have been studied by X-ray diffractometry (XRD) and Mössbauer spectroscopy. X-ray diffraction measurements confirm the dissolution of iron and cobalt phases in the FCC matrix of copper after 24 h of milling with increase of the structural parameter. This same dissolution was also measured by Mössbauer spectroscopy, confirming that after 4 h of milling the CuFe phase begins to form and iron dissolution is incomplete with partial amount of alpha Fe phase surviving after 36 h of milling.</div>
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