Please use this identifier to cite or link to this item: http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1196
CHARACTERIZATION OF NI-CO-CR POWDERS OBTAINED BY MECHANICAL ALLOYING
LUIS CARLOS ORTIZ LUEVANO
EDNA PRIETO GARCIA
IVANOVICH ESTRADA GUEL
JOSE MARTIN HERRERA RAMIREZ
ROBERTO MARTINEZ SANCHEZ
Acceso Abierto
Sin Derechos Reservados
Mechanical alloying
In the present study four compositions of a Ni base alloys were synthesized by mechanical alloying, the compositions were: Ni81Co10Cr9, Ni72Co20Cr8, Ni72Co10Cr18 and Ni64Co20Cr16. Elemental powders with purity higher than 99.5% were used and milled for 0,5,10 and 15h in a high energy Spex 8000 mill. The process control agent used was methanol and the ball to powder ratio was 5:1. Microstructural characterization after the milling process was done by X-ray diffraction technique, using a panalytical X´pert pro diffractometer with Cu Kα radiation (= 1.5406Å) and operated at 40 kV and 35 mA in the 2θ range of 20–110°, the powder morphology and chemical composition in each phase were carried out using a JEOL JSM-5800 scanning electron microscopy equipped with an energy dispersive spectrometer and a High resolution field transmission electron microscopy JEOL JSM2200Fs+CS, 200KV. The density of the powders decreases while the size is heterogeneous and showed an increase in the hardness at higher milling times, which is due to the accumulation of lattice strain introduced by the mechanical alloying process. The microstructure showed a Ni-Co matrix and a segregated dark phase Cr-rich.
2013
Memoria de congreso
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Appears in Collections:Artículos de Congresos

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