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The Atmosphere and Milling Devices Effect on the Activation Energy for Crystallization of a Partially Amorphized Ni-MO Alloy

Published online by Cambridge University Press:  02 July 2020

R. Martínez-Sánchez ,
I. Estrada Guel ,
L. Béjar-Gómez ,
F. Espinosa-Magaña ,
D. Jaramillo Vigueras ,
A. Duarte Moller  and
S. Diaz de la Torre
R. Martínez-Sánchez
Affiliation:
Centro de Investigatión en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120 C.P., 31110, Chihuahua, Chih., México.
I. Estrada Guel
Affiliation:
Centro de Investigatión en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120 C.P., 31110, Chihuahua, Chih., México.
L. Béjar-Gómez
Affiliation:
Centro de Investigatión en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120 C.P., 31110, Chihuahua, Chih., México.
F. Espinosa-Magaña
Affiliation:
Centro de Investigatión en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120 C.P., 31110, Chihuahua, Chih., México.
D. Jaramillo Vigueras
Affiliation:
Instituto Politécnico Nacional, ESIQIE, UPALM-Zacatenco, C.P. 07300, México, D.F., México.
A. Duarte Moller
Affiliation:
Centro de Investigatión en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120 C.P., 31110, Chihuahua, Chih., México.
S. Diaz de la Torre
Affiliation:
Centro de Investigatión en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120 C.P., 31110, Chihuahua, Chih., México.
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Abstract

Although amorphous phases produced by mechanical alloying (MA) in the Ni-Mo system have been reported before. It has not been presented the influence of using different milling devices and atmospheres. This work is focused to the characterization of amorphous structures thus obtained in a Mo-47 at. % Ni alloy. Selected composition corresponds to the equiatomic NiMo intermetallic. The characterization was carried-out by XRD, SEM-EDS, DSC and TEM. High resolution XRD reveals that the MA′ed products undergo partial amorphization, as shows Figure 1. The main difference in the patterns is a region that corresponds to typical Nickel reflections. Nickel preferential amorphization after milling was evident. Apparently, a major grade of amorphization was attained when using the Simoloyer mill. A rough crystallite size was calculated using Scherrer equation, which reveals that this parameter reached its minimum value with the Simoloyer mill. During DTA analysis, it was observed the presence of an exothermic peak in all samples.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1272 - 1273
Copyright
Copyright © Microscopy Society of America 2001

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References

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