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Casting Fe–Al-based intermetallics alloyed with Li and Ag

Published online by Cambridge University Press:  13 July 2016

M. Villagomez-Galindo ,
G. Carbajal-De la Torre ,
J.C. Romo-Castañeda ,
A. Bedolla-Jacuinde ,
H.A. González-Rojas  and
M.A. Espinosa-Medina Open the ORCID record for M.A. Espinosa-Medina [Opens in a new window]
M. Villagomez-Galindo
Affiliation:
Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, México; and Department of Mechanical Engineering (EUETIB), Universitat Politécnica de Catalunya, 08034 Barcelona, Spain
G. Carbajal-De la Torre
Affiliation:
Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, México
J.C. Romo-Castañeda
Affiliation:
Facultad de Química, Universidad Nacional Autónoma de México, C.P. 04510 Ciudad de México, D.F., México
A. Bedolla-Jacuinde
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, México
H.A. González-Rojas
Affiliation:
Department of Mechanical Engineering (EUETIB), DEFAM Group, Universitat Politécnica de Catalunya, 08034 Barcelona, Spain
M.A. Espinosa-Medina*
Affiliation:
Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, México
*
a)Address all correspondence to this author. e-mail: marespmed@gmail.com
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Abstract

The effect on the mechanical properties at room temperature of Li and Ag additions to the Fe–Al (40 at.%)-based alloy produced by conventional casting were evaluated in this work. Alloying elements were added into a previously molted Fe–(40 at.%) aluminum-based alloy, stirred, and then cast into sand molds to directly produce tensile specimens. To determine the mechanical properties, tensile tests and hardness measurements were performed. The additions of both Ag and Li showed an increase in ductility and tensile strength of the intermetallic alloys. In addition, hardness was substantially increased with the Li addition. Lithium additions promoted a solid solution hardening, whereas 3 at.% of Ag additions promoted ductility due to a microstructural modification and to the formation of a soft Ag3Al phase. Characterization by both optical and electronic microscopy, energy dispersive spectroscopy microanalysis, and x-ray diffraction supported the mechanical characterization.

Keywords

iron aluminidesalloycastingmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2473 - 2481
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Copyright
Copyright © Materials Research Society 2016 

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