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

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 san...

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Published inJournal of materials research Vol. 31; no. 16; pp. 2473 - 2481
Main Authors Villagomez-Galindo, M., Carbajal-De la Torre, G., Romo-Castañeda, J.C., Bedolla-Jacuinde, A., González-Rojas, H.A., Espinosa-Medina, M.A.
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 29.08.2016
Springer International Publishing
Springer Nature B.V
Subjects
Alloying additive
Alloying elements
Alloys
Aluminum
Aluminum base alloys
Analysis
Applied and Technical Physics
Biomaterials
Carbon
Casting
Chemical elements
Corrosion resistance
Ductility
Electronics
Grain boundaries
Grain size
Heat treating
High temperature
Inorganic Chemistry
Intermetallic compounds
Intermetallics
Lithium
Materials Engineering
Materials research
Materials Science
Mechanical properties
Microscopy
Nanotechnology
Powder metallurgy
Solidification
Studies
alloy
casting
microstructure
iron aluminides
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Summary: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.
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ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2016.249