1. Microstructural and elastic properties of stable aluminium-rich TiAl and TiAl2 formed phase Intermetallics
- Author
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Erick Ogam, Henry Otunga, Andrew O. Oduor, Nicholas O. Ongwen, Daoud Chanbi, Zine El Abiddine Fellah, Department of Physics and Materials Science, Maseno University, Maseno, Kenya, Laboratoire d’Electrochimie, Corrosion, Métallurgie et Chimie Minérale, Université des Sciences et de la technologie de Houari Boumediene, Algeria, Ondes et Imagerie (O&I), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Materials Science, Maseno University, Maseno, Kenya., and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)
- Subjects
Aerospace materials ,Materials science ,Intermetallics ,Ab initio ,Intermetallic ,chemistry.chemical_element ,Thermodynamics ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Condensed Matter::Materials Science ,Tetragonal crystal system ,Aluminium ,Phase (matter) ,Physics::Atomic and Molecular Clusters ,Automotive materials ,General Materials Science ,Lamellar structure ,Elastic modulus ,Mechanical Engineering ,Ti32Al68 and Ti40Al60 alloys ,Elastic properties ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Ab-initio calculations ,[PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] ,0104 chemical sciences ,chemistry ,Mechanics of Materials ,0210 nano-technology ,Titanium - Abstract
International audience; We studied aluminium-rich Ti-Al (Ti32Al68 and Ti40Al60) binary alloys that were composed of TiAl and TiAl2 lamellar microstructures. The law of mixtures was employed in calculating the theoretical Young’s moduli. The lattice parameters of the alloys showed that both were tetragonal crystals. In the computational study, we made use of our modified method for the stress–strain calculation of elastic constants. The alloys at the respective chemical compositions were modelled by creating titanium (Ti) supercells, which were then doped by replacing some of the Ti atoms with aluminium atoms. The values of elastic moduli were verified by the ab initio calculation in this work, which showed a perfect agreement. The Pugh’s ratio showed that both the alloys are ductile.
- Published
- 2021