Microstructure and oxide particle stability in a novel ODS γ-TiAl alloy processed by spark plasma sintering and laser additive manufacturing

3D magnetic patterning in additive manufacturing via site-specific in-situ alloy modification

“…During localized melting large thermal gradients (G) and high solidification front velocities (V) result in non-equilibrium elemental partitioning or complete loss of elemental partitioning and meta-stable supersaturated phases [4,5]. While this may lead to phases with unwanted properties, it also can be exploited for producing parts from materials that are difficult to produce using conventional manufacturing methods such as super-saturated alloys with superior mechanical properties in comparison with conventional alloys [8][9][10] or oxide dispersion strengthened alloys [11,12]. The very high energy densities can further lead to compositional variation due to the volatilization of certain elements [5,13].…”

Laser Based Additive Manufacturing Technology for Fabrication of Titanium Aluminide-Based Composites in Aerospace Component Applications

“…Oxide dispersion strengthen (ODS) has been used by Kenel et al [14] to fabricate Ti-45Al-3Nb-< 0.2Y 2 O 3 at.% and studied the microstructure. The traditional microstructure of α 2 + γ and near-lamellar were observed.…”

“…A possible replacement of Ni-based superalloys is gamma-titanium aluminide (γ-TiAl) considered in manufacturing aero-engine and automobile engine parts because of their high strength, high stiffness, light weight good oxidation and corrosion resistance [11][12][13][14][15][16][17][18][19][20]. The choice of γ-TiAl is hinged on the fact that its density is almost half of Ni-based superalloy and high temperature creep properties [21,22] with application temperature up to 750°C [23].…”

“…Apart from the potentially improved geometrical complexity, additive manufacturing (AM) permits manufacturing of innovative materials with functionally graded capabilities during fabrication [14]. The applicability of TiAl alloys is becoming more progressive due to the growing knowledge of the connections concerning mechanical properties and microstructural evolution as well as modifications in processing operations [18].…”

“…Currently, AM has gained acceptance for manufacturing customized products with complex geometrical freedom, more homogeneous microstructure and functionally enhanced parts gradually replacing traditional processes [14,28,32]. Due to this property, it is possible to manufacture components and finished parts which could not be implemented with conventional manufacturing technologies or only at great expense.…”