Casting of Intermetallics

McQuay, P.; Sikka, V.K.; Khalfalla, Y.E.; Benyounis, K.Y.

doi:10.1016/b978-0-12-803581-8.03554-2

Cited by 2 publications

(5 citation statements)

References 9 publications

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“…The infrastructure and knowledge base of producing TiAl-based intermetallic alloys via conventional methods is very mature, resulting in the mass production of simple shapes [6,16,17].…”

Section: The Proposed Next Generation Lpbf Manufacturing Systemsmentioning

confidence: 99%

“…The research institutes modified and improved upon most of the methods (casting, forging, sheet forming, extrusion, etc.) of manufacturing intermetallic alloys [6]. The TiAl, NiAl and FeAl intermetallic phases were the prime focus of thr ORNL project due to their exceptional intermetallic properties [2,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The TiAl, NiAl and FeAl intermetallic phases were the prime focus of thr ORNL project due to their exceptional intermetallic properties [2,6,7]. Of all the intermetallic alloys developed by the ORNL project, titanium aluminide (TiAl)-and nickel aluminide (NiAl)-based intermetallic alloys have already found industrial applications or are close to commercialization [2,6]. FeAl-based alloys did not receive much attention since their critical ordering temperature is only in the range of 500-700 • C [8].…”

Section: Introductionmentioning

confidence: 99%

“…The literature reveals that the infrastructure and knowledge base of producing TiAlbased intermetallic alloys via the conventional methods (casting, forging, sheet forming, extrusion, wire assembly, etc.) [6,16] are very mature, and their technological maturity has been proven by the recent application of the alloy in the General Electric GEnX jet engine [17]. It is reported that replacing the heavyweight Ni-based superalloys in jet engines, turbine engines, aero-engines etc.…”

Section: Introductionmentioning

confidence: 99%

“…with TiAl-based intermetallic alloys could reduce the structural weight of high-performance engines by 20-30% [18][19][20]. Unfortunately, the low susceptibility to plastic deformation and a high tendency for brittle cracking [6] of TiAl-based intermetallic alloys have made it very challenging to use the conventional methods to produce near-net shape components that would enhance the performance and efficiency of TiAl-based intermetallic alloy components [2,17].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Additive Manufacturing of Ti-Based Intermetallic Alloys: A Review and Conceptualization of a Next-Generation Machine

Dzogbewu

Preez

2021

Materials

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TiAl-based intermetallic alloys have come to the fore as the preferred alloys for high-temperature applications. Conventional methods (casting, forging, sheet forming, extrusion, etc.) have been applied to produce TiAl intermetallic alloys. However, the inherent limitations of conventional methods do not permit the production of the TiAl alloys with intricate geometries. Additive manufacturing technologies such as electron beam melting (EBM) and laser powder bed fusion (LPBF), were used to produce TiAl alloys with complex geometries. EBM technology can produce crack-free TiAl components but lacks geometrical accuracy. LPBF technology has great geometrical precision that could be used to produce TiAl alloys with tailored complex geometries, but cannot produce crack-free TiAl components. To satisfy the current industrial requirement of producing crack-free TiAl alloys with tailored geometries, the paper proposes a new heating model for the LPBF manufacturing process. The model could maintain even temperature between the solidified and subsequent layers, reducing temperature gradients (residual stress), which could eliminate crack formation. The new conceptualized model also opens a window for in situ heat treatment of the built samples to obtain the desired TiAl (γ-phase) and Ti3Al (α2-phase) intermetallic phases for high-temperature operations. In situ heat treatment would also improve the homogeneity of the microstructure of LPBF manufactured samples.

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“…The infrastructure and knowledge base of producing TiAl-based intermetallic alloys via conventional methods is very mature, resulting in the mass production of simple shapes [6,16,17].…”

Section: The Proposed Next Generation Lpbf Manufacturing Systemsmentioning

confidence: 99%