Microstructures and mechanical properties of a multi-phase β-solidifying TiAl alloy densified by spark plasma sintering

Voisin, Thomas; Monchoux, Jean‐Philippe; Hantcherli, Muriel; Mayer, Svea; Clemens, Helmut; Couret, Alain

doi:10.1016/j.actamat.2014.03.058

Cited by 103 publications

(64 citation statements)

References 14 publications

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“…Among the chemical compositions which have been investigated by SPS, the TNM alloy also provided high standard mechanical properties following the requirements used in the present work [29]. The creep strength of TNM-SPS is very similar to that of IRIS-SPS.…”

Section: Discussionmentioning

confidence: 52%

“…For instance, Thomas et al [28] has found that in as-Hipped condition, GE-48 exhibits a higher ductility than GE-47. Moreover, a TNM alloy processed by SPS [29] exhibits a very high strength at room and high temperatures but a limited ductility (0.9% of plastic elongation). This behavior was attributed to the non-deformation of the lamellar colonies ascribed to a high proportion of 2 phase in such a low-aluminum content alloy.…”

Section: The Iris Alloymentioning

confidence: 99%

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Development of a TiAl Alloy by Spark Plasma Sintering

Couret

Voisin

Thomas

et al. 2017

JOM

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Section: Discussionmentioning

confidence: 52%

Section: The Iris Alloymentioning

confidence: 99%

Development of a TiAl Alloy by Spark Plasma Sintering

Couret

Voisin

Thomas

et al. 2017

JOM

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“…The alloys with fine-grained, fully lamellar microstructure exhibit reasonable strength and high ductility. Moreover, the globular γ grains, which are located in the colony boundaries, are filled-up during plastic deformation with dislocations and deformation twins, which can compensate the lack of independent slip systems in the lamellae [23]. Thus, the refined lamellae colony size and the globular γ grains in the lamellar boundaries are favourable to increase ductility.…”

Section: Spot Weldingmentioning

confidence: 98%

“…It is thus concluded that probably the superheated γ particles are effective heterogeneous nucleation sites for β grains and they refine the lamellar colonies. of similar materials at both RT and high temperatures [20][21][22][23]. The high ductility of the BM especially at high temperature is due to its duplex microstructure.…”

Section: Spot Weldingmentioning

confidence: 99%

In situ study of phase transformations during laser-beam welding of a TiAl alloy for grain refinement and mechanical property optimization

et al. 2015

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“…by implementation of precipitation hardening, which further extend the application range of -TiAl based alloys. In general, advanced TiAl alloys, such as TNB and TNM alloys, are complex multi-phase alloys which can be processed by ingot or powder metallurgy as well as precision casting methods [6,7,10,13,29,30,31]. Each process leads to specific microstructures which can be altered and optimized by thermomechanical processing and/or subsequent heat treatments [7,13,15,32].…”

Section: Introductionmentioning

confidence: 99%

Advanced Intermetallic Titanium Aluminides

Clemens

Smarsly

Güther³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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After almost four decades of intensive fundamental research and development activities intermetallic titanium aluminides have found application in aircraft and automotive engines. The advantage of this class of innovative high-temperature materials is their low density in combination with good strength and creep properties up to 800°C. A drawback, however, is their limited ductility at room temperature, which is reflected in a low plastic fracture strain. Advanced engineering TiAl alloys are complex multi-phase materials which can be processed by ingot or powder metallurgy, precision casting methods as well as additive manufacturing, e.g. electron beam melting. Each production process leads to specific microstructures which can be altered and optimized by thermo-mechanical processing and/or subsequent heat-treatments. The aim of these heat-treatments is to provide a microstructure with balanced mechanical properties, i.e. sufficient ductility at room temperature as well as creep strength at elevated temperature. In order to achieve this goal, the knowledge of the occurring solid state phase transformations including order/disorder reactions is essential. Therefore, thermodynamic calculations were conducted at first to predict the phase diagram of engineering TiAl alloys. After experimental verification, these phase diagrams provided the basis for the development of the heat-treatments mentioned above. To account the influence of deformation and kinetic aspects sophisticated ex-and in-situ methods have been employed to investigate the evolution of the microstructure during thermo-mechanical processing and subsequent heat-treatments. For example, in-situ high-energy Xray diffraction was conducted to study dynamic recovery and recrystallization processes during hot-deformation tests. Summarizing all results a consistent picture regarding processing and mechanical properties of advanced engineering TiAl alloys can be given.

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Microstructures and mechanical properties of a multi-phase β-solidifying TiAl alloy densified by spark plasma sintering

Cited by 103 publications

References 14 publications

Development of a TiAl Alloy by Spark Plasma Sintering

Development of a TiAl Alloy by Spark Plasma Sintering

In situ study of phase transformations during laser-beam welding of a TiAl alloy for grain refinement and mechanical property optimization

Advanced Intermetallic Titanium Aluminides

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