Formation of TiAl–Ti2AlC in situ composites by combustion synthesis

Yeh, C.L.; Shen, Yung‐Shuen

doi:10.1016/j.intermet.2008.10.014

Cited by 36 publications

(17 citation statements)

References 35 publications

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“…TiAl/Ti 5 Si 3 composite is the most promising candidate for improving both the high temperature strength and toughness. Attempts have been made to obtain silicide and carbide phases through in situ combustion synthesis technique [6,7] within g-TiAl matrix.…”

Section: Introductionmentioning

confidence: 99%

Comparison of titanium silicide and carbide reinforced in situ synthesized TiAl composites and their mechanical properties

Rao

Vyas

2011

Intermetallics

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Section: Introductionmentioning

confidence: 99%

Comparison of titanium silicide and carbide reinforced in situ synthesized TiAl composites and their mechanical properties

Rao

Vyas

2011

Intermetallics

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“…According to the type of particle reinforcement used, ductility and toughness at ambient temperatures and also high-temperature strength, oxidation and creep resistance can be improved [17,18]. A number of TiAl matrix composites have been developed with different particle reinforcements such as Al 2 O 3 , TiB 2 , Ti 5 Si 3 , Si 3 N 4 , SiC, Ti 2 AlN and Ti 2 AlC that can be used for different purposes [19][20][21][22][23][24]. Among them, Ti 2 AlC has been considered as a beneficial particle because of the unusual combination of useful and unique properties like excellent machinability, thermal shock resistance, low density, good thermal and electrical conductivities and high-temperature oxidation resistance, which make it to exhibit both ceramic and metallic properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and oxidation behaviour of TiAl(Nb)/Ti2AlC composites fabricated by mechanical alloying and hot pressing

2016

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TiAl-based intermetallic matrix composites with dispersed Ti 2 AlC particles and different amounts of Nb were successfully synthesized by mechanical alloying and hot pressing. The phase evolution of Ti-48 at%. Al elemental powder mixture milled for different times with hexane as a process control agent was investigated. It was found that after milling for 25 h, a Ti(Al) solid solution was formed; also with increase in the milling time to 50 h, an amorphous phase was detected. Formation of a supersaturated Ti(Al) solid solution after 75 h milling was achieved by crystallization of amorphous phase. Addition of Nb to system also exhibited a supersaturated Ti(Al,Nb) solid solution after milling for 75 h, implying that the Al and Nb elements were dissolved in the Ti lattice in a nonequilibrium state. Annealing of 75 h milled powders resulted in the formation of equilibrium TiAl intermetallic with Ti 2 AlC phases that showed the carbon that originates from hexane, participated in the reaction to form Ti 2 AlC during heating. Consolidation of milled powder with different amounts of Nb was performed by hot pressing at 1000 • C for 1 h. Only the presence of γ -TiAl and Ti 2 AlC was detected and no secondary phases were observed on the base of Nb. Displacement of γ -TiAl peaks with Nb addition implied that the Nb element was dissolved into TiAl matrix in the form of solid solution, causing the lattice tetragonality of TiAl to increase slightly. The values for density and porosity of samples indicated that condition of hot pressing process with temperature and pressure was adequate to consolidate almost fully densified samples. The isothermal oxidation test was carried out at 1000 • C in air to assess the effect of Nb addition on the oxidation behaviour of TiAl/Ti 2 AlC composites. The oxidation resistance of composites was improved with the increase in the Nb content due to the suppression of TiO 2 growth, the formation and stabilization of nitride in the oxide scale and better scale spallation resistance.

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“…Composite strengthening is one of effective way to improve the deformability of TiAl alloy. Therefore, the TiAl intermetallic matrix composites (IMCs) have been developed to provide the right combination of high-temperature strength and creep resistance, and to resolve the problem of poor ductility and toughness at ambient temperatures [8][9][10]. Al 2 O 3 is often chosen as a ceramic reinforcement because of its advantageous thermo-mechanical behavior including wear resistance, environmental stability, high temperature strength, and close match on thermal expansion coefficients with γ-TiAl [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructure of Al2O3/TiAl in situ composites doped with Cr

2011

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Cr-doped Al 2 O 3 /TiAl in situ composites were successfully fabricated by hot-press-assisted exothermic dispersion method with elemental powder mixtures of Ti, Al, TiO 2 and Cr. The effect of the Cr addition on the microstructures and mechanical properties of the Al 2 O 3 /TiAl composites were investigated. The as-synthesized composites consisted of γ-TiAl, α 2 -Ti 3 Al, Al 2 O 3 , and a small amount of Laves phase Ti(Al,Cr) 2 . Microstructure analysis indicates that Al 2 O 3 particles mainly distributed on grain boundaries of the TiAl matrix. As the Cr content increases, the Al 2 O 3 particles are dispersed more fine and homogeneously in the TiAl matrix, which resultes in the increase of the hardness, flexural strength and fracture toughness of the composites gradually. When the Cr content was 3 wt.%, the flexural strength and fracture toughness of the Al 2 O 3 /TiAl composite reaches the top values of 820 MPa and 8.3 MPa·m 1/2 , respectively. The reinforcement mechanism of Cr addition to Al 2 O 3 /TiAl composites was also discussed.

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Formation of TiAl–Ti2AlC in situ composites by combustion synthesis

Cited by 36 publications

References 35 publications

Comparison of titanium silicide and carbide reinforced in situ synthesized TiAl composites and their mechanical properties

Comparison of titanium silicide and carbide reinforced in situ synthesized TiAl composites and their mechanical properties

Microstructure and oxidation behaviour of TiAl(Nb)/Ti2AlC composites fabricated by mechanical alloying and hot pressing

Mechanical properties and microstructure of Al2O3/TiAl in situ composites doped with Cr

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