Fabrication of Ti2AlC/TiAl Composites Using Cobustion Reaction Process.

Mikami, Hiroshi; Harada, Kozo; Tsuda, Hiroshi; Nakayama, Yutaka

doi:10.2355/isijinternational.31.1272

Cited by 36 publications

(10 citation statements)

References 2 publications

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“…Recently, several methods have been applied to fabricate TiAl matrix composites, such as vacuum arc remelting (VAR) [22], hot isostatic pressing (HIP) [12,23,24], spark plasma sintering (SPS) [25], mechanical alloying (MA) [26], powder metallurgy (PM) [27], and Self-Propagating High-Temperature synthesis (SHS) [11]. For example, Ti 2 AlC-Al 2 O 3 /TiAl composites were synthesized by vacuum sintering Ti-50 at% Al Pre-Alloyed powders and carbon nanotube (CNTs) [18].…”

Section: Introductionmentioning

confidence: 99%

Low-temperature synthesis and characterization of Ti2AlC/TiAl in situ composites via a reaction Hot-Pressing Process in the Ti3AlC2-Ti-Al system

Ning

Feng

et al. 2015

Met. Mater. Int.

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Ti2AlC/TiAl in situ composites were fabricated via a reaction Hot-Pressing Process using Ti3AlC2, Ti, and Al powders as initial materials. The effect of Ti2AlC content on the phases and microstructure of the as-sintered composites was investigated by XRD and SEM. The mechanical properties such as Vickers hardness, flexural strength and fracture toughness of the as-sintered composites were also tested. The products consisted of Ti2AlC, γ-TiAl and α2-Ti3Al as the major phases. Ti2AlC reinforcements were mainly distributed in the grain boundaries, resulting in obvious γ+α2 grain refinement. With increasing Ti3AlC2 content (up to 5 wt%), the Vickers hardness, flexural strength and fracture toughness of the as-sintered composite reached the maximum values of 3.7 GPa, 651.5 MPa, and 10.89 MPa·m 1/2 , respectively. Analysis of fracture surface and crack propagation paths indicated that crack deflection and crack bridging of the in situ precipitated Ti2AlC phases obtained by decomposing Ti3AlC2 were the main reasons for the observed composite toughening.

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Section: Introductionmentioning

confidence: 99%

Low-temperature synthesis and characterization of Ti2AlC/TiAl in situ composites via a reaction Hot-Pressing Process in the Ti3AlC2-Ti-Al system

Ning

Feng

et al. 2015

Met. Mater. Int.

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“…To improve these properties, recently this compound has been made as a composite material containing a second phase such as boride, carbide, nitride, or oxide. For instance, TiB 2 /TiAl composite [3,4] , SiC/TiAl composite [5] , Al 2 O 3 /TiAl composite [6] and Ti 2 AlC/TiAl composite [5] have been studied to incorporate the high strength and stiffness of these ceramics into low density of TiAl alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and mechanical properties of TiC particle reinforced TiAl composites by spark plasma sintering

Yue

et al. 2007

J. Wuhan Univ. Technol.

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Using spark plasma sintering(SPS) technique, TiC particle reinforced γ-TiAl composites were prepared with varying weight fraction of TiC powders. The effects of the TiC fractions and distributions on the properties of the composites were investigated. The composite containing 7wt% TiC had the optimum three-point bending strength of 842 MPa,which was 200 MPa greater than that of the unreinforced γ-TiAl intermetallic. The degradation of the bending strength occurred in the composites containing more than 7wt% TiC and this was believed to be attributed to agglomerated particles of TiC, which acted as crack initiation and propagation sites. The increase of strength in TiC reinforced IMCs came from the grain refinement and the interaction of dislocations with the reinforcing particles. The bending strength of the IMC containing 7wt% TiC was theoretically estimated to increase by 85 MPa and 200 MPa, respectively, by the grain refi nement and dislocation strengthening, the total of which was almost in accordance with the improvement in that of the unreinforced γ-TiAl intermetallic when considering normal estimation errors.

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“…1) Combustion synthesis utilizes the propagation of a combustion front through the sample to achieve material processing. [2][3][4][5][6] The energy for propagation of the combustion front is obtained from the exothermic heat of the synthesis reaction. The unreacted portion in front of the combustion front is heated by this energy release, and then again undergoes exothermic synthesis.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of in Situ TiSi (Ti5Si3, TiSi)/TiC Local Reinforced Steel Matrix Composite via Combustion Synthesis

Yú

Sun

et al. 2009

ISIJ Int.

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An in situ TiSi (Ti 5 Si 3 , TiSi)/TiC local reinforced steel matrix composite was successfully fabricated via combustion synthesis of Cu-Ti-Si system. XRD results show that the reinforced region of the composites is composed of Fe, Cu, TiSi and Ti 5 Si 3 as well as TiC phases. SEM observation shows that the morphologies of the Ti 5 Si 3 particles are coarse acicular/irregular particles and short fibrous/coarse elliptic shape in transition and reinforced region, respectively. TiC particles lie in transition region near the interface and their morphologies are polygon/quadrangle, with sizes ofϳ74 mm DTA analyses show that, without addition of Cu, slight TiSi (TiSi 2 and Ti 5 Si 3 ) compounds form via solid diffusion process. After addition of Cu, Cu and Ti reaction occurs firstly, forming a serious of Cu-Ti compounds, at the same time, the reaction heat ignites the subsequent reaction of CuTi and Si and according forms TiSi (Ti 5 Si 3 ) compounds.KEY WORDS: steel matrix composites; in situ reinforced locally; microstructures; combustion synthesis. 1401© 2009 ISIJ the TiSi MMCs can be fabricated at a relative low temperature.In the previous work of our group, a local in situ AlTiSi reinforced aluminium composite was successfully synthesized by SHS-cast process with reaction system of Al-Ti-Si.11) The purpose of this study is to develop a simplified route to produce a high quality TiSi particle reinforced steel MMCs. Thermodynamic ConsiderationDuring the exothermic reactions in powder mixtures, Cu, Ti and Si may interact to form possible products due to the existence of the following chemical reactions. The Gibbs free energy, DG Q of reactions (1)- (7) has been calculated using the thermodynamic data from literature 12,13) and their results are shown in Fig. 2. Note that the overall 1 mol of the reactants was used for the calculation of changes in the Gibbs free energy, DG Q and the adiabatic temperature, T ad in order to compare the feasibility and tendency of these reactions. It can be seen that the DG Q of these reactions are all negative, which indicates that the seven reactions can take place. The DG Q of reactions (5)-(7) are less than those of reactions of (1)-(4), which indicates that reactions (5)-(7) are most likely to occur. Accordingly, it can be concluded that the displacement reaction (8) In order to confirm whether or not the combustion reactions can self-sustain, the critical value of copper content can be estimated by calculation of adiabatic temperature T ad . It is well known, in a combustion synthesis reaction process, the possible maximum temperature of an exothermic reaction can attain under adiabatic conditions. This maximum temperature is adiabatic temperature T ad , which can be calculated from the heat capacities and enthalpies of formation and transformation. 14) Usually, T ad can be used to ascertain whether or not a synthesis for a given material can be accomplished by a combustion synthesis method. It has been empirically suggested that combustion will not become self-sustaining unles...

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Fabrication of Ti2AlC/TiAl Composites Using Cobustion Reaction Process.

Cited by 36 publications

References 2 publications

Low-temperature synthesis and characterization of Ti2AlC/TiAl in situ composites via a reaction Hot-Pressing Process in the Ti3AlC2-Ti-Al system

Low-temperature synthesis and characterization of Ti2AlC/TiAl in situ composites via a reaction Hot-Pressing Process in the Ti3AlC2-Ti-Al system

Microstructures and mechanical properties of TiC particle reinforced TiAl composites by spark plasma sintering

<b>Fabrication of <i>in Situ</i></b> TiSi (Ti<sub>5</sub>Si<sub>3</sub>, TiSi)/TiC Local Reinforced Steel Matrix Composite <i>via</i> Combustion Synthesis

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