Microstructural evolution of TiAl-based alloys deformed by high-pressure torsion

Cao, Guanghui; Russell, Alan M.; Oertel, C.‐G.; Skrotzki, Werner

doi:10.1016/j.actamat.2015.07.012

Cited by 38 publications

(9 citation statements)

References 47 publications

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“…35 , TiB exhibit the orientation relationship (100)[00] TiB ||(11)[10] γ with neighbouring γ-matrix. Cao 36 et al . found the orientation relationships between α 2 -Ti 3 Al, γ-TiAl and Ti 2 Al as (0001)[110] α2 ||(0001)[110] Ti2Al ||(111)[01] γ .…”

Section: Resultsmentioning

confidence: 99%

The improved properties and microstructure of β-solidify TiAl alloys by boron addition and multi steps forging process

Xiao

Chen

et al. 2019

Sci Rep

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A novel forging process has been designed for better mechanical properties of Ti-43Al-6Nb-1Mo-1Cr-(0,0.6)B alloys in this paper. Multi step forging process could provide much finer microstructure, higher room-temperature strength, increased high-temperature strength and elongation with these alloys. The forged alloys without boron exhibit strength and elongation as 676.05 ± 11.37 MPa and 41.32 ± 1.38% at 800 °C, while the average grain size represents as 12.63 ± 3.77 μm. The forged alloys with 0.6 at.% B represent better mechanical properties than the forged alloys without boron, due to the refined microstructure with dispersive borides. Meanwhile, the detailed mechanism of increased strength and elongation caused by finer microstructure were concluded and discussed.

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Section: Resultsmentioning

confidence: 99%

The improved properties and microstructure of β-solidify TiAl alloys by boron addition and multi steps forging process

Xiao

Chen

et al. 2019

Sci Rep

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“…Ever since severe plastic deformation (SPD) was demonstrated as a practical approach to produce ultrafine-grained (UFG) metals [5], extensive research has been carried out to develop SPD techniques [6]. Several SPD processing techniques have been developed and reported, such as equal-channel angular pressing (ECAP) [7], high-pressure torsion (HPT) [8], multidirectional isothermal forging (MDIF) [9], and accumulative roll bonding (ARB) [10]. In recent years, multidirectional isothermal forging (MDIF) has been successfully applied for grain refinement and performance enhancement of magnesium [11], Ti-6Al-4V [12], Ti-48Al-2Nb-2Cr [13], and other alloys [14,15], since it has a simple process and low manufacturing cost.…”

Section: Introductionmentioning

confidence: 99%

Effect of Multidirectional Isothermal Forging on Microstructure and Mechanical Properties in Ti-6Al-4V Alloy

Yang

Fan

et al. 2022

Materials

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In the present work, the microstructure and mechanical properties of Ti-6Al-4V alloy during multidirectional isothermal forging (MDIF) were systematically investigated. The evolution of the microstructure and texture of Ti-6Al-4V alloy during MDIF was studied using TEM and electron backscattered diffraction (EBSD). The experiment results showed that the grain size decreased with the increase in cumulative strain, especially in the easy deformation zone. After four deformation cycles, a homogeneous equiaxed grained microstructure with an average grain size of 0.14 μm was achieved. The texture changes of the alloy were studied in detail. After one cycle of MDIF, the texture was mainly composed of (0002) [01 10], and the Euler angles were (8°, 30°, 30°). The density of texture decreased with the increase in loading cycle, but the dispersion of texture increased. After four cycles of MDIF, the non-basal texture (1010) <1102> texture was observed, and the Euler angles were (82°, 33°, 0°). The highest achieved mechanical properties for Ti-6Al-4V alloy in the MDIF condition were a yield strength 900 MPa, ultimate tensile strength of 921 MPa, and an elongation of 12.1% at room temperature. The increase in MDIF cycles improved the hardness of the alloy. The significant improvement in mechanical properties was attributed to the ultrafine-grained microstructure.

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“…TiAl has low density, high melting point, good corrosion resistance, excellent oxidation performance, and creep resistance [4][5][6]. Anyway, this intermetallic material suffers from low-temperature ductility and poor formability [7][8][9][10]. Spark plasma sintering (SPS) has been used to overcome the poor low-temperature ductility of TiAl.…”

Section: Introductionmentioning

confidence: 99%

Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part I: sintering and densification

et al. 2021

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Five TiAl–Ti3AlC2 composite samples containing (10, 15, 20, 25 and 30 wt% Ti3AlC2 MAX phase) were prepared by spark plasma sintering technique at 900 °C for 7 min under 40 MPa. For this purpose, metallic titanium and aluminum powders (aiming at the in-situ formation of the TiAl matrix phase) were ball-milled with predetermined contents of Ti3AlC2 MAX phase, which already was synthesized using the same metallic powders as well as graphite flakes. Displacement-time-temperature variations during the heating and sintering steps, displacement rate versus temperature, displacement rate versus time, and densification behavior were studied. Two sharp changes were detected in the diagrams: the first one, ~16 min after the start of the heating process due to the melting of Al, and the second one, after ~35 min because of the sintering progression and the applied final pressure. The highest relative densities were measured for the samples doped with 20 and 25 wt% Ti3AlC2 additives. More Ti3AlC2 addition resulted in decreased relative density because of the agglomeration of MAX phase particles.

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Microstructural evolution of TiAl-based alloys deformed by high-pressure torsion

Cited by 38 publications

References 47 publications

The improved properties and microstructure of β-solidify TiAl alloys by boron addition and multi steps forging process

The improved properties and microstructure of β-solidify TiAl alloys by boron addition and multi steps forging process

Effect of Multidirectional Isothermal Forging on Microstructure and Mechanical Properties in Ti-6Al-4V Alloy

Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part I: sintering and densification

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