Microstructure and tensile properties of hot fogred high Nb containing TiAl based alloy with initial near lamellar microstructure

Zhang, S.Z.; Zhang, C.J.; Du, Zhongjie; Hou, Zhaoping; Peng, Lin; Chen, Y.Y.

doi:10.1016/j.msea.2015.06.066

Cited by 38 publications

(6 citation statements)

References 37 publications

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“…The dependence of strength and elongation on temperature is summarized in Figure 6. The RT tensile strength is about 726 MPa, which is higher than that of the Cr- and Mn-containing TiAl alloys [31], but lower than that of high-Nb-containing TiAl alloys [32]. The RT elongation is about 1.5%, which is close to that of the TiAl alloys with low β phase content.…”

Section: Resultsmentioning

confidence: 95%

The Microstructural Evolution, Tensile Properties, and Phase Hardness of a TiAl Alloy with a High Content of the β Phase

Cui

Yan

et al. 2019

Materials

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In this paper, the microstructure, deformability, tensile properties, and phase hardness of the Ti–43Al–2Cr–0.7Mo–0.1Y alloy with a high β phase content were investigated. Microstructural analysis showed that the β phase precipitated not only at the colony boundaries but also inside the lamellae due to its high content. A high-quality forging stock was prepared through one-step noncanned forging. The total deformation reached above 80%, suggesting that the alloy has good hot deformability compared to other TiAl alloys. The deformed microstructure was composed of fine and equiaxed grains due to dynamic recrystallization. The high β phase content was shown to contribute to the decomposition of the initial coarse lamellae. Tensile testing showed that the alloy has good room-temperature ductility, even if the β phase content reaches above 20%. This is inconsistent with a previous study that showed that a large amount of the hard β phase is detrimental to the room-temperature ductility of TiAl alloys. Nanoindentation testing showed that the hardness of the β phase in the current alloy is about 6.3 GPa, which is much lower than that in the Nb-containing TiAl alloys. Low hardness benefits the compatible deformation among various phases, which could be the main reason for the alloy’s good room-temperature ductility. Additionally, the influence of various β stabilizers on the hardness of the β phase was also studied. The β phase containing Nb had the highest hardness, whereas the β phase containing Cr had the lowest hardness.

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Section: Resultsmentioning

confidence: 95%

The Microstructural Evolution, Tensile Properties, and Phase Hardness of a TiAl Alloy with a High Content of the β Phase

Cui

Yan

et al. 2019

Materials

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“…TiAl-based alloys have justifiably attracted much attention as new promising structure materials in aerospace and automotive industries in recent years due to their low density, high specific strength and modulus, superior oxidation resistance, and creep resistance in comparison with other conventional hightemperature alloys [1][2][3][4]. Primarily, TiAl-based alloy sheets can be used to manufacture several structural components, such as hollow turbine blades and honeycomb structures [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and dynamic softening behavior of as-forged Ti-43Al-9V-Y-0.2Y alloy under different deformation parameters

Xu¹,

Wang²,

Zhang³

et al. 2020

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The dynamic recrystallization (DRX) mechanism and microstructure evolution of the asforged Ti-43Al-9V-Y-0.2Y alloy were investigated by plane strain compression tests under different deformation conditions. The results show that the strain rate has little influence on the microstructure components of present alloy, whereas a large amount of γ-phase undergoes γ → α2-phase transformation with the total reduction from 40 to 60 % at a constant strain rate. Additionally, DRX and deformation twinning are the primary dynamic softening mechanisms of present alloy. The extent of DRX increases with the decreasing strain rate and increasing total reduction. Meanwhile, twin boundaries (TBs) are observed in γ-phase of all the samples, which provides coordinated deformation for non-uniform deformation of present alloys. The fraction of TBs reduces from 9.51 to 0.657 % with the increase of strain rate, and rises from 0.657 to 1.05 % with the increase of total reduction, testifying that TBs are connected with DRX nucleation. At the same time, the trend of pseudo twin boundaries (PTBs) content is similar to that of TBs, which is also related to the strain rate and total reduction. Besides, many fine DRX grains located around the TBs and PTBs further explain that the TBs and PTBs promote DRX nucleation. The fiber intensity peak value decreases, and the fiber distribution disperses in the pole figure of α2-phase after DRX.

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“…[5][6][7] Many works have been performed to investigate the strengthening of TiAl intermetallic compounds. [8][9][10][11][12][13][14][15][16][17][18] And considerable investigations have shown that incorporation of second phase and micro-alloying are doable and resultful to control the microstructure and improve the mechanical properties of TiAl intermetallics. [10][11][12][13][14][15][16][17][18] On one hand, ceramic particles, for instance, Si 3 N 4 , 10 TiB 2 , TiC, 11 Al 2 O 3 13 as well as Ti 5 Si 3 15 as effective reinforcements have been performed in many researches.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

2017

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composites were successfully synthesized utilizing in situ reactive hot pressing method with Ti, Al, and MoO 3 powders as starting materials. A possible synthesis mechanism was proposed to explain the formation of (Ti,Mo)Al/Al 2 O 3 composites. The investigation results indicate a probable reaction process that molten Al reacted with MoO 3 to form Al 2 O 3 and Mo, and the TiAl matrix grains were refined increasingly by Al 2 O 3 with the addition of MoO 3 increased, accompanying with a small quantity of Mo containing phase AlMoTi 2 formed in the fabricated composites. Meanwhile, the microstructure and mechanical properties of the (Ti,Mo) Al/Al 2 O 3 composites were characterized. The as-synthesized composites exhibited lamellar structure of TiAl intermetallic compound and the in situ formed fine Al 2 O 3 particles dispersed at the stratified TiAl matrix grain boundaries hindering the growth of the grain size of the matrix. And the Rockwell hardness, flexural strength, and fracture toughness of the as-prepared (Ti,Mo) Al/Al 2 O 3 composite were 44.08 HRC, 684 MPa, 7.63 MPaÁm 1/2 , which improved by 57.4%, 107.3%, and 38.7% compared to monolithic TiAl, respectively. The reinforcing mechanism of the material was also discussed.

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Microstructure and tensile properties of hot fogred high Nb containing TiAl based alloy with initial near lamellar microstructure

Cited by 38 publications

References 37 publications

The Microstructural Evolution, Tensile Properties, and Phase Hardness of a TiAl Alloy with a High Content of the β Phase

The Microstructural Evolution, Tensile Properties, and Phase Hardness of a TiAl Alloy with a High Content of the β Phase

Microstructure evolution and dynamic softening behavior of as-forged Ti-43Al-9V-Y-0.2Y alloy under different deformation parameters

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing

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Microstructure and tensile properties of hot fogred high Nb containing TiAl based alloy with initial near lamellar microstructure

Cited by 38 publications

References 37 publications

The Microstructural Evolution, Tensile Properties, and Phase Hardness of a TiAl Alloy with a High Content of the β Phase

The Microstructural Evolution, Tensile Properties, and Phase Hardness of a TiAl Alloy with a High Content of the β Phase

Microstructure evolution and dynamic softening behavior of as-forged Ti-43Al-9V-Y-0.2Y alloy under different deformation parameters

Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al2O3in situ composites by reactive hot pressing

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Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃in situ composites by reactive hot pressing