Thermomechanical processing of near-β Ti–5Al–5Mo–5V–1Cr–1Fe alloys: Effect of deformation reduction on microstructures and mechanical properties

Yin, Ming; Luo, Hengjun; Deng, Hao; Chen, Lei; Qiu, Wenbin

doi:10.1016/j.msea.2022.143786

Cited by 11 publications

(3 citation statements)

References 23 publications

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“…During the deformation process of coarse α-phase layers, dislocation slip, dislocation intersection, and dislocation entanglement occur, and eventually fracture occurs under the action of shear force. In Figure 6b, it can be clearly seen that the coarse α-phase layer is elongated along the length direction and shrinks along the width direction, and, finally, it is cut along the slip direction (45 • to the length direction) [31].…”

Section: Resultsmentioning

confidence: 99%

Effect of Aging Temperature on the Microstructure and Mechanical Properties of a Novel β Titanium Alloy

Xiang,

Yuan,

Deng

et al. 2023

Materials

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High-strength metastable β titanium alloys are promising structural materials to be used in aviation industries. In order to achieve a high strength level, solid solution treatment within β region and subsequent low-temperature aging are usually necessary to obtain fine α precipitates. The selection of the aging temperature is considered critical to the mechanical performance of metastable β titanium alloys. In this work, we investigated the effect of aging temperature on the microscopic structure and mechanical properties of a novel type of titanium alloy TB18 (Ti-4.5Al-5Mo-5V-6Cr-1Nb). A series of aging treatments were conducted on TB18 specimens at 510 °C, 520 °C, 530 °C, and 540 °C after the solid solution treatment at 870 °C. On the basis of the systematic results of scanning electron microscope and transmission electron microscope, the behavior of the α phases affected by the varied aging temperatures were studied. As the aging temperature rose, the grain width of the α phase increased from 60 nm (510 °C) to 140 nm (540 °C). For the TB18 samples aged at 510 °C and 540 °C, the tensile strength/yield strength/impact toughness values were 1365 ± 3 MPa/1260 ± 0.9 MPa/26.5 ± 1.2 J/cm2 and 1240 ± 0.9 MPa/1138 ± 0.8 MPa/36.2 ± 1.3 J/cm2, respectively. As a result, the tensile performance and the grain width of the α phase agreed well with the Hall–Petch relationship. This work offers valuable support for both theoretical analyses and the heat treatment strategies on the novel TB18 titanium alloy.

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Section: Resultsmentioning

confidence: 99%

Effect of Aging Temperature on the Microstructure and Mechanical Properties of a Novel β Titanium Alloy

Xiang,

Yuan,

Deng

et al. 2023

Materials

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“…There is a sharp increase in ductility (~15.1%). Yin et al [43] reported that the highest acceptable YS and UTS are 1023 and 1122 MPa in an aged TC18 alloy, respectively, with an excellent ductility of 13.8%. They asserted that the excellent ductility is attributed to the large-size and high-volume fraction of the α p phase.…”

Section: Tensile Properties Of the Aged Tc18 Alloymentioning

confidence: 99%

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

Zhang,

Lin,

Wang

et al. 2024

Materials

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In the present work, the effects of aging treatment on the microstructures of a TC18 alloy are studied. The influence of aging treatment on the tensile properties and failure mechanisms is systematically analyzed. It is found that the size and morphology of the primary α (αp) phases are insensitive to aging temperature and time. Furthermore, the aging temperature and time dramatically influence the precipitation of the secondary α (αs) phases. Massive αs phases precipitate and gradually coarsen, and finally weave together by increasing the aging temperature or extending the aging time. The variations in αp and αs phases induced by aging parameters also affect the mechanical properties. Both yield strength (YS) and ultimate tensile strength (UTS) first increase and then decrease by increasing the aging temperature and time, while ductility first decreases and then increases. There is an excellent balance between the strengths and ductility. When the aging temperature is changed from 450 to 550 °C, YS varies from 1238.6 to 1381.6 MPa, UTS varies from 1363.2 to 1516.8 MPa, and the moderate elongation ranges from 9.0% to 10.3%. These results reveal that the thickness of αs phases is responsible for material strengths, while the content of α phases can enhance material ductility. The ductile characteristics of the alloy with coarser αs phases are more obvious than those with thinner αs phases. Therefore, the aging treatment is helpful for the precipitation and homogeneous distribution of αs phases, which are essential for balancing the strengths and ductility of the studied Ti alloy.

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“…[1][2][3] In recent decades, near-β-Ti alloys have been widely studied for tailoring microstructure and mechanical properties. [4][5][6][7] It is commonly accepted that their mechanical properties are highly dependent on the shape, size, distribution, and volume fraction of α phase. [8] Lamellar microstructure was usually obtained by conventional aging treatments below the β transus temperature.…”

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Microstructure Evolution and Deformation Mechanism of Ti‐55531 Alloy During Hot‐Rolling Process

Wen,

Xin,

Huang

et al. 2023

Adv Eng Mater

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Ti‐55531 alloy is a novel near‐β‐Ti alloy, which has promising application potential as critical aircraft components due to its outstanding mechanical properties. In this work, it is aimed to tailor the microstructure and mechanical properties of Ti‐55531 alloy by hot‐rolling in α + β‐phase field. In experimental results, it is indicated that an increasing number of α lamellae becomes globular or ellipsoidal shape with the increase of rolling reduction. As a result, the strength and elongation of the rolled samples continually increase. Lath‐like substructures are observed inside some residual lamellar α after 20% rolling reduction. Nearly all lath‐like substructures have their habit plane corresponding to (100)α and exhibit the orientation relationship (OR) of [0001]HCP //[001]FCC, [20]HCP //[]FCC, and (100)HCP //(FCC with α phase. At high rolling reductions, the face‐centered cubic (FCC) substructures disappeared. Instead, {101} twin structures are frequently observed in lamellar α grains, indicating that both {101} twinning and martensitic transformation can be activated in Ti‐55531 alloy to accommodate the applied rolling deformation. To the authors’ knowledge, such stress‐induced martensitic transformation has not been reported before in Ti‐55531 alloy. Therefore, the findings in this work should advance the understandings on the deformation behavior and mechanism in this alloy.

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Thermomechanical processing of near-β Ti–5Al–5Mo–5V–1Cr–1Fe alloys: Effect of deformation reduction on microstructures and mechanical properties

Cited by 11 publications

References 23 publications

Effect of Aging Temperature on the Microstructure and Mechanical Properties of a Novel β Titanium Alloy

Effect of Aging Temperature on the Microstructure and Mechanical Properties of a Novel β Titanium Alloy

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

Microstructure Evolution and Deformation Mechanism of Ti‐55531 Alloy During Hot‐Rolling Process

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