A study on the microstructures and mechanical properties of Ti–B20–0.1B alloys of direct rolling in the α + β phase region

Huang, Lujun; Chen, Yuyong

doi:10.1016/j.jallcom.2015.05.244

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…Near β titanium alloys possess extremely high strength due to precipitation of finely dispersed intragranular α precipitates [10]. However, the improvement of strength is usually accompanied by a decrease in ductility, resulting from unexpected microstructural characteristics, such as grain boundary α [11,12]. Generally, an excellent combination of strength and ductility is strongly dependent on size, morphology, and distribution of secondary α phase [13].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

et al. 2018

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Evolution of secondary α phase during aging treatment of a novel near β titanium alloy Ti-6Mo-5V-3Al-2Fe(wt.%) was studied by OM, SEM, and TEM. Results indicated that size and distribution of secondary α phase were strongly affected by aging temperature and time. Athermal ω phase formed after super-transus solution treatment followed by water quenching, and promoted nucleation of needle-like intragranular α in subsequent aging process. When aged at 480 °C, fine scaled intragranular α with small inter-particle spacing precipitated within β grains and high ultimate tensile strength above 1500 MPa was achieved. When the aging temperature increased, the size and inter-particle spacing of intragranular α increased and made the strength reduce, but the ductility got improved. When aging temperature reached as high as 600 °C, ω phase disappeared and intragranular α coarsened obviously, resulting in serious decrease of strength. While mutually parallel Widmanstätten α laths formed at the vicinity of β grain boundaries and grew into the internal area of β grains, and significant improvement of ductility was achieved. As the aging time increased from 4 h to 16 h at 600 °C, the intragranular α grew slightly and brought about minor change of mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

et al. 2018

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“…For example, α 2 phase precipitated from α phase, and an elliptical S 2 silicide was formed at the interface of α / β phases when TiBw/Ti60 was aged at 700°C for 5 h (Wang et al , 2015a). The volume fraction of α 2 in Ti-B20-0.1B increased by 50 per cent after aging, leading to a significant increase in the alloy’s strength (Huang and Chen, 2015). Aging time, as well as temperature, has an effect on the mechanical properties of the alloy formed.…”

Section: Development Of High Strength Near-α Titanium Alloysmentioning

confidence: 99%

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Tabie

Wang

et al. 2020

AEAT

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Purpose This paper aims to present a broad review of near-a titanium alloys for high-temperature applications. Design/methodology/approach Following a brief introduction of titanium (Ti) alloys, this paper considers the near-α group of Ti alloys, which are the most popular high-temperature Ti alloys developed for a high-temperature application, particularly in compressor disc and blades in aero-engines. The paper is relied on literature within the past decade to discuss phase stability and microstructural effect of alloying elements, plastic deformation and reinforcements used in the development of these alloys. Findings The near-a Ti alloys show high potential for high-temperature applications, and many researchers have explored the incorporation of TiC, TiB SiC, Y2O3, La2O3 and Al2O3 reinforcements for improved mechanical properties. Rolling, extrusion, forging and some severe plastic deformation (SPD) techniques, as well as heat treatment methods, have also been explored extensively. There is, however, a paucity of information on SiC, Y2O3 and carbon nanotube reinforcements and their combinations for improved mechanical properties. Information on some SPD techniques such as cyclic extrusion compression, multiaxial compression/forging and repeated corrugation and straightening for this class of alloys is also limited. Originality/value This paper provides a topical, technical insight into developments in near-a Ti alloys using literature from within the past decade. It also outlines the future developments of this class of Ti alloys.

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“…As a new type of metastable β-titanium alloy, the phase transformation mechanism of the Ti-3.5Al-5Mo-4V alloy is similar to that of the same type of metastable β-titanium alloy; however, the particularity of its critical value molybdenum equivalent inevitably leads to its phase transformation mechanism being different from that of a general metastable β-titanium alloy. At the same time, the current research on Ti-3.5Al-5Mo-4V alloys has mainly focused on thermal deformation and single-stage ageing heat treatment [ 23 , 24 ]. To improve the mechanical properties of Ti-3.5Al-5Mo-4V alloys and expand their application in aerospace and other fields, it is necessary and significant to study the rule of microstructure evolution during the double-stage aging process.…”

Section: Introductionmentioning

confidence: 99%

Effects of Double-Ageing Heat Treatments on the Microstructure and Mechanical Behaviour of a Ti-3.5Al-5Mo-4V Alloy

Xiang

et al. 2021

Materials

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In this work, the effect of double-ageing heat treatments on the microstructural evolution and mechanical behaviour of a metastable β-titanium Ti-3.5Al-5Mo-4V alloy is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The double-ageing treatments are composed of low-temperature pre-ageing and high-temperature ageing, where the low-temperature pre-ageing is conducted at 300 °C or 350 °C for different times, and the high-temperature ageing is conducted at 500 °C for 8 h. The results show that the phase transformation sequence is altered with the time spent during the first ageing stage, the isothermal ω phase is precipitated in the pre-ageing process of the alloy at 300 °C and 350 °C with the change in the ageing time, and the ω phase is finally transformed into the α phase with the extension of pre-ageing time. The existence time of the ω phase is shortened as the pre-ageing temperature increases. The microhardness of the alloy increases with increasing pre-ageing time and temperature. Compared with single-stage ageing, the ω phase formed in the pre-ageing stage changes the response to subsequent high-temperature ageing. After the two-stage ageing treatment, the precipitation size of the α phase is obviously refined after the double-ageing treatment. A microhardness test shows that the microhardness of the two-stage aged alloy increases with extended pre-ageing time.

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A study on the microstructures and mechanical properties of Ti–B20–0.1B alloys of direct rolling in the α + β phase region

Cited by 14 publications

References 33 publications

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Effects of Double-Ageing Heat Treatments on the Microstructure and Mechanical Behaviour of a Ti-3.5Al-5Mo-4V Alloy

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