Microstructural study of the titanium alloy Ti-15Mo-2.7Nb-3Al-0.2Si (TIMETAL 21S)

Chaudhuri, Kaustav; Perepezko, John H.

doi:10.1007/bf02652286

Cited by 42 publications

(25 citation statements)

References 23 publications

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“…As a result, the matrix becomes more stable and the driving force for subsequent aging decreases. 55,83 The second aging step increases strength via precipitation of finer alpha phase, albeit to lower levels than single stage aging, as noted in Table VI. A typical duplex aged microstructure is provided in Fig.…”

Section: Microstructure and Propertiesmentioning

confidence: 96%

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State of the Art in Beta Titanium Alloys for Airframe Applications

Cotton

Briggs

Boyer³

et al. 2015

JOM

343

140

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Beta titanium alloys were recognized as a distinct materials class in the 1950s, and following the introduction of Ti-13V-11Cr-3Al in the early 1960s, intensive research occurred for decades thereafter. By the 1980s, dozens of compositions had been explored and sufficient work had been accomplished to warrant the first major conference in 1983. Metallurgists of the time recognized beta alloys as highly versatile and capable of remarkable property development at much lower component weights than steels, coupled with excellent corrosion resistance. Although alloys such as Ti-15V-3Al-3Sn-3Cr, Ti-10V-2Fe-3Al and Ti-3AI-8V-6Cr-4Mo-4Zr (Beta C) were commercialized into well-known airframe systems by the 1980s, Ti-13V-11Cr-3Al was largely discarded following extensive employment on the SR-71 Blackbird. The 1990s saw the implementation of specialty beta alloys such as Beta 21S and Alloy C, in large part for their chemical and oxidation resistance. It was also predicted that by the 1990s, cost would be the major limitation on expansion into new applications. This turned out to be true and is part of the reason for some stagnation in commercialization of new such compositions over the past two decades, despite a good understanding of the relationships among chemistry, processing, and performance and some very attractive offerings. Since then, only a single additional metastable beta alloy, Ti-5Al-5V-5Mo-3Cr-0.5Fe, has been commercialized in aerospace, although low volumes of other chemistries have found a place in the biomedical implant market. This article examines the evolution of this important class of materials and the current status in airframe applications. It speculates on challenges for expanding their use.

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Section: Microstructure and Propertiesmentioning

confidence: 96%

“…84,85 riors. Ti 5 Si 3 silicides have also been reported in Beta 21S, 83 although it is very fine and not visible by light optical methods.…”

Section: Microstructure and Propertiesmentioning

confidence: 99%

State of the Art in Beta Titanium Alloys for Airframe Applications

Cotton

Briggs

Boyer³

et al. 2015

JOM

343

140

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“…The atomic mobility Mi is suggested by Andersson and Ågren first [16] and later modified by Jönsson [17], which is expressed as where is the activation energy, is the frequency factor, T is the temperature and R is the gas constant, and is the effect of ferromagnetic ordering. If there is no ferromagnetic effect, we combined the first two parts of the mobility parameter into a single parameter, i.e., .…”

Section: Model Descriptionmentioning

confidence: 99%

“…The ternary Ti-Al-Mo system is an important base system of many titanium alloys such as Ti-5553 [15] and β-21S [16]. Due to the missing of the mobility database, the aim of this work is to assess the atomic mobility for the bcc phase of the Ti-Al-Mo ternary system by using the DICTRA software, and finally obtain the diffusion characteristic of the Ti-Al-Mo system with simulation of some diffusion couples by applying the acquired atomic mobility parameters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Atomic Mobility for the Bcc Phase of the Ti-Al-Mo System

Chen

Cheng

Zhang

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The atomic mobility for the bcc phase of the Ti-Al-Mo ternary system was developed by critical assessment of the experimental diffusion data by using the DICTRA software. The results shown the calculated diffusion coefficients presented the good agreements by the comprehensive comparisons with the experimental diffusion coefficients. The developed Ti-Al-Mo ternary atomic mobility was then subsequently validated by appropriate prediction of the interdiffusion behavior with comparison of the diffusion-couple experiments in the literature. Introductionβ titanium alloy exhibits excellent formability thanks to its sustainability of 100% β when quenched from β phase area [1], yet offers significantly higher strengths by separating out the α phase when aged at α+β phase area [2,3], which are widely used in aerospace and automotive industries [1][2][3]. The microstructure of the β-Ti alloys are largely depended on the recrystallization, phase transformation and grain growth process, while much of these processes are governed by the diffusion interaction [4-6] during thermomechanical processing and the follow heat treatment. Therefore, knowledge of diffusion kinetics is critical to understand the influence of alloying additions, schedule and optimize the heat treatment parameters and control of microstructural development for new type Ti-based alloys.Nowadays, by combined with computational thermodynamics, the computational diffusion kinetics [7,8] can predict the kinetic process of high quality for many commercially important alloy systems by using the DICTRA software, in which the atomic mobility database of the alloy system should be used [8]. More importantly, the mobility database can be applied for simulation the full diffusion picture of titanium alloys of interest without extra experimental measurements by combining the CALPHAD-base (Calculation of Phase Diagram) thermodynamic database [11][12][13][14].The ternary Ti-Al-Mo system is an important base system of many titanium alloys such as Ti-5553 [15] and β-21S [16]. Due to the missing of the mobility database, the aim of this work is to assess the atomic mobility for the bcc phase of the Ti-Al-Mo ternary system by using the DICTRA software, and finally obtain the diffusion characteristic of the Ti-Al-Mo system with simulation of some diffusion couples by applying the acquired atomic mobility parameters.

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“…Fe causes simple solution strengthening in β-alloys [12], whereas Si contributes to hardening via the creation of dispersed precipitates (Ti,Zr) 5 Si 3 [13,14]. Si contents of 0.20.4 wt% is often utilized in high-strength * corresponding author; e-mail: josef.strasky@gmail.com and high-temperature alloys in aerospace industry in order to increase the strength and to suppress excessive creep [15,16] All alloys were prepared by arc melting of pure elements under a low pressure of clean He (350 mbar) Each part of the sample was remelted at least six times by electric arc to ensure homogeneity. Samples of approximate weight 200 g were subsequently homogenized at 1400…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Plastic Deformation in Ti-Nb-Zr-Ta Based Biomedical Alloys with Fe and Si Content

et al. 2015

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Specialized beta titanium alloys containing biocompatible elements (Nb, Zr, Ta) are increasingly considered as a material for orthopaedic implants. In this study, small additions of Fe and Si are used to increase the strength of commercial Ti35Nb7Zr5Ta (TNZT) alloy. Six dierent advanced alloys with iron content up to 2 wt% and silicon content up to 1 wt% were manufactured by arc melting and hot forging. Flow curves were determined from tensile tests carried out at room temperature. The yield stress is increased from 450 MPa to 700 MPa due to small Fe and Si additions. Fe causes solid solution strengthening exhibited by sharp yield point and signicant work hardening. (Ti,Zr)5Si3 intermetallic particles further increase the strength via precipitation hardening. An unusual serrated yielding behaviour of benchmark TNZT alloy is caused by twinning as shown by acoustic emission measurement and electron backscattered diraction analysis.

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Microstructural study of the titanium alloy Ti-15Mo-2.7Nb-3Al-0.2Si (TIMETAL 21S)

Cited by 42 publications

References 23 publications

State of the Art in Beta Titanium Alloys for Airframe Applications

State of the Art in Beta Titanium Alloys for Airframe Applications

Assessment of Atomic Mobility for the Bcc Phase of the Ti-Al-Mo System

Mechanisms of Plastic Deformation in Ti-Nb-Zr-Ta Based Biomedical Alloys with Fe and Si Content

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