Metastable phase diagram on heating in quenched Ti-Nb high-temperature shape memory alloys

Zhang, J.; Li, Yanjie; Li, Wei

doi:10.1007/s10853-021-05814-4

Cited by 13 publications

(9 citation statements)

References 45 publications

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“…Furthermore, our findings of reduced martensitic grain size with increased cooling rate were consistent with the literature [10,11]. However, an insufficiently high cooling rate may also lead to ω phase formation, though this was not observed here [11,42,43]. Our results showed that heat treatment to the β phase followed by water quenching influenced the phase and microstructure of Ti-Nb alloys fabricated by SPS.…”

Section: Discussionsupporting

confidence: 92%

“…These phases exhibited higher hardness of both α and β structures, as well as solid solution strengthening by Nb addition [9]. Highest hardness was recorded at 25–30 wt-% (14.7–18.1 at.-%) Nb because of ω phase formation [9,11,42,43]. Results also showed that trends of yield strength and ultimate tensile strength were consistent with hardness, and primarily influenced by their phases.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Nb Content and water quenching on microstructure and mechanical properties of Ti-Nb alloys fabricated by spark plasma sintering

et al. 2022

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Titanium-niobium (Ti-Nb) alloys have been extensively studied for medical implants due to their advantageous mechanical properties and biocompatibility. However, the stress shielding effect remains a challenge. This research investigated the effects of Nb content and enhancement of α ′′ formation on the mechanical properties of Ti-xNb alloys (x = 0, 5, 15 and 25%) fabricated by spark plasma sintering. Water quenching from the β phase induced α ′′ phase formation in Ti-5Nb and Ti-15Nb samples, thereby reducing their Young's modulus values but was not observed in commercially pure titanium (CP-Ti) and Ti-25Nb. Results showed that heat treatment with water quenching induced α ′′ phase formation and can be used to tailor the properties of Ti-Nb alloys fabricated by SPS. This technique can also be used to enhance material ductility at high β-stabilizer content, as observed in Ti-25Nb samples.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Effect of Nb Content and water quenching on microstructure and mechanical properties of Ti-Nb alloys fabricated by spark plasma sintering

et al. 2022

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“…All samples of Ti-18Nb alloys also exhibit the phases, and a trace amount of martensite. Jian Zhang et al [15] Examined changes in phase upon heating at various heating rates in quenched Ti-(16-25%) Nb HTSMAs were characterized. In contrast, (the beginning temperature of the α''→β transition) does not grow linearly with decreasing Nb-content.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb Content on Behavior of (Ti-Nb) Shape Memory Alloys for Biomedical Applications

2024

jjmie

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Titanium-niobium (Ti-Nb) binary alloys have lately been given attention and attraction due to their non-toxic properties and low Young's modulus. All alloys manufactured by powder metallurgy and studied through the influence of Nb content (13, 14, 15, 23, 24 and 25) at% on the shape memory effect, the surfaces properties (Vickers microhardness, Contact angle (CA), Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD), DSC and Corrosion resistance (in Hank solution) of Ti-xNb alloys). The results of XRD illustrated that the (Ti-xNb) alloys included α″ and β Ti phases, such that as the amount of Nb in the alloy increased the β phase increased proportionately. Regarding the shape memory effect (SME%) of alloys, the treatment was determined by using microhardness after and before the heat treatment, according to the result of DSC test, by two different temperature (50 and 150) ºC in which the result was far less than 5%.All Ti-xNb alloys displayed noticeably higher hardness, compressive strength and decreased contact angle, low Corrosion was founded on Ti-xNb alloys in hank solutions. In overall, binary Ti-xNb at% alloys are a suitable candidate for dental and orthopedic implants owing to their enhanced mechanical characteristic and Biological performance that is comparable.

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“…Indeed, there have been significant advances in theoretical and experimental techniques in recent years that allow to probe the microscopic mechanisms of defect-characterized phase transition kinetics. [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] Conceptually, the idea of "defect phases" has recently been proposed, 63 which focuses more on the thermodynamic aspects. In this review, we will use selected examples to demonstrate the various roles that defects can play in phase transition kinetics.…”

Section: Introductionmentioning

confidence: 99%

Defect-characterized phase transition kinetics

Zhang

Wang

et al. 2022

Applied Physics Reviews

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Phase transitions are a common phenomenon in condensed matter and act as a critical degree of freedom that can be employed to tailor the mechanical or electronic properties of materials. Understanding the fundamental mechanisms of the thermodynamics and kinetics of phase transitions is, thus, at the core of modern materials design. Conventionally, studies of phase transitions have, to a large extent, focused on pristine bulk phases. However, realistic materials exist in a complex form; their microstructures consist of different point and extended defects. The presence of defects impacts the thermodynamics and kinetics of phase transitions, but has been commonly ignored or treated separately. In recent years, with the significant advances in theoretical and experimental techniques, there has been an increasing research interest in modeling and characterizing how defects impact or even dictate phase transitions. The present review systematically discusses the recent progress in understanding the kinetics of defect-characterized phase transitions, derives the key mechanisms underlying these phase transitions, and envisions the remaining challenges and fruitful research directions. We hope that these discussions and insights will help to inspire future research and development in the field.

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Metastable phase diagram on heating in quenched Ti-Nb high-temperature shape memory alloys

Cited by 13 publications

References 45 publications

Effect of Nb Content and water quenching on microstructure and mechanical properties of Ti-Nb alloys fabricated by spark plasma sintering

Effect of Nb Content and water quenching on microstructure and mechanical properties of Ti-Nb alloys fabricated by spark plasma sintering

Effect of Nb Content on Behavior of (Ti-Nb) Shape Memory Alloys for Biomedical Applications

Defect-characterized phase transition kinetics

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