Compositionally gradient Ti-Ta metal-metal composite with ultra-high strength

Xu, Shenghang; Liu, Yong; Yang, Chao; Zhao, Henglv; Liu, Bin; Li, Jianbo; Song, Min

doi:10.1016/j.msea.2017.11.089

Cited by 36 publications

(6 citation statements)

References 31 publications

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“…Nevertheless, the sample with 30 vol.-% of Ta shows a different microstructure, since α-Ti phase (the darker phase) is segregated at the grain boundaries (Figure 6 (d)). Inside the grains it is observed a needle-like microstructure, which is associated to the α ′ -Ti martensite phase [43,44]. This observation confirms the previous X-ray diffraction analysis.…”

Section: Sem Observationsupporting

confidence: 89%

“…This observation confirms the previous X-ray diffraction analysis. The same phase has also been obtained in Ti–Ta alloys produced by casting after a quenching at higher cooling rates [44,45]. Otherwise, the microstructure obtained in Ti–Ta alloys produced by powder metallurgy usually shows the β-Ti phase with α-Ti segregated at the grain boundaries [27], i.e.…”

Section: Resultsmentioning

confidence: 68%

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Synthesis and characterisation of Ti6Al4V/xTa alloy processed by solid state sintering

et al. 2020

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This work investigates the effect of Ta particle addition into a Ti6Al4V alloy processed by solid state sintering. The volume fraction of Ta ranged between 0 and 30 vol.-%. The sintering kinetics of powder mixes are evaluated by dilatometry. Sintered materials are characterised by SEM and XRD, and their mechanical properties are obtained from microhardness and compression tests. Sintering behaviour and final microstructure are affected by Ta particles, which slow down the densification, lower the temperature of α-to-β phase transition and stabilise the β phase. Mechanical properties, as microhardness, Young's modulus and yield stress, depend on the microstructure reached after sintering and on the residual porosity. An equation expressing the Young's modulus of Ti6Al4V/xTa alloy as function of x and porosity is proposed and validated. The materials with at least 20 vol.-% of Ta exhibited a high strength to modulus ratio, which is suitable for orthopaedic implants.

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Section: Sem Observationsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 68%

Synthesis and characterisation of Ti6Al4V/xTa alloy processed by solid state sintering

et al. 2020

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“…It is well known that stress induced martensitic phase transformation (SIMT) can also mediate plasticity in titanium alloys [45,46]. In our previous work [47], martensitic transformation only happened when the content of Ta varied from 15 to 28 at%, and the composition of R-Ti is right located in this region. Therefore, we also performed in situ tensile tests under synchrotron radiation to check if phase transformation occurred during the tensile deformation process.…”

Section: Mechanical Propertiesmentioning

confidence: 76%

Bio-mimic Ti–Ta composite with hierarchical “Brick-and-Mortar” microstructure

et al. 2019

Materialia

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Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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“…The compositional gradient Ni-Ti shape memory alloys can be achieved through diffusion annealing, [16,20] powder metallurgy, [21][22][23] magnetron sputtering, [24][25][26][27][28] additive manufacturing, etc. [29,30] For instance, a thin layer of Ni (TiN) can be prepared at the surface of the atomic Ni-Ti thin plate using magnetron sputtering or vapor deposition.…”

Section: Compositional Gradient Ni-ti Shape Memory Alloysmentioning

confidence: 99%

Brief Overview of Functionally Graded NiTi‐Based Shape Memory Alloys

et al. 2023

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Shape memory alloys (SMAs) are kinds of smart materials that have superior properties such as shape memory effect and superelasticity, which have the most potential applications in various fields, especially in aerospace, naval, automobile and biomedicine industries, etc. Nevertheless, the inherent natures of shape memory alloys are characterized by the smaller transformation temperature intervals and transformation stress intervals, which make the devices have poor control ability. To achieve the accurate controllability for progressive movement, creating functionally graded shape memory alloys has been adopted. Herein, the classification, fabrications, microstructural features, and performances of functionally graded shape memory alloys are reviewed. For comparison, the creation of various gradients in shape memory alloys can widen the transformation temperature intervals and transformation stress intervals to some extent. In addition, the formation of the compositional, microstructural, or geometrical gradient also contributes to the generation of excellent performances such as the four‐way shape memory effect, higher strength, and larger temperature window for the stress‐assisted two‐way shape memory effect, etc. Such superior functions promote a wider application range of shape memory alloys.

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Compositionally gradient Ti-Ta metal-metal composite with ultra-high strength

Cited by 36 publications

References 31 publications

Synthesis and characterisation of Ti6Al4V/xTa alloy processed by solid state sintering

Synthesis and characterisation of Ti6Al4V/xTa alloy processed by solid state sintering

Bio-mimic Ti–Ta composite with hierarchical “Brick-and-Mortar” microstructure

Brief Overview of Functionally Graded NiTi‐Based Shape Memory Alloys

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