The effects of α″ and ω phases on the superelasticity and shape memory effect of binary Ti-Mo alloys

Wang, C.H.; Liu, M.; Hu, Pengfei; Peng, Jing; Wang, J.A.; Ren, Zhongjing; Cao, Guanghui

doi:10.1016/j.jallcom.2017.05.299

Cited by 50 publications

(9 citation statements)

References 43 publications

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“…About 1/3 residual strain (i.e., 0.8%) of shape recovery took place upon heating due to SME (ε sme ). These results agreed well with Ti-6 mol% Mo and Ti-11 mass% Mo (= Ti-5.81 mol% Mo) alloys [23,24]. Additionally, Ti-11 mass% Mo alloy possessing proximate composition to 0Al was reported to undergo plastic deformation mainly by twinning deformation of the β phase [25,26] and was accompanied by SIMT simultaneously in the early stage [27][28][29][30].…”

Section: Resultssupporting

confidence: 81%

Achievement of Room Temperature Superelasticity in Ti-Mo-Al Alloy System via Manipulation of ω Phase Stability

et al. 2022

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The achievement of room-temperature (RT) superelasticity in a Ti-Mo-Al ternary alloy system through the addition of a relatively high concentration of Al to manipulate the phase stability of the ω phase is realized in this study. The composition of the Ti-6 mol% Mo (Ti-11.34 mass% Mo) alloy was designated as the starting alloy, while 5 mol% Al (=2.71 mass% Al) and 10 mol% Al (=5.54 mass% Al) were introduced to promote their superelastic behavior. Among the alloys, Ti-6 mol% Mo-10 mol% Al alloy, which was investigated for the very first time in this work, performed the best in terms of superelasticity. On the other hand, Ti-6 mol% Mo and Ti-6 mol% Mo-5 mol% Al alloys exhibited a shape memory effect upon heating. It is worth mentioning that in the transmission electron microscopy observation, ω phase, which appeared along with β-parent phase, was significantly suppressed as Al concentration was elevated up to 10 mol%. Therefore, the conventional difficulties of the inhibited RT superelasticity were successfully revealed by regulating the number density of the ω phase below a threshold.

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Section: Resultssupporting

confidence: 81%

Achievement of Room Temperature Superelasticity in Ti-Mo-Al Alloy System via Manipulation of ω Phase Stability

et al. 2022

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“…These phenomena can be attributed to the fact that Mo alloying element renders the β phase matrix more stable against the β to ω transformation, resulting in a lower fraction of ω phase particles, further leading to a weaker intensity of precipitate-dislocation interactions. This view can be indirectly supported by the recent investigation of Wang et al [3] which found the formation of ω phase is suppressed with increasing Mo content in water-quenched Ti-Mo alloy specimens by using bright-field transmission electron microscopy observations. Fig.…”

Section: Stress-strain Curves and Mechanical Propertiesmentioning

confidence: 62%

“…Titanium alloys are widely used in many areas from aeronautics to biomedical devices due to their high strength-to-weight ratio, excellent hardenability, good corrosion resistance and enhanced biocompatibility [1][2][3]. In recent years, research on metallic biomaterials has focused on the β titanium alloys produced from nontoxic elements [4][5][6][7][8], particularly using Mo as the alloying element [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal characteristics of Portevin-Le Chatelier effect in Ti-Mo alloys under thermo-mechanical loading

Luo

Castany

Thuillier

et al. 2018

Materials Science and Engineering: A

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The Portevin-Le Chaterlier (PLC) effect in Ti-12Mo and Ti-15Mo alloys has been investigated by using uniaxial tensile tests in a temperature range of 25-350 ℃ with an applied strain rate of the order of 10 -3 s -1 , coupled with a digital image correlation (DIC) method. The experimental results show an increase of the yield stress from 25°C to 250°C followed by a decrease. Moreover, PLC effect occurs above 250°C and stress drop magnitude increases while the number of stress drops per unit time decreases with increasing the strain and temperature as well as decreasing Mo contents. These macroscopic features are related to the reduced intensity of interactions between ω phase particles and mobile dislocations as decreasing temperature and increasing Mo contents. Furthermore, a relatively higher temperature and lower Mo content tend to weaken the spatial cohesion of propagation bands and strengthen strain localization, leading to a change of PLC bands from type A to type B and the increase of strain rate within the PLC bands, which are related to the increased precipitation of ω phases.Additionally, the elongation at fracture is significantly influenced by PLC effect in Ti-Mo alloys.

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“…When it increases, the β phase becomes the only dominant one. Molybdenum stabilizes the β-Ti structure and may suppress the ω-phase transition, which, in many compositions, may exhibit unique properties such as the shape memory effect [41,42]. The presented results demonstrate that different synthesis methods of the β Ti-based alloys may influence the phase composition as well as the final sinters properties.…”

Section: Resultsmentioning

confidence: 80%

Influence of the Processing Method on the Properties of Ti-23 at.% Mo Alloy

Sochacka

Miklaszewski

Kowalski

et al. 2019

Metals

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In this paper, binary β type Ti-23 at.% Mo alloys were obtained by arc melting as well as by mechanical alloying and powder metallurgical process with cold powder compaction and sintering or, interchangeably, hot pressing. The influence of the synthesis method on the microstructure and properties of bulk alloys were studied. The produced materials were characterized by an X-ray diffraction technique, scanning electron microscopy and chemical composition determination. Young’s modulus was evaluated with nanoindentation testing method based on the Oliver and Pharr approach. The mechanically alloyed Ti-23 at.% Mo powders, after inductively hot-pressed at 800 °C for 5 min, allowed the formation of single Ti(β) phase alloy. In this case, Young’s modulus and Vickers hardness were 127 GPa and 454 HV0.3, respectively. Among the examined materials, the porous (55%) single-phase scaffold showed the lowest indentation modulus (69.5 GPa). Analytical approach performed in this work focuses also on the surface properties. The estimation includes the corrosion resistance analyzed in the potentiodynamic test, and also some wettability properties as a contact angle, and surface free energy values measured in glycerol and diiodomethane testing fluids. Additionally, surface modification of processed material by micro-arc oxidation and electrophoretic deposition on the chosen samples was investigated. Proposed procedures led to the formation of apatite and fluorapatite layers, which influence both the corrosion resistance and surface wetting properties in comparison to unmodified samples. The realized research shows that a single-phase ultrafine-grained Ti-23 at.% Mo alloy for medical implant applications can be synthesized at a temperature lower than the transition point by the application of hot pressing of mechanically alloyed powders. The material processing, that includes starting powder preparation, bulk alloy transformation, and additional surface treatment functionalization, affect final properties by the obtained phase composition and internal structure.

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The effects of α″ and ω phases on the superelasticity and shape memory effect of binary Ti-Mo alloys

Cited by 50 publications

References 43 publications

Achievement of Room Temperature Superelasticity in Ti-Mo-Al Alloy System via Manipulation of ω Phase Stability

Achievement of Room Temperature Superelasticity in Ti-Mo-Al Alloy System via Manipulation of ω Phase Stability

Spatiotemporal characteristics of Portevin-Le Chatelier effect in Ti-Mo alloys under thermo-mechanical loading

Influence of the Processing Method on the Properties of Ti-23 at.% Mo Alloy

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