Effect of Sn and Zr addition on the martensitic transformation behavior of Ti-Mo shape memory alloys

Endoh, Kazuki; Tahara, Masaki; Inamura, Tomonari; Hosoda, Hideki

doi:10.1016/j.jallcom.2016.10.108

Cited by 35 publications

(16 citation statements)

References 24 publications

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“…The research on the material design (e.g. optimisation of alloying elements 7 – 16 and thermo-mechanical treatments 17 – 19 ) and fundamental aspects of martensitic transformation 20 – 29 in Ti base alloys has rapidly grown. One of the biggest problem of Ti base SMAs from a practical viewpoint is a low critical stress for plastic deformation, which causes a small shape recovery strain 9 and unstable superelasticity during the cyclic deformation 30 – 32 .…”

Section: Introductionmentioning

confidence: 99%

Plastic deformation behaviour of single-crystalline martensite of Ti-Nb shape memory alloy

Tahara

Okano

Inamura

et al. 2017

Sci Rep

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β-Ti alloys have attracted considerable attention as new biomedical shape memory alloys. Given the critical importance of the plastic deformation in the martensite phase for the shape memory effect and superelasticity, we investigated here the plastic deformation behaviour of a single crystal of α″ (orthorhombic) martensite of Ti-27 mol%Nb shape memory alloy obtained by the stress-induced martensitic transformation of a single crystal of the parent β phase. Four operative plastic deformation modes were observed, including two dislocation slips and two twinnings. To the best of our knowledge, two of these plastic deformation modes (one dislocation slip and one twinning) were discovered for the first time in this study. The identified slip and twinning systems in the martensite phase have corresponding slip and twinning systems in the parent β phase with which they share many similarities. Therefore, we believe that the plastic deformation of the α″ martensite is inherited from that of the parent β phase.

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Section: Introductionmentioning

confidence: 99%

Plastic deformation behaviour of single-crystalline martensite of Ti-Nb shape memory alloy

Tahara

Okano

Inamura

et al. 2017

Sci Rep

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“…Titanium alloys are extensively used in many applications from biomedical devices to aeronautics, owing to their good strength-to-weight ratio, high corrosion resistance, enhanced hardenability and excellent biocompatibility [1][2][3][4]. Focusing on metallic biomaterials, much effort has been devoted to investigating the β titanium alloys made of nontoxic elements [5][6][7][8], especially employing Mo alloying element [9][10][11]. This is mainly attributed to the fact that molybdenum, as an effective β stabilizer, is less toxic than other alloying elements, and it can be used to develop titanium alloys with a high strength and low elastic modulus suitable for implant applications [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

Luo

Castany

Thuillier

2019

Materials Science and Engineering: A

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The microstructure, mechanical properties and Portevin-Le Chatelier (PLC) effect in Ti-xMo alloys (x=10, 12, 15 and 18 wt%), in the temperature range of 250-350 °C with strain rates from 10-3 s-1 to 10-4 s-1 , are systematically investigated in tension by using transmission electron microscopy and Gleeble 3500 testing machine combined with a digital image correlation technique. Results show that Young modulus decreases with increasing Mo contents, which is related to a more stable β phase matrix and a decrease of ω phase fraction. Moreover, the values of Young modulus and 0.2% offset yield strength at elevated temperature are higher than the ones at room temperature in all the Ti-xMo alloys, except the Ti-18Mo alloy which shows an opposite result. These macroscopic features are consistent with the ω phase precipitation in deformed Ti-xMo alloys, due to the combined effects of ω phase strengthening and temperature softening. Furthermore, the serration type transforms from A to A+B, then to B and eventually to C as increasing temperature and decreasing strain rate as well as Mo contents, which mainly depends on the spatial cohesion of PLC bands influenced by the intensity of ω precipitate-dislocation interactions. Finally, the peak value of maximum stress drop magnitude appears in Ti-12Mo alloy and increases with decreasing the strain rate, which is attributed to a stronger intensity of ω precipitate-dislocation interactions caused by reducing dislocations movement and

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“…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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Effect of Sn and Zr addition on the martensitic transformation behavior of Ti-Mo shape memory alloys

Cited by 35 publications

References 24 publications

Plastic deformation behaviour of single-crystalline martensite of Ti-Nb shape memory alloy

Plastic deformation behaviour of single-crystalline martensite of Ti-Nb shape memory alloy

Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

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

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