Shape Memory Properties of Biomedical Ti-Mo-Ag and Ti-Mo-Sn Alloys

Mishima, Takashi; Nishida, Minoru

doi:10.2320/matertrans.45.1096

Cited by 145 publications

(69 citation statements)

References 5 publications

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“…In the last decade, some Ti-based solid solutions have attracted much attention as new SMAs because of their excellent properties of low density, high strength, low elastic modulus and good corrosion resistance. These SMAs, including Ti-Nb [3][4][5] and Ti-Mo [6,7] based alloys, generally exhibit a phase transformation between a martensite phase at low temperature and a β-phase (bcc) at high temperature. Three types of martensitic structures, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…α -martensite (hexagonal), α -martensite (orthorhombic) and α -martensite (orthorhombic), have been found showing the complexity of the phase stability of the Ti-Nb and Ti-Mo SMAs [7][8][9]. The transformation strain from β to orthorhombic α is primarily accommodated by internal twinning and the shape memory effect is related with the reverse transformation from α phase to β phase [3,5,6]. The α -martensite, with an orthorhombic structure, is a stress-induced martensite phase different from the commonly mentioned α -martensite [7].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, some studies have shown the effectiveness of alloying elements, e.g. Zr, Nb, V, Al, Pd, Sn and Ag, on modifying the phase transformation characteristics and improving shape memory effect and superelasticity of Ti-Nb and Ti-Mo based alloys [6,7,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Phase stability and hardness of some ternary Ti–Zr based shape memory alloys

Zhifang

Cui

et al. 2011

International Journal of Smart and Nano Materials

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The phase stability and hardness of Ti-30Zr-M (M = Nb, V, Cr, Mo, Fe, Ni and Al) shape memory alloys were investigated by structural observations, d-electron alloy design and microhardness tests. Optical microscopy and X-ray diffraction results show that Nb, V, Cr, Mo and Fe are all β-stability elements in Ti-30Zr-M alloys with the effect enhanced by the presence of Zr. The composition of the least stable β-phase alloy values of Nb, V, Cr, Mo and Fe in Ti-30Zr alloys are 12%, 9%, 5%, 3% and 2%, respectively, indicating an increasing sequence of the β-stability ability. Ni and Al show α-stability or moderate effects and the addition of Ni induces the appearance of (Ti, Zr) 2 Ni phase in Ti-30Zr-5/15Ni alloys. Based on the d-electron alloy design method, the bond order of Ti and alloying atoms (Bo) and the metal d-orbital energy level (Md) are calculated to build the Bo-Md diagram of Ti-30Zr-M alloys associated with the phase structure identification. The microhardness of Ti-30Zr alloy is increased by addition of a small amount of the alloying element, except for Nb. There is a drop of the microhardness of each Ti-30Zr-M alloys when β phase appears by the addition of more alloying elements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase stability and hardness of some ternary Ti–Zr based shape memory alloys

Zhifang

Cui

et al. 2011

International Journal of Smart and Nano Materials

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“…For example the shape memory behavior of -type Ti-base alloys, such as Ti-Mo [3][4][5][6][7], Ti-Nb [8][9][10][11][12] and Ti-Ta [13][14][15][16] alloys, has been reported. The excellent cold-workability of -type Ti-base shape memory alloys have made them attractive for practical applications as new smart materials, since they can be easily fabricated to fine wires and thin plates of dimensions suitable for actual applications.…”

Section: Introductionmentioning

confidence: 99%

Development of high temperature Ti-Ta shape memory alloys

Miyazaki

Kim

Buenconsejo

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. Recent development of Ti-Ta and Ti-Ta-Al high temperature shape memory alloys was reviewed. The effect of Ta content on shape memory behavior of Ti-Ta alloys was first described. Shape memory effect was confirmed in Ti-(30-40)Ta alloys. The Ms formed during aging decreased with increasing Ta so that stable high temperature shape memory effect was confirmed for Ti-32Ta (Ms=440K) during thermal cycling between 173K and 513K. Secondly, the effect of ternary alloying elements (X = V, Cr, Fe, Zr, Hf, Mo, Sn, Al) on the shape memory behavior of Ti-30Ta-X alloys was described. Among the alloying elements, Sn and Al were effective to suppress the effect of aging on the shape For this reason the Ti-30Ta-1Al and Ti-30Ta-1Sn alloys exhibited stable high temperature shape memory effect during thermal cycling. It is suggested that Ti-Ta based alloys are attractive candidates for the development of novel high temperature shape memory alloys.

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“…This has led to the development of Ni-free -Ti base shape memory alloys which consist of only non-toxic elements. [1][2][3][4][5][6][7][8][9][10][11][12] In -Ti alloys, superelasticity is associated with a stress induced martensitic transformation from the phase (bcc) to 00 martensite phase (orthorhombic) by loading and its reverse transformation by unloading. The control of the martensitic transformation temperatures by the adjustment of the amount of -stabilizer elements such as Nb, Mo and Ta is necessary to obtain the superelasticity in Ti-base alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen Addition on Superelasticity of Ti-Zr-Nb Alloys

田原正樹¹,

熙榮²,

稲邑朋也³

et al. 2008

J. Japan Inst. Metals

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Recently, the Ti-Zr-Nb alloys have been developed as Ni-free shape memory and superelastic alloys. In this study, the effects of Nb and nitrogen (N) contents on martensitic transformation behavior, shape memory effect and superelasticity in Ti-18Zr-(12$16)Nb-(0$1:0)N (at%) alloys are investigated using loading and unloading tensile tests, optical microscopy and X-ray diffractometry. The shape memory effect is observed in Ti-18Zr-(12$13)Nb and Ti-18Zr-12Nb-0.5N alloys at room temperature. The superelastic behavior appears by the increase of Nb or N content. The Ti-18Zr-(14$15)Nb, Ti-18Zr-(13$14)Nb-0.5N and Ti-18Zr-(12$14)Nb-1.0N alloys exhibit the superelasticity at room temperature. The martensitic transformation start temperature decreases by 75 K with 1 at% increase of N content for the Ti-18Zr-13Nb alloy. The critical stress for slip deformation and the stress for inducing the martensitic transformation increase with increasing N content. The superelastic recovery strain is also increased by adding N. The maximum recovery strain of 5.0% is obtained in the Ti-18Zr-14Nb-0.5N alloy.

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Shape Memory Properties of Biomedical Ti-Mo-Ag and Ti-Mo-Sn Alloys

Cited by 145 publications

References 5 publications

Phase stability and hardness of some ternary Ti–Zr based shape memory alloys

Phase stability and hardness of some ternary Ti–Zr based shape memory alloys

Development of high temperature Ti-Ta shape memory alloys

Effect of Nitrogen Addition on Superelasticity of Ti-Zr-Nb Alloys

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