Martensitic transformation, shape memory effect and superelasticity of Ti–Nb binary alloys

Kim, H.Y.; Ikehara, Yukio; Kim, J.I.; Hosoda, Hideki; Miyazaki, S.

doi:10.1016/j.actamat.2006.01.019

Cited by 885 publications

(573 citation statements)

References 25 publications

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“…%. It was demonstrated that the least composition for Nb keeping β-phase stable at room temperature in Ti-Nb alloy is 25.5% [5]. Therefore, Zr actually takes effect as a β-stability element rather than a neutral one in Ti-30Zr-xNb alloy because of the reduced β c value of Nb.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Oxygen-doped Ti-Nb-O shape memory alloy 26,27 was selected as a disordered martensitic system, whereas well studied disordered system is a nonstoichiometric Ti 48.5 -Ni 51.5 strain glass 9-14 because of the following reasons. The main difference between Ti-Nb-O and Ti-Ni systems is the type of disorder; interstitial atoms in Ti-Nb-O while substitutional atoms in Ti-Ni.…”

Section: Methodsmentioning

confidence: 99%

“…36 Note that this elongation strain is considerably larger than the Bain strain ͑lat-tice distortion along the principle axes͒, which is at most 4% in the case of Ti-Nb shape memory alloy. 26 The shuffling can hence play a central role in relaxing the elastic strain energy. So, if the system is near T c ‫ء‬ and has an elastically 'soft' host lattice against shear along ͗110͘ on ͕110͖, the insertion of elastic dipoles will result in the spontaneous formation of local martensitelike domains.…”

Section: A Interstitial Oxygen Atoms As a Source Of Effective Randommentioning

confidence: 99%

Effect of randomness on ferroelastic transitions: Disorder-induced hysteresis loop rounding in Ti-Nb-O martensitic alloy

et al. 2010

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We have studied the effect of disorder on the martensitic transformation ͑MT͒, especially on the hysteretic behavior of Ti-Nb-O alloy. This system allows arbitrary tuning of the amount of disorder by the introduction of interstitial oxygen atoms into elastically soft host lattice ͓Ti-26Nb ͑at. %͒ alloy͔, which results in the formation of randomly oriented nanometer-sized martensite as confirmed by dark-field transmission electron microscopy images. In the clean system without interstitial oxygen doping, we observe a sharp hysteresis loop with plateau region in both a stress-strain curve and a strain-temperature curve, whereas a slim hysteresis loop without plateau appears by introducing disorder. The rounding of hysteretic behavior can be understood in random-field Ising model regime, providing the possibility of a new physical picture for MT in a dirty system, where the small size of martensite homogeneously nucleates and percolates the whole system.

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