Ti(Pt, Pd, Au) based High Temperature Shape Memory Alloys

Yamabe‐Mitarai, Yoko; Arockiakumar, R.; Wadood, A.; Suresh, K.S.; Kitashima, Tomonori; Hara, Toru; Shimojo, Makoto; Tasaki, Wataru; Takahashi, Madoka; Takahashi, Satoshi; Hosoda, Hideki

doi:10.1016/j.matpr.2015.07.338

Cited by 37 publications

(16 citation statements)

References 22 publications

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“…Therefore, this study investigates the effect of further Zr addition on shape recovery. A previous study also indicated that V addition drastically improved the strength of both the martensite and austenite phases 26) . Hence, the effect of V addition on the shape recovery of Ti-Pd-Zr was also investigated.…”

Section: Introductionmentioning

confidence: 76%

“…In our previous study, we focused on the addition of different alloying elements into TiPd to improve its strength, of which Zr was found to be the most promising alloying element [26][27][28] . For example, the addition of 5 at% Zr to TiPd improved the shape recovery ratio from 13% in the TiPd binary alloy to 94% after being tested at 380 C 28) .…”

Section: Introductionmentioning

confidence: 99%

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Training Effect on Microstructure and Shape Recovery in Ti-Pd-Zr Alloys

et al. 2017

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The training effect of microstructure and shape recovery on Ti-50Pd-xZr (x = 7 and 10) at% and Ti-50Pd-xZr-(5-x)V (x = 1, 2.5, and 4) high-temperature shape memory alloys were investigated. Zr was selected as an alloying element as it is known to improve the shape recovery of TiPd. As a further alloying element, V was selected because it is effective in strengthening TiPd. The dependence of Zr content and V addition on the martensitic transformation (MT) temperature, shape recovery, and training effect were investigated. For example, M f , decreased with increasing Zr from 480 C in Ti-50Pd to 302 C in Ti-50Pd-10Zr. In Ti-50Pd-xZr-(5-x)V, when the total amount of Zr and V was 5 at%, the MT temperatures did not change drastically. The MT temperatures ranged between 350 and 550 C. Shape recovery was investigated using the thermal cyclic test under a constant applied stress in the range of 15 to 200 MPa. Perfect recovery was obtained at low stresses, while irrecoverable strain was observed at high stresses. For Ti-50Pd-2.5Zr-2.5V and Ti-50Pd-1Zr-4V, creep deformation was observed above 150 MPa. To obtain perfect recovery, training (repeated thermal cyclic tests under a constant applied stress) was performed. Perfect recovery was obtained for the alloys by training, except for Ti-50Pd-4Zr-1V. Ti-50Pd-10Zr achieved perfect recovery up to 200 MPa, while Ti-50Pd-1Zr-4V achieved perfect recovery up to 150 MPa. Other alloys achieved perfect recovery at lower stresses of 65 or 50 MPa. The microstructure changed from a random martensite variant to a speci c orientation during training, to accommodate the large strain during deformation. It was found that a strong texture led to perfect shape recovery.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Training Effect on Microstructure and Shape Recovery in Ti-Pd-Zr Alloys

et al. 2017

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“…The current author has published a number of papers related to nickel-free titanium based shape memory alloys for biomedical and engineering applications in international journals [78][79][80][81][82][83][84][85][86]. During postdoctoral work from 2012 to 2014 in the High Temperature Materials Unit, National Institute for Materials Science (NIMS), Tsukuba, Japan, the current author's research activities were related to TiPt and TiAu based intermetallics for high temperature applications and he has published papers in international journals [87][88][89][90][91][92][93][94].…”

Section: Biocompatibility Issues Of Nitinolmentioning

confidence: 99%

Brief Overview on Nitinol as Biomaterial

Wadood

2016

Advances in Materials Science and Engineering

105

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Shape memory alloys remember their shape due to thermoelastic martensitic phase transformation. These alloys have advantages in terms of large recoverable strain and these alloys can exert continuous force during use. Equiatomic NiTi, also known as nitinol, has a great potential for use as a biomaterial as compared to other conventional materials due to its shape memory and superelastic properties. In this paper, an overview of recent research and development related to NiTi based shape memory alloys is presented. Applications and uses of NiTi based shape memory alloys as biomaterials are discussed. Biocompatibility issues of nitinol and researchers’ approach to overcome this problem are also briefly discussed.

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“…It has been also reported that the equiatomic TiPd alloy has a shape recovery ratio of about 60%, using the following equation: shape recovery ratio = (L" − L')/ (L' − L 0 ) × 100, where is L 0 : initial length of sample, L': deformed sample length, and L": recovered sample length. Moreover, the shape recovery ratio improves with the addition of a third element [4,5]. In addition, Sato et al reported that a complete shape recovery was achieved by the effect of a training process, that is, a repeated isobaric test on the Ti-Pd-Zr alloy [6].…”

Section: Introductionmentioning

confidence: 99%

Shape Change and Crystal Orientation of B19 Martensite in Equiatomic TiPd Alloy by Isobaric Test

Hisada

Matsuda

Yamabe‐Mitarai

2020

Metals

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We investigated the texture and the shape change in the equiatomic TiPd alloy, and discussed the relationship between the shape change and the atomic movements associated with martensitic transformation. Thermomechanical analyzer tests indicate that the direction of the shape change was different between the 0° and 90° samples, cutting out parallel and perpendicular to the hearth side of button ingot, respectively. In the 0° sample, shrinking and expansion were observed during the reverse and forward martensitic transformations, respectively, whereas the opposite tendency was confirmed in the 90° sample compared to the 0° sample. During the isobaric test, the martensitic variants were oriented to a (010) plane with compressive loading, and the B2 parent phase crystals also became coarse. There is a close relationship between the shape change due to the crystal orientation by the isobaric test and the shear-shuffling direction due to martensitic transformation.

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Ti(Pt, Pd, Au) based High Temperature Shape Memory Alloys

Cited by 37 publications

References 22 publications

Training Effect on Microstructure and Shape Recovery in Ti-Pd-Zr Alloys

Training Effect on Microstructure and Shape Recovery in Ti-Pd-Zr Alloys

Brief Overview on Nitinol as Biomaterial

Shape Change and Crystal Orientation of B19 Martensite in Equiatomic TiPd Alloy by Isobaric Test

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