Crystal structure of the martensite in Ti-49.2 at.%Ni alloy analyzed by the single crystal X-ray diffraction method

Kudoh, Yasuhiro; Tokonami, Masayasu; Miyazaki, S.; Otsuka, Kazuhiro

doi:10.1016/0001-6160(85)90128-2

Cited by 392 publications

(175 citation statements)

References 15 publications

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“…The structural parameters for NiTi in the B11, L1 0 , B19, and B19Ј structures are determined by calculation and in Table II, we compare experimental results for the B19Ј structure with our calculated B19Ј and B19 structure. Our results for the B19Ј structure are closest to the experimental results of Kudoh et al 12 Calculation of a B19Ј structure using the coordinates of MS ͑Ref. 11͒ yielded a higher energy structure with significant forces on the atoms in the unit cell.…”

Section: Nitisupporting

confidence: 86%

Structural and electronic properties of the martensitic alloys TiNi, TiPd, and TiPt

Chan

1997

Phys. Rev. B

114

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The electronic and structural properties for TiNi, TiPd, and TiPt are studied using first-principles total energy calculations. For each alloy, the structural parameters for a few structural phases are found from energy and force calculations. In each case, we found that the ground state martensitic phase (B19/B19Ј) is indeed lower in energy than the high temperature B2 phase. In all three alloys, the lowering in energy of the B19/B19Ј structure is associated with the electronic properties such as lowering of the density of states at the Fermi level at the Ti site, and the broadening of the transition-metal d bands in the B19/B19Ј phase compared with the B2 phase. ͓S0163-1829͑97͒00331-7͔

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Section: Nitisupporting

confidence: 86%

Structural and electronic properties of the martensitic alloys TiNi, TiPd, and TiPt

Chan

1997

Phys. Rev. B

114

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“…The (001) compound twin is considered to be a deformation twin in the TiNi martensite [5]. As is well known, the slip system [100](001) was suggested to be the most possible in the martensite in TiNi alloy [16]. According to Kudoh et al [16], a (001) twin is created by slip of a/2 on the (001) plane because of the presence of a partial pseudo-mirror, therefore the (001) compound twin is easily formed.…”

Section: Discussionmentioning

confidence: 99%

“…As is well known, the slip system [100](001) was suggested to be the most possible in the martensite in TiNi alloy [16]. According to Kudoh et al [16], a (001) twin is created by slip of a/2 on the (001) plane because of the presence of a partial pseudo-mirror, therefore the (001) compound twin is easily formed. In a previous study on an aged Ti -51at.%Ni alloy, the (001) compound twin was found to be the dominant defect in the martensite, where the internal stress fields at the coherent boundary between the fine precipitates and parent phase, and the constraint for the atomic arrangement of the parent phase because of the coherent precipitates are considered to act mutually to introduce its formation [17].…”

Section: Discussionmentioning

confidence: 99%

“…The (111) Type I twinning plate is found in the present severely cold-drawn specimen. It was first reported in the tensioned TiNi alloy by the single-crystal X-ray diffraction method [16], and as yet has not been confirmed to exist in the thermal martensite in TiNi alloy by the TEM alloy [15], respectively. This twinning mode is clearly introduced by cold-drawn deformation; therefore, it should be regarded as deformation twinning.…”

Section: Discussionmentioning

confidence: 99%

“…The ingot was hot swaged and rolled at 850°C to rods with approximately 8 mm diameter. After annealing at 850°C for 1 h, some specimens were colddrawn at room temperature to the extents of 5,8,12,14,16,22 and 30% reduction in area, respectively. The tensile tests were carried out on an Instron-1186 testing machine with a strain rate of 4.1 × 10 − 4 s − 1 .…”

Section: Methodsmentioning

confidence: 99%

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The microstructure and linear superelasticity of cold-drawn TiNi alloy

Zheng

Huang

Zhang

et al. 2000

Materials Science and Engineering: A

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The microstructure and linear superelasticity of cold-drawn TiNi alloy have been investigated using CTEM, HREM and in-situ transition electron microscopy observations and tensile tests. The microstructural evolution procedure of the martensite variants with increasing degree of area reduction was found to be that the quantities of (111( ) Type I, (001) compound, (011) Type I and (111) Type I twinning plates increase gradually with decreasing the amount of the 011 Type II twinning bands. The corresponding dominant deformation mechanism changed from the coalescence of martensite variants to the reorientation of substructural bands inside martensite variants utilizing the most favorably oriented twin systems. The intrinsic reason for the linear superelasticity of the moderately cold-drawn TiNi alloy was confirmed to be associated with the appearance and disappearance of (001) microtwinning inside the 011 Type II substructural bands.

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Shape Memory Materials for Biomedical Applications

et al. 2002

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Shape memory properties provide a very attractive insight into materials science, opening unexplored horizons and giving access to unconventional functions in every material class (metals, polymers, and ceramics). In this regard, the biomedical field, forever in search of materials that display unconventional properties able to satisfy the severe specifications required by their implantation, is now showing great interest in shape memory materials, whose mechanical properties make them extremely attractive for many biomedical applications. However, their biocompatibility, particularly for long‐term and permanent applications, has not yet been fully established and is therefore the object of controversy. On the other hand, shape memory polymers (SMPs) show promise, although thus far, their biomedical applications have been limited to the exploration. This paper will first review the most common biomedical applications of shape memory alloys and SMPs and address their critical biocompatibility concerns. Finally, some engineering implications of their use as biomaterials will be examined.

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Crystal structure of the martensite in Ti-49.2 at.%Ni alloy analyzed by the single crystal X-ray diffraction method

Cited by 392 publications

References 15 publications

Structural and electronic properties of the martensitic alloys TiNi, TiPd, and TiPt

Structural and electronic properties of the martensitic alloys TiNi, TiPd, and TiPt

The microstructure and linear superelasticity of cold-drawn TiNi alloy

Shape Memory Materials for Biomedical Applications

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