Structural relaxation and crystallization of NiTi thin film metallic glasses

Huang, Xu; Ramirez, A. P.

doi:10.1063/1.3236544

Cited by 35 publications

(11 citation statements)

References 29 publications

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“…The absolute values of hardness and Young's moduli, e.g. Ti 50 Ni 40 Cu 10 ∼3.7 GPa and 115 GPa, respectively, correspond well to values published for other Ti-Ni thin films determined using nanoindentation [53][54][55][56][57]. However, the Young's moduli for the martensite are considerably larger than those determined for bulk alloys, for which additionally, the Young's modulus of austenite is found to be larger than that of martensite, i.e.…”

Section: Resultssupporting

confidence: 86%

High-throughput characterization of mechanical properties of Ti–Ni–Cu shape memory thin films at elevated temperature

Zarnetta

Kneip

Somsen

et al. 2011

Materials Science and Engineering: A

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Section: Resultssupporting

confidence: 86%

High-throughput characterization of mechanical properties of Ti–Ni–Cu shape memory thin films at elevated temperature

Zarnetta

Kneip

Somsen

et al. 2011

Materials Science and Engineering: A

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“…This may be due to the stress relaxation of the films after the heating process. 50 Surface analysis using X-ray photoelectron spectroscopy Surface structure and chemical composition of the implanted materials have crucial roles in their function and performance in biological conditions. Therefore, surface chemistry of fabricated metallic glass thin films was investigated.…”

Section: Patterning Of Ticuni Thin Films By the Thermal Imprinting Tementioning

confidence: 99%

Metallic glass thin films for potential biomedical applications

et al. 2014

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We introduce metallic glass thin films (TiCuNi) as biocompatible materials for biomedical applications. TiCuNi metallic glass thin films were deposited on the Si substrate and their structural, surface, and mechanical properties were investigated. The fabricated films showed good biocompatibility upon exposure to muscle cells. Also, they exhibited an average roughness of <0.2 nm, high wear resistance, and high mechanical properties (hardness ∼6.9 GPa and reduced modulus ∼130 GPa). Top surface of the TiCuNi films was shown to be free from Ni and mainly composed of a thin titanium oxide layer, which resulted in the high surface biocompatibility. In particular, there was no cytotoxicity effect of metallic glass films on the C2C12 myoblasts and the cells were able to proliferate well on these substrates. Low cost, viscoelastic behavior, patternability, high electrical conductivity, and the capability to coat various materials (e.g., nonbiocompatible materials) make TiCuNi as an attractive material for biomedical applications.

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“…This is largely due to the technical difficulty in characterizing the structural features of an amorphous matrix. It has been reported that heating at low temperatures (e.g., 400 C) increases the Young's modulus and hardness of NiTi amorphous thin films, and both effects are attributed to the reduction of free volume in the matrix associated with relaxation caused by heating [17]. It has also been reported that the crystallization nucleation rate is increased after a pre-relaxation treatment, leading to a more homogeneous grain size distribution.…”

Section: Introductionmentioning

confidence: 99%

“…This observation is attributed to the formation of short-range ordered clusters during structural relaxation, which favor nucleation. However, it is not clear how the short-range ordered clusters are formed by atomic rearrangement [17]. Peterlechner et al [13] studied the relaxation of cold rolled NiTi containing amorphous and highly deformed crystalline domains by means of modulated DSC measurements.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron high energy X-ray diffraction study of microstructure evolution of severely cold drawn NiTi wire during annealing

Aoun

Cui

et al. 2016

Acta Materialia

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a b s t r a c tMicrostructure evolution of a cold-drawn NiTi shape memory alloy wire was investigated by means of insitu synchrotron high-energy X-ray diffraction during continuous heating. The cold-drawn wire contained amorphous regions and nano-crystalline domains in its microstructure. Pair distribution function analysis revealed that the amorphous regions underwent structural relaxation via atomic rearrangement when heated above 100 C. The nano-crystalline domains were found to exhibit a strong cold work induced lattice strain anisotropy along 〈111〉, which coincides with the crystallographic fiber orientation of the domains along the wire axial direction. The lattice strain anisotropy systematically decreased upon heating above 200 C, implying a structural recovery. Crystallization of the amorphous phase led to a broadening of the angular distribution of 〈111〉 preferential orientations of grains along the axial direction as relative to the original 〈111〉 axial fiber texture of the nanocrystalline domains produced by the severe cold wire drawing deformation.

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Structural relaxation and crystallization of NiTi thin film metallic glasses

Abstract: Glass transition behavior, crystallization kinetics, and microstructure change of Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 bulk metallic glass under high pressure Effects of relaxation on glass transition and crystallization of ZrTiCuNiBe bulk metallic glass

Cited by 35 publications

References 29 publications

High-throughput characterization of mechanical properties of Ti–Ni–Cu shape memory thin films at elevated temperature

High-throughput characterization of mechanical properties of Ti–Ni–Cu shape memory thin films at elevated temperature

Metallic glass thin films for potential biomedical applications

Synchrotron high energy X-ray diffraction study of microstructure evolution of severely cold drawn NiTi wire during annealing

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