Characterization of a rapidly annealed Ti50Ni25Cu25 melt-spun ribbon

Tong, Y.X.; Liu, Yong; Xie, Zhenghua

doi:10.1016/j.jallcom.2007.02.075

Cited by 19 publications

(7 citation statements)

References 24 publications

(42 reference statements)

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“…Other researchers have observed this modification in the crystallization temperature in Te-based thin film metallic glasses. 22 Interestingly, this shift in crystallization temperature does not occur in bulk metallic glasses ͑BMGs͒ 17 nor in ribbons, 23 where the crystallization temperature remains constant irrespective of structural relaxation. This difference may be related to the high stress conditions in thin films.…”

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confidence: 99%

Structural relaxation and crystallization of NiTi thin film metallic glasses

Huang

Ramirez

2009

Applied Physics Letters

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confidence: 99%

Structural relaxation and crystallization of NiTi thin film metallic glasses

Huang

Ramirez

2009

Applied Physics Letters

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“…The sample shows the small hysteresis of approximately 3 o C (i.e. the difference between the peak temperatures on cooling and heating), which is in a good agreement with reported values for Ti-Ni-Cu system [11,12,27,44,162]. The quantification of shape recovery of the free-standing films in this study using the available micro-tensile tester was challenging, because of the difficulties in clamping of the films with the grips.…”

Section: Temperatures and Functional Propertiessupporting

confidence: 87%

“…Tong et al investigated the crystallization of Ti-Ni-Cu ribbons modified by RTA, where the samples were annealed by irradiation of the photons from a halogen lamp and showed ability of RTA to crystallize the ribbons in a shorter dwell times allowing more precise control of microstructure and functionality [26,27]. Many aspects of rapid thermal annealing of SMA thin films remain to be studied, and part of this research is concerned with describing and correlating the evolution of structural, surfacial and nano-scale mechanical properties of amorphous Ti-Ni-Cu thin films annealed in this manner.…”

Section: Chaptermentioning

confidence: 99%

“…Tong et al investigated the crystallization of Ti-Ni-Cu ribbons modified by rapid thermal annealing (RTA) with photon irradiation from a halogen lamp ( Fig. 2-9b) using shorter dwell times that allows more precise control of microstructure and functionality [26,27]. Another technique is electrical thermal annealing (ETA) that generates ultra-fast heating by applying an electrical pulse current to a resistive heating element (e.g., Si, W and Pt) ( Fig.…”

Section: Annealing Techniques For Crystallizationmentioning

confidence: 99%

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Characterization of nickel-titanium based thin films crystallized by fast and ultra-fast annealing methods

Sharabiani¹

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Titanium-nickel based thin films can be used as actuators in micro-electro-mechanical systems (MEMS) in such applications as valves, pumps, grippers and sensors. These films are typically prepared using magnetron sputtering. The resultant films are amorphous if deposited at room temperature and annealing is necessary as actuation occurs in the crystalline state by a martensitic phase transformation. Consequently, understanding the nature of the annealing process is critical for microstructural control and optimization of MEMS actuators. The first part of the study is concerned with describing and correlating the evolution of structural, surfacial and nano-scale mechanical properties of amorphous Ti-Ni-Cu thin films crystallized by rapid thermal annealing (RTA), where the treatment takes place under a protected atmosphere by electromagnetic irradiation with fast heating rate (< 100 o C/sec). Long range order of amorphous Ti-Ni-Cu thin films was achieved in a few seconds (> 60 sec), with the optimum crystallization temperature of 480 o C. The fast crystallization process allows the precise control of microstructure in a lower thermal budget (product of processing temperature and time). With increasing the annealing time (up to 180 sec), roughness increased dramatically, and was far more prominent than in films prepared by conventional thermal annealing (CTA). Although RTA is energy efficient due to the shorter annealing time, the film roughness is less ideal than CTA, which may prove limiting in specific applications. Using X-ray absorption spectroscopy (XAS), it was found that the RTA (180 sec) and CTA (1 hr) films possessed the longest range order. The evolution of the nano-scale mechanical properties of the RTA films during annealing was also studied,

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“…To study the kinetics of -Mg 17 Al 12 phase dissolution and eutectic transformation, the activation energy E can be obtained by means of Kissinger's equation (Tong and Liu 2008):…”

Section: Microstructure In-homogeneitiesmentioning

confidence: 99%

Laser surface processing of ultralight magnesium alloys

Guan

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for making the effort to participate in my qualifying examination. Second, I would like to express my appreciation to Machining Technology Group from Singapore Institute of Manufacturing Technology for providing me privileges to use their facilities and for providing great help through my study. I would like to thank Dr. Zheng Hongyu for his brilliant guidance and caring financial support. He opened up a whole new world of laser science to me. I am also grateful to Dr. Li Zhongli for her countless contribution to this work. Her great knowledge on lasers and ingenious experimental techniques has helped me numerous difficulties and guided me to become a skilled researcher. Third, I would like to thank the other great members of our research group for their nice friendship on my research work and life during the past four years.

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Characterization of a rapidly annealed Ti50Ni25Cu25 melt-spun ribbon

Cited by 19 publications

References 24 publications

Structural relaxation and crystallization of NiTi thin film metallic glasses

Structural relaxation and crystallization of NiTi thin film metallic glasses

Characterization of nickel-titanium based thin films crystallized by fast and ultra-fast annealing methods

Laser surface processing of ultralight magnesium alloys

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