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Electron beam deposition and characterization of thin film Ti-Ni for shape memory applications

稀有金属：英文版 2006年第Z2期25卷 237-242页

作者： NOH Hae-Yong JEE Kwang-Koo LEE Kyu-Hwan LEE Young-Kook Department of Metallurgical System Yonsei University Seoul 120-749 KoreaAdvanced Materials Research Center Division of Materials Korea Institute of Science and Technology Cheongryang Seoul 130-650 Korea Advanced Materials Research Center Division of Materials Korea Institute of Science and Technology Cheongryang Seoul 130-650 Korea Department of Metallurgical System Yonsei University Seoul 120-749 Korea

Thin film of Ti-Ni alloy has a potential to perform the microactuation functions required in the microelectromechanical system (MEMS). It is essential, however, to have good uniformity in both chemical composition and thickness to realize its full potential as an active component of MEMS devices. Electron beam evaporation technique was employed in this study to fabricate the thin films of Ti-Ni alloy on different substrates. The targets used for the evaporation were first prepared by electron beam melting. The uniformity of composition and microstructure of the thin films were characterized by electron probe microanalysis (EPMA), Auger electron spectroscopy (AES), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM). The mechanical property of the thin films was evaluated by the nano-indentation test. The martensitic transformation temperature was measured by differential scanning calorimetry (DSC). It is confirmed that the chemical composition of deposited thin films is identical to that of the target materials. Furthermore, results from depth profiling of the chemical composition variation reveal that the electron beam evaporation process yields better compositional homogeneity than other conventional methods such as sputtering and thermal evaporation. Microstructural observation by TEM shows that nanometer size precipitates are preferentially distributed along the grain boundaries of a few micron size grains. The hardness and elastic modulus of thin films decreases with an increase in Ti contents.

关键词： electron beam evaporation tini SMA thin film martensitic transformation reverse martensitic transformation

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Variations in Wear Resistance of a Novel Triboalloy Pseudoelastic tini Alloy-with Respect to its Pseudoelasticity and Hardness

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Journal of Materials Science & Technology 2001年第1期17卷 45-46页

作者： D.Y.Li and X.Ma Dept. of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6 Dep. of Chem. Univ. of Alberta Edmonton Canada

It has recently been found that TiNt shape memory alloy has another attractive property; high resistance to wear. The wear resistance of this alloy benefits from its pseudoelasticity (PE). It has, however, been noticed that other mechanical properties also affect the wear resistance, especially the hardness. Research was conducted to investigate the correlation between the wear resistance and both the PE and hardness. It has been demonstrated that when the PE is high, lower hardness leads to higher wear resistance.

关键词： tini Variations in Wear Resistance of a Novel Triboalloy Pseudoelastic tini Alloy-with Respect to its Pseudoelasticity and Hardness

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Surface properties of nitrogen-ion-implanted tini shape memory alloy

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Journal of University of Science and Technology Beijing 2006年第2期13卷 154-157页

作者： Chongyan Leng Teruo Asaoka Rong Zhou School of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093 China Department of Intelligent and Mechanical Engineering Tokyo Denki University Hatoyama Hiki-Gun Saitama 350-0394 Japan School of Mechanical Engineering Kunming University of Science and Technology Kunming 650093 China

X-ray diffraction （XRD）, auger electron spectroscopy （AES）, and X-ray photoelectron spectroscopy （XPS） were used to characterize the surface properties of the N^ ＋-ion-implanted tini alloy. There is a high nitrogen content region at the outermost surface of the N^＋-ion-implanted tini alloy. The detected nitrogen exists mainly in the form of TiN. Small amounts of Ti305 and TiO2 also exist on the surface of the N^＋-ion-implanted tini sample. The modified layer of the N^＋-ion-implanted sample can work as an obstacle layer of the nickel＇s dissolution, which obstructs Ni dissolving from the tini surface effectively.

关键词： shape memory alloys tini surface properties

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Abrasive wear property of laser melting/deposited Ti_2Ni/tini intermetallic alloy

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中国有色金属学会会刊：英文版 2007年第6期17卷 1358-1362页

作者：高飞王华明 Laboratory of Laser Materials Processing and Manufacturing School of Materials Science and EngineeringBeihang University

A wear resistant intermetallic alloy consisting of tini primary dendrites and Ti2Ni matrix was fabricated by the laser melting deposition manufacturing process. Wear resistance of Ti2Ni/tini alloy was evaluated on an abrasive wear tester at room temperature under the different loads. The results show that the intermetallic alloy suffers more abrasive wear attack under low wear test load of 7, 13 and 25 N than high-chromium cast-iron. However, the intermetallic alloy exhibits better wear resistance under wear test load of 49 N. Abrasive wear of the laser melting deposition Ti2Ni/tini alloy is governed by micro-cutting and plowing. Pseudoelasticity of tini plays an active role in contributing to abrasive wear resistance.

关键词： tini Ti2Ni 磨损金属合金

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The Two-step Reverse Martensitic Transformations of tini Shape Memory Alloy Based on Solution-treatment and Aging

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Chinese Journal of Aeronautics 2006年第B12期19卷 198-201页

作者： JIANG Da-qiang CUI Li-shan ZHENG Yan-jun JIANG Xiao-hua Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China

A tini-alloy is solution-treated in a vacuum furnace of 6.7×10^-3 Pa at 1 223 K for 3.6 ks, and then aged at 773 K for 1.8 ks. The differential scanning calorimetry （DSC） measurements show that after the heat-treatment, takes place a two-step reverse Martensitic transformation, from which results the two-stage recovery strain in a prestrained Martensitic tini-alloy wire during heating. The Vickers microhardness indentation test in cross-sectional areas of the tini-alloy wire indicates the compositional heterogeneity between its surface layers and its inside. The fact that the sizes of the indentation in surface layers smaller than those in the inside bears witness to the existence of slightly harder surface layers. It is believed that these phenomena are related to the compositional fluctuation caused by the evaporation and oxidization of Ti-element during the solution-treatment and heterogeneity formed during the subsequent aging treatment.

关键词： shape memory alloy （SMA） tini solution-treatment heterogeneity

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Effects of thermomechanical cycling on the shape memory behavior and transformation temperatures of a Ni50.2Ti49.8 alloy

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Rare Metals 2008年第5期27卷 522-525页

作者： LI Yanfeng MI Xujun GAO Baodong TAN Ji State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Beijing 100088 China

The effects of thermomechanical cycling on the shape memory behavior and transformation temperatures of a Ni50.2Ti49.8 alloy under a constant applied stress of 300 MPa were investigated, k is believed that thermomechanical cycling induces defects such as dislocations, which evidently affect the shape memory behavior and transformation temperatures. The recovery strain decreases with increasing number of thermomechanical cycles, whereas the irreversible plastic strain increases, especially in the initial few cycles. The stored elastic strain energy has an important influence on transformation temperatures, the A5^σ decreases and the M5^σ increases with increasing number of thermomechanical cycles. The recovery strain, irreversible plastic strain, A5^σ , and M5^σ reach a saturation value after several cycles.

关键词： shape memory alloy tini thermomechanical cycling recovery strain transformation temperature

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Effects of Severe Plastic Deformation and Heat Treatment on Transformation Behavior of Explosively Welded Duplex tini-tini

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Petroleum Science 2007年第4期4卷 107-112页

作者： Li Juntao Zheng Yanjun Cui Lishan Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China

The effects of severe plastic deformation and heat treatment on the transformation behavior of explosively welded duplex tini-tini shape memory alloys （SMAs） were investigated by differential scanning calorimeter （DSC） measurements. The explosively welded duplex tini-tini plate of 0.7 mm thickness was cold-rolled at room temperature to a 60% reduction in thickness and then annealed at different temperatures for different durations. The results showed that low temperature （623-723K） heat-treatment led to the crystallization of the amorphous region, and re-crystallization occurred in the specimens annealed at higher temperatures （over 873 K）. Research indicated that the change of martensitic transformation temperature is due to the change of internal stresses with increasing heat treatment temperature. The change of annealing time also led to a change in martensitic transformation temperature, which was associated with the precipitation and decomposition of Ti3Ni4 in tini-1.

关键词： tini explosive welding cold rolling martensitic transformation differential scanning calorimeter

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EFFECT OF RESIDUAL STRESS ON THE MARTENSITIC TRANSFORMATION OF SPUTTER-DEPOSITED SMA THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 391-395页

作者： L.Wang,D.Xu and B.C.CaiInformation Storage Research Center, Shanghai Jiao Tong University, Shanghai 200030, China Manuscript received 14 September 2001 in revised form 27 November 2001 Info. Storage Res. Cent. Shanghai Jiaotong Univ. Shanghai 200030 China

tini thin films were sputter-deposited on circular single-crystal silicon substrates un-der various sputtering parameters. The crystal structure and residual stress of the as-deposited films were determined by X-ray diffraction and substrate-curvature method. The phenomenon of stress-suppressed martensitic transformation was observed. R is considered that the residual stresses in SMA thin films based on circular substrates act as balanced biaxial tensile stresses. The status of equilibrant delays the align-ment of self-accommodated variants and the volume shrinkage during the martensitic transformation.

关键词： martensitic transformation residual stress tini thin film shape memory alloy

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THE ACCURATE MOLECULAR FORMULA OF "Ti_(11)Ni_(14)"　PHASE

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 56-60页

作者： C.L.Chu G.J.Shen S.D.Wang B.Li S.G.Zhang Z.D.Yin Harbin Inst of Technology Harbin China

From the orientation relationship between 'Ti11Ni14' phase and matrix phase (B2),the accurate molecular formula of 'Ti11N14' phase has been derived in this paper. The results also show that the rhombohedral unit cell ... 详细信息

关键词： tini shape memory alloy self-propagating high-temperature synthesis (SHS)

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A Preparing Process of Quick-moving Leaf for tini Alloy

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Journal of Materials Science & Technology 1994年第5期10卷 389-390页

作者： Zichang SHAO Jingcheng WANG and Wei ZHANG (No. 1 Materials Research Dept., Shanghai Iron and Steel Research Institute, Shanghai, 200940, China)(To whom correspondence should be addressed) Shanghai Iron and Steel Research Inst Shanghai China

This paper reports a preparing process of quick moving leaf for tini shape memory alloy. Using the process. a series of quick moving leaves having different points of temperature. from 58 to 100℃. at which they jump up have been made. The quick moving leaves will be fully qualified as the electric switches that open and close themselves at proper temperatures.

关键词： tini A Preparing Process of Quick-moving Leaf for tini Alloy

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