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Electrochemical Corrosion Behavior of the DLC Coated and Uncoated NiTi Alloys

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Journal of Materials Science & Technology 2006年第5期22卷 577-580页

作者： Jiehe SUI Wei CAI liancheng zhao School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

A dense and well-adhered diamond-like carbon （DLC） coating was prepared on the nickel-titanium （NiTi） alloys by plasma immersion ion implantation and deposition （PIIID）. Potentiodynamic polarization tests indicated the corrosion resistance of the NiTi alloys was markedly improved by the DLC coating. The Ni ions release of the NiTi alloys was effectively blocked by the DLC coating.

关键词： NiTi alloys Diamond-like carbon (DLC) Plasma immersion ion implantation and deposition (PIIID) Corrosion resistance

Shape Memory Effect of an Aged Fe-Mn-Si-Co-Mo Alloy

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Journal of Materials Science & Technology 1998年第2期14卷 182-184页

作者： Wang, Zhong Cai, Wei zhao, liancheng Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The effect of ageing on the microstructure, mechanical properties and shape memory effect (SME) in a newly developed Fe-24Mn-5Si-8Co-4Mo shape memory alloy has been studied. It was found that Fe//2Mo particles precipitate during ageing and thereby increase hardness and strength of the alloy. The SME of the alloy can be remarkably improved by ageing, and a maximum SME can be obtained when aged at 873 K. When the ageing temperature is over 873 K, the SME decreases with increasing the ageing temperature. The reason for the improvement of SME by ageing in the Fe-Mn-Si-Co-Mo alloy was discussed. (Edited author abstract) 9 Refs.

关键词： Shape memory effect

Effects of Anodic Voltages on Microstructure and Properties of Plasma Electrolytic Oxidation Coatings on Biomedical NiTi Alloy

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Journal of Materials Science & Technology 2013年第1期29卷 22-28页

作者： Jilin Xu Fu Liu Junming Luo liancheng zhao School of Materials Science and Engineering Nanchang Hangkong University School of Materials Science and Engineering Harbin Institute of Technology

Plasma electrolytic oxidation （PEO） coatings, formed under various anodic voltages （320-440 V） on biomedical NiTi alloy, are mainly composed of γ-AI203 crystal phase. The evolution of discharging sparks during the PEO process under different anodic voltages was observed. The surface and cross-sectional morphologies, composition, bonding strength, wear resistance and corrosion resistance of the coatings were investigated by scanning electron microscopy （SEM）, thin-film X-ray diffraction （TF-XRD）, energy dispersive X-ray spectrometry （EDS）, surface roughness, direct pull-off test, ball-on-disk friction and wear test and potentiodynamic polarization test, respectively. The results showed that the evolution of discharging sparks during the PEO process directly influenced the microstructure of the PEO coatings and further influences the properties. When the anodic voltage increased from 320 V to 400 V, the corrosion resistance and wear resistance of the coatings slowly increased, and all the bonding strength was higher than 60 MPa; further increasing the anodic voltages, especially up to 440 V, although the thickness and γ-AI203 crystallinity of the coatings further increased, the microstructure and properties of the coatings were obviously deteriorated.

关键词： Plasma electrolytic oxidation Biomedical NiTi alloy AI203 coating Anodic voltage

Preparation,Morphology and Damping Property of PU/UP Interpenetrating Polymer Networks

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Journal of Materials Science & Technology 2005年第4期21卷 585-588页

作者： Dongyan TANG Liangsheng QIANG Zheng JIN liancheng zhao Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Interpenetrating polymer networks （IPNs） composed of acrylate-modified polyurethane （PU）/unsaturated polyester （UP） resin via simultaneous polymerization with various component ratios of PU/UP were prepared. The polymerization processes of IPNs were traced through infrared spectrum （IR） techniques, by which the phase separation in systems could be controlled effectively. Results for the morphology and miscibility among multiple phases of IPNs, obtained by transmission electron microscope （TEM） indicated that the domains between two phases were constricted in nanometer scales. The dynamic mechanical thermal analyzer （DMTA） detection results revealed that the loss factor （tanS） and loss modulus （E″） increased with the polyurethane amounts in system, and the peak value in curves of tanδ and E″ appeared toward low temperature ranges. Maximum tanδ values of all samples were above 0.3 in the nearly 50℃ ranges. Also, the mechanical properties of PU/UP IPNs were studied in detail.

关键词： Interpenetrating polymer networks (IPNs) Nanocomposites Damping property Morphology

Isothermal martensitic transformation in Ti-Ni-Cu-Co shape memory alloy:Insight from a thermally activated kinetic model

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Journal of Materials Science & Technology 2023年第29期160卷 34-45页

作者： Hao Li Kuishan Sun Xianglong Meng Wei Cai liancheng zhao School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Recently the isothermal martensitic transformation in shape memory alloys(SMAs)has been reported in many literatures,and several models have been proposed to interpret the isothermal and athermal ***,the underlying mechanisms remain inadequately *** this work,the isothermal transformation from B2 to B19 is confirmed in Ti-Ni-Cu-Co melt-spun ribbons at the temperature range between M s and M *** reaches a saturation point at every isothermal temperature T iso,and the saturation points correspond to the f−T curve at the cooling rate of 0.5 K/*** experimental results indicate that the isothermal accumulation of martensite is a relaxation process from the transient state to the thermoelastic balance one.A thermally activated kinetic model is developed in this study to characterize the isothermal and athermal *** model is able to estimate the evolution of martensite volume fraction under any temperature path T(t)and it agrees with the experimental results *** to the model,the effects of elastic energy,nucleation density,and activation energy on the kinetics are *** those,a small nucleation density n i as well as a large activation energy Qwill result in a significant isothermal *** this work,the slighter isothermal effects originate from the higher value of n *** for the non-stoichiometric SMAs,the higher value of Qis responsible for the accumula-tion of martensite at the isothermal ***,the present work provides a novel view from a kinetic model to understand the isothermal martensitic transformation in SMAs.

关键词： Shape memory alloys Thermoelastic martensitic transformation Kinetics Thermal activation

Structure and properties of Li-rich Zn-doped LiNbO_3 Crystal

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High Technology Letters 2001年第2期7卷 95-96页

作者：甄西合 Wang Rui Qiang Liangsheng zhao liancheng Harbin Institute of Technology Harbin 150001 P.R.ChinaCrystal Material National Major Laboratory Shangdong University Harbin Institute of Technology

The Li-rich Zn-doped LiNbO 3 (LN) crystals were grown by the Czochralski method. The structure of the crystals was measured by ultraviolet-visible absorption spectra. The results indicated that the Li-rich Zn-doped LN crystals had the same characteristics as the pure LN crystal. After Zn 2+ entered into the lattice of Li-rich Zn-doped LN crystal, it replaced Nb Li firstly. When there was no Nb Li , Zn 2+ replaced Li + then. The second harmonic generation (SHG) property of Li-rich Zn-doped LiNbO 3 crystal was measured. The results showed that the SHG conversation efficiency of Li-rich Zn-doped LiNbO 3 crystals was higher than that of Zn-doped LiNbO 3 crystals.

关键词： Li-rich Zn-doped LN crystal the Czochralski method Crystal structure Second harmonic generation

Microstructure evolution and superelasticity behavior of Ti-Ni-Hf shape memory alloy composite with multi-scale and heterogeneous reinforcements

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Journal of Materials Science & Technology 2020年第7期42卷 113-121页

作者： Xiaoyang Yi Bin Sun Weihong Gao Xianglong Meng Zhiyong Gao Wei Cai liancheng zhao School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

In the present study,the in-situ TiB whisker was introduced into the Ti-Ni-Hf shape memory alloy composite by the in-situ reaction of the Ti-Ni-Hf alloy powder and TiB2 ***(Ti,Hf)2 Ni phase also precipitated,accompanied with the formation of TiB ***,the residual TiB2 particles can be observed,as the TiB2 content was higher than 0.7 wt%.Thereinto,the larger scale reinforcements constituted the quasi-continuous network *** smaller scale reinforcements distributed in the interior of the network *** two-scale reinforcements showed the uniform distribution at macroscopic level and inhomogeneous distribution at microscopic *** single stage B19?B2 martensitic transformation occurred in the Ti-Ni-Hf *** addition,the martensitic transformation temperatures continuously decreased with the increased TiB2 content owing to the compositional and mechanical *** moderate TiB2 addition not noly enhanced the matrix strength,but also significantly improved the *** excellent superelaticity with the completely recoverable strain of 4%can be obtained in the Ti-Ni-Hf composite containing 0.7 wt%TiB2.

关键词： Ti-Ni-Hf composite Shape memory alloy Microstructure Martensitic transformation High temperature superelasticity

Phase Transformation and Thermal Stability of Aged Ti-Ni-Hf High Temperature Shape Memory Alloys

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Journal of Materials Science & Technology 2006年第5期22卷 691-695页

作者： Xianglong MENG Wei CAI K.T.Lau L.M.Zhou liancheng zhao School of Materials science ＆ Engineering Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering The Hong Kong Polytechnic umversity Hung Horn KowloonHong Kong China

The use of Ni-rich TiNiHf alloys as high temperature shape memory alloys （SMAs） through aging has been presented. For Ni-rich Ti80-xNixHf20 alloys, their phase transformation temperatures are averagely increased more than 100 K by aging at 823 K for 2 h. Especially for the alloys with Ni-content of 50.4 at. pct and 50.6 at. pct, their martensitic transformation start temperatures （Ms） are more than 473 K after aging. TEM observation confirmed that some fine particles precipitate from the matrix during aging. The aged Ni-rich TiNiHf SMAs show the better thermal stability of phase transformation temperatures than the solutiontreated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.

关键词： TiNiHf alloy High temperature shape memory alloy Aging Phase transformation

Recovery Stress in a Ni-Ti-Nb Shape Memory Alloy with Wide Transformation Hysteresis

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Journal of Materials Science & Technology 1994年第1期10卷 27-30页

作者： Wei CAI Chunsheng ZHANG and liancheng zhao(Harbin Institute of Technology, Harbin, 150006, China) Harbin Inst of Technology Harbin China

The effect of deformation on recovery stress of Ni144.7Ti46.3Nb9 alloy has been studjed using tensile test at various temperatures and TEM observation. It ls shown that the recovery stress increases with jncreasing total strain ET and reaches a maximum value (max) as ET= 9% but the maximum recov erV strain of the alloy is only about 4.6%. This is different from that of Ti-Ni binary alloy in which is obtained usually at maximum recovery strain and the reason of the difference is dis Cussed. Deformation temperature Td has a little effect on recovery stress when Td is less than Ms However, recovery stress decreases sharply when Td is higher than M, and lowers approximately down to zero near Msσ

关键词： Ti Wide Recovery Stress in a Ni-Ti-Nb Shape Memory Alloy with Wide Transformation Hysteresis HL Ni