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Electrochemical Corrosion Behavior of the DLC Coated and Uncoated niti alloys

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

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Highly porous niti alloys produced by sintering elemental Ni and Ti powders with NaCl as space-holder

Highly porous NiTi alloys produced by sintering elemental Ni...

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第八届中国功能材料及其应用学术会议

作者： WEI Long-sha ZHANG Xue-xi QIAN Ming-fang GENG Lin School of Materials Science and Engineering Harbin Institute of Technology

Biocompatible porous Ni50.5Ti49.5 alloys possess shape memory and superelastic effects and high damping *** niti foam of porosity70%was fabricated by replication of NaCl space-holder employing pressureless sintering Ni and Ti elemental *** sintering of the foam was achieved assisted by transient liquid phase formation due to the exothermic reaction between Ni and *** space holders were removed during sintering procedure leaving homogeneously pores in the *** foam sustains compressive strains as high as 6.27%when load in the austenite state,with as high as78.0%recovery ratio when *** capacities(tanS) of austenite and martensite are 0.03 and0.045,*** initiation critical strain increases from 7%in as-sintered state to 25%after ageing due to twinning of martensite *** of mechanical and damping properties on the foam microstructure and pore architecture was *** highly porous,cost-effective niti alloy shows application potentials as bone implant and energy absorntion materials.

关键词： Shape memory alloys niti alloys Foam Sintering Superelasticity Internal friction

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Mechanical behavior and deformation mechanism of shape memory bulk metallic glass composites synthesized by powder metallurgy

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Journal of Materials Science & Technology 2022年第19期114卷 42-54页

作者： Tianbing He Tiwen Lu Daniel Sopu Xiaoliang Han Haizhou Lu Kornelius Nielsch Jürgen Eckert Nevaf Ciftci Volker Uhlenwinkel Konrad Kosiba Sergio Scudino Leibniz IFW Dresden Institute for Complex MaterialsHelmholtzstraße 2001069 DresdenGermany Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of TechnologyGuangzhou 510640China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Leibniz IFW Dresden Institute for Metallic MaterialsHelmholtzstraße 2001069 DresdenGermany TU Dresden Institute of Materials Science01062 DresdenGermany TU Dresden Institute of Applied Physics01062 DresdenGermany Department Materials Physics Montanuniversität LeobenJahnstraße 12A-8700 LeobenAustria Leibniz Institute for Materials Engineering IWT 28359 BremenGermany University of Bremen Faculty of Production Engineering28359 BremenGermany

The synthesis of martensitic or shape-memory bulk metallic glass composites(BMGCs)via solidification of the glass-forming melts requires the meticulous selection of the chemical composition and the proper choice of the processing parameters in order to ensure that the glassy matrix coexists with the desired amount of austenitic ***,a relatively limited number of such systems,where austenite and glassy matrix coexist over a wide range of compositions,is ***,we study the effective-ness of powder metallurgy as an alternative to solidification for the synthesis of shape memory ***_(48)Cu_(36)Al_(8)Ag_(8)matrix composites with different volume fractions of Ni_(50.6)Ti_(49.4)are fabricated using hot pressing and their microstructure,mechanical properties and deformation mechanism are investigated employing experiments and *** results demonstrate that shape-memory BMGCs with tun-able microstructures and properties can be synthesized by hot *** phase stability of the glass and austenitic components across a wide range of compositions allows us to examine fundamental as-pects in the field of shape memory BMGCs,including the effect of the confining stress on the martensitic transformation exerted by the glassy matrix,the contribution of each phase to the plasticity and the mechanism responsible for shear band *** present method gives a virtually infinite choice among the possible combinations of glassy matrices and shape memory phases,expanding the range of accessible shape memory BMGCs to systems where the glassy and austenitic phases do not form simul-taneously using the solidification route.

关键词： Metallic glass composites niti alloys Mechanical properties Shear bands Martensitic transformation

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Characterization of PEG-Like Macromolecular Coatings on Plasma Modified niti Alloy

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Plasma Science and Technology 2008年第2期10卷 189-192页

作者：杨隽高家诚常鹏汪建华 College of Material Science and Engineering Chongqing University Chongqing 400044 China School of Materials Science and Engineering Wuhan Institute of Technology Wuhan 430073 China College of Material Science and Engineering Chongqing University Chongqing 400044 China School of Materials Science and Engineering Wuhan Institute of Technology Wuhan 430073 China

A poly（ethylene glycol）（PEG-like） coating was developed to improve the biocom- patibility of Nickel-Titanium （niti） alloy implants. The PEG-like macromolecular coatings were deposited on niti substrates at a room temperature of 298 K through a ECR （electron-cyclotron resonance） cold-plasma enhanced chemical vapor deposition method using tetraglyme （CH3-O- （CH2-CH2-O）4-CH3） as a precursor. A power supply with a frequency of 2.45 GHz was applied to ignite the plasma with Ar（argon） used as the carrier gas. Based on the atomic force microscopy （AFM） studies, a thin smooth coating on niti substrates with highly amorphous functional groups on the modified niti surfaces were mainly the same accumulated stoichiometric ratio of C and O with PEG. The vitro studies showed that platelet-rich plasma （PRP） adsorption on the modified niti alloy surface was significantly reduced. This study indicated that plasma surface modification changes the surface components of niti alloy and subsequently improves its biocompatibility.

关键词： PEG-like coatings cold-plasma niti alloys modification biocompatibility

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Electrically Actuated Shape Recovery of niti Components Processed by Laser Powder Bed Fusion after Regulating the Dimensional Accuracy and Phase Transformation Behavior

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第4期1卷 100-111页

作者： Luhao Yuan Dongdong Gu Kaijie Lin He Liu Jianfeng Sun Jiankai Yang Xin Liu Wei Chen Yingjie Song Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing210016China

To develop self-recovery intelligent components based on resistance heating and obtain satisfactory performance in practical applications,this study optimized the forming quality,dimensional accuracy,and phase transformation temperatures of Nickel-titanium(niti)alloys by controlling the process *** tensile properties and shape-memory effects of the niti alloys prepared using the optimized process were *** relationship between the change in temperature and the shape recovery process of the deformed structure under electrical excitation was *** results show that the suitable processing window for ensuring the forming quality without noticeable distortion and macro cracks depends on the laser *** both the X and Y directions,the measured dimensions increased with an increase in laser power and first decreased and then stabilized with an increase in scanning *** XRD results showed that all the as-built samples consisted of B2 austenite and B19’martensite phases and *** tests suggested that excellent tensile properties with a tensile strength of 753.28 MPa and elongation of 6.81%could be obtained under the optimal parameters of 250 W and 1200 mm/*** excellent shape-recovery rate of 88.23%was achieved under the optimal ***,chiral lattice structures were successfully fabricated by laser powder bed fusion(LPBF)under the optimal parameters,and a shape-recovery rate of 96.7%was achieved under electrical actuation for a structure with a pre-compressed strain of 20%.This study also found that the temperatures at the grasp regions were always higher than those at other positions because of the generation of contact resistance at the grasp *** facilitates the rapid recovery of the structure at the grasp regions,which has important implications for the design iteration of niti smart components.

关键词： Additive manufacturing(AM) Laser powder bed fusion(LPBF) niti alloys Processing window Shape-memory effects Electrical actuation

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Novel Class of Additive Manufactured niti-Based Hierarchically Graded Chiral Structure with Low-force Compressive Actuation for Elastocaloric Heat Pumps

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第2期2卷 54-65页

作者： Xin Peng Luhao Yuan Donghua Dai Yu Liu Dongya Li Dehui Zhu Ziyu Fang Chenglong Ma Dongdong Gu Meiping Wu Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology School of Mechanical EngineeringJiangnan UniversityWuxi214122China Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing Wuxi214122China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing210016China Sino-French Engineer School Nanjing University of Science and TechnologyNanjing210094China

Elastocaloric refrigeration is the most promising green solid-state refrigeration technology to replace conventional vapor compression *** development direction of the elastocaloric component that acts as a key part of the elastocaloric refrigeration system contains a large elastocaloric effect,low stress hysteresis,high heat exchange performance,and small driving *** first two indices can be realized by material modification;however,the last two are more dependent on a novel porous structure ***,the conventional porous structure is confronted with some critical challenges,including inhomogeneous stress,a significant hysteresis area,and deformation instability under the alternating cyclic *** this study,a niti-based elastocaloric structure model with chirality feature and gradient design as innovative elements was presented,bio-inspired by the structure of the plant tendrils.A quantitative optimization for the niti-based elastocaloric structure was performed using the finite element analysis(FEA)*** and martensite volume fraction(MVF)fields during the loading and unloading processes were predicted and *** simulated results indicated that increasing the thickness gradient g_(1) of the strip or decreasing the diameter gradient g_(2) of the structure was beneficial to achieving more homogeneous strain and martensite distribution,simultaneously with higher energy storage efficiency and specific surface *** addition,these niti-based chiral structures with different structural parameters were fabricated by laser powder bed fusion(LPBF).At the optimized structure parameters of g_(1)=2 and g_(2)=1.11,the LPBF-fabricated niti-based chiral structure could achieve an adiabatic temperature change ΔT_(ad) of 2.3 K,driving force of as low as 149.11 N,and|ΔT_(ad)/F|of as high as 15.42 K/kN at a recoverable compressive strain of 10%.

关键词： Laser powder bed fusion niti alloys Elastocaloric effect Chiral structure

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