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Surface modification of Ti?49.8at%Ni alloy by Ti ion implantation: phase transformation, corrosion, and cell behavior  [PDF]
Yan Li,Ting Zhou,Peng Luo,Shuo-gui Xu
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1144-5
Abstract: The Ti?49.8at%Ni alloy was modified by Ti ion implantation to improve its corrosion resistance and biocompatibility. The chemical composition and morphologies of the TiNi alloy surface were determined using atomic force microscopy (AFM), auger electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS). The results revealed that Ti ion implantation caused the reduction of Ni concentration and the formation of a TiO2 nano-film on the TiNi alloy. The phase transformation temperatures of the Ti–TiNi alloy remained almost invariable after Ti ion implantation. Electrochemical tests indicated that the corrosion resistance of TiNi increased after Ti ion implantation. Moreover, the Ni ion release rate in 0.9% NaCl solution for the TiNi alloy remarkably decreased due to the barrier effect of the TiO2 nano-film. The cell proliferation behavior on Ti-implanted TiNi was better than that on the untreated TiNi after cell culture for 1 d and 3 d.
Surface modification and corrosion behaviour of Ni-Ti alloy used for urological implants  [PDF]
W. Kajzer,M. Kaczmarek,A. Krauze,J. Marciniak
Archives of Materials Science and Engineering , 2007,
Abstract: Purpose: The work presents the influence of the surface treatment of Ni-Ti alloy, intended for implants applied in urogenital surgery, on their corrosion resistance. The tests were carried out in the simulated urine. In particular, the pitting and crevice corrosion resistance tests were carried out.Design/methodology/approach: The corrosion tests were realized by recording of anodic polarization curves with the use of the potentiodynamic method. The VoltaLab PGP 201 system for electrochemical tests was applied. The tests were carried out in electrolyte simulating urine (pH = 5,6 ÷ 6,4) at the temperature of 37±1°C. The tests were carried out on samples of the following surfaces: grinded – average roughness Ra = 0,16 μm and electropolished and chemically passivated average roughness Ra = 0,10 μm.Findings: Surface condition of Ni-Ti alloys determines its corrosion resistance.Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the Ni-Ti alloy.Practical implications: On the basis of the obtained results it can be stated that Ni-Ti alloy can be applied in urology.Originality/value: The paper presents the influence of the surface treatment on corrosion resistance of Ni-Ti alloy.
Surface modification and corrosion resistance of Ni-Ti alloy used for urological stents  [PDF]
W. Kajzer,M. Kaczmarek,A. Krauze,J. Marciniak
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: The work presents the influence of the surface treatment of Ni-Ti alloy, intended for implants applied inurogenital surgery, on their corrosion resistance. The tests were carried out in the simulated urine at the temperature37±1oC and pH = 5.6÷6.4. In particular, the pitting and crevice corrosion resistance tests were carried out.Design/methodology/approach: The corrosion tests were realized by recording of anodic polarization curveswith the use of the potentiodynamic method. The VoltaLab PGP 201 system for electrochemical tests wasapplied. The tests were carried out in electrolyte simulating urine (pH = 5.6 ÷ 6.4) at the temperature of 37±1oC.Findings: Surface condition of metallic biomaterial determines its corrosion resistance.Research limitations/implications: The obtained results are the basis for the optimization of physicochemicalproperties of the Ni-Ti alloy.Practical implications: On the basis of the obtained results it can be stated that Ni-Ti alloy can be applied in urology.Originality/value: The paper presents the influence of the surface treatment on corrosion resistance of Ni-Ti alloy.
EFFECT OF Ti ON THE MICROSTRUCTURE AND ELECTROCHEMICAL PROPERTIES OF Zr-Mn-V-Ni ALLOYS
Ti对Zr—Mn—V—Ni系合金的微结构和电化学性能的影响

SONG Xueyan,LEI Yongquan,ZHANG Xiaobin,ZHANG Ze,CHEN Lixin,YANG Xiaoguang,LU Guanglie,ZHANG Wenkui,WANG Qidong Correspondent: SONG Xueyan,Tel,Fax:,E-mail: msecheny@dial zju edu cn,
宋雪雁
,雷永泉,张孝彬,张泽,陈立新,杨晓光,吕光烈,张文魁,王启东

金属学报 , 1998,
Abstract: The Zr-Ni intermetallic compounds coexist with Laves phase in the Zr-Mn-V-Ni alloy. Zr0.5Ti0.5Mn0.2Vo.6Ni1.2 alloy accommodates C14 Laves phase and Ti containing bcc phase. Selected area electron diffraction (SAED) and energy dispersive spectrum (EDS) analysis show the bcc phase was B2 type R phase (Ti0.8Zr0.2)Ni. The lattice parameters and substructure of Laves phase in ZrMn0.2V0.6Ni1.2 alloy varied after Ti substitution for Zr. Formation of non-Laves phases causes the alloying elements redistribution among the coexisting phases. The change of electrochemical properties of Zr0.5Ti0.5Mn0.2V0.6Ni1.2 can be attributed to the Ti substitution for Zr site in C14 laves phase, the formation of (Ti0.8Zr8.2)Ni phase and disappearance of Zr-Ni binarg compound.
Influences of heat treatment on the structure and electrochemical properties of Mg0.9Ti0.1Ni hydrogen storage alloys
Huang, HongXia;Huang, KeLong;Liu, SuQin;Chen, DongYang;Zhuang, ShuXin;
Journal of the Brazilian Chemical Society , 2009, DOI: 10.1590/S0103-50532009000900010
Abstract: in the present study, the effects of heat treatment on the structures and electrochemical properties of mg0.9ti0.1ni hydrogen storage alloys have been investigated in detail. x-ray diffraction (xrd) and scanning electron microscopy (sem) analyses showed that the samples exhibited a predominantly amorphous structure. electrochemical investigations revealed that heat treatment can improve the maximum discharge capacity and cyclic stability of the alloy electrodes. for mg0.9ti0.1ni alloy prepare by ball milling, the value of cmax was only 229.9 mah g-1, however, the value reached 331.9 mah g-1 after heat treatment at 873k for 8 h and then milling. the cycle voltammetry, electrochemical impedance spectroscopy and potentiodynamic polarization indicated that heat treatment not only increased the discharge capacity but also improved the charge/discharge kinetics of mg0.9ti0.1ni alloy.
STUDY ON Ti Ni La HYDROGEN STORAGE ALLOY
DM Zhang,ZYFu State Key Lab of Advanced Technology for Materials Synthesisand Processing,Wuhan University of Technology,Wuhan,China,
D.M. Zhang and Z.Y.Fu State Key Lab of Advanced Technology for Materials Synthesisand Processing
,Wuhan University of Technology,Wuhan,China

金属学报(英文版) , 1999,
Abstract: In ordertoimprovethe dischargecapacity of Ti2 Ni hydrogen storage alloy, the phases and effecton the property for Ti Nialloy with alittle La( La contentisbetween 5 25 wt% and12 62 wt%) were investigated in this paper. It is found that La exists in the form ofLaNi5 ,thesecond phase,in Ti Nialloy when La> 8 wt% . LaNi5 phasecaneffectivelyim provethe activity property and discharge capacity of Ti Ni alloy. While the soluble Ti inmain phase Ti2 Niisadverseto hydrogen adsorption desorption cycle and itshould be dimin ished .
Structure and Electrochemical Characteristics of Ti―V―based Solid Solution/AB5―type La―Mg―based Alloy Composite Hydrogen Storage Material
WANG Yan-Zhi, ZHAO Min-Shou
无机材料学报 , 2012, DOI: 10.3724/sp.j.1077.2012.00463
Abstract: Composite hydrogen storage alloy Ti0.10Zr0.15V0.35Cr0.10Ni0.30 + 5wt% La0.85Mg0.25Ni4.5Co0.35Al0.15 was prepared by two―step arc melting. X―ray diffractometry (XRD) and scanning electron microscope―energy dispersive spectroscopy (SEM―EDS) show that the main phase of the composite alloy consists of V―based solid solution phase with BCC structure and C14 Laves phase with hexagonal structure, while secondary phase also exists in the composite alloy. Electrochemical studies show that distinct synergetic effect appears during the composite process. The real maximum discharge capacity of the composite alloy electrode is 361.8 mAh/g at 303 K, and the low temperature dischargeability (LTD) of the composite alloy electrode is 4.05 times as high as that of the matrix alloy electrode at 233 K. The high rate dischargeability (HRD), the charge–transfer resistance (Rct) and the exchange current density (I0) of the composite alloy electrode are 26.87 % bigger, 37.25 mΩ lower and 115.45 mA/g higher than that of the matrix alloy electrode, respectively. The hydrogen diffusion coefficient (D) in the bulk of the composite alloy is 6.13×10―10 cm2/s bigger than that of the matrix alloy.
ELECTROCHEMICAL CYCLING STABILITY OF (Zr,Ti)(V,Mn,Pd,Ni,Fe)_2 HYDRIDE ELECTRODES
(Zr,Ti)(V,Mn,Pd,Ni,Fe)2系贮氢电极合金的循环稳定性

杨晓光,雷永泉,张文魁,朱光明,王启东
金属学报 , 1996,
Abstract: Zr1-yTiy)(V,Mn,Pd,Ni,Fe)2 hydride electrodes have higher electrochemical capacities(371 mA . h/g at a current of 50 mA/g and room temperature). The electrochemical capacities of electrodes decayed during cycling due to severe oxidation of 3d transition metals and selective dissolution of some alloy components, which brings lattice distortion of C14 Laves phase and lose of hydrogen storage ability. The decrease in Ti content is favourable to prolong the cycling lives of hydride electrodes.
WEAR RESISTANCE OF Ni-Ti ALLOY
Ni-Ti合金耐磨性研究

JIN Jialing,WANG Hongliang,
金嘉陵
,王宏亮

金属学报 , 1988,
Abstract: An elastic-plastic wear model for metal abrasion has been built up based oncomparing the dry abrasion behavior and high temperature hardness of Ni-Ti, Co45 and 38CrMoAlA alloys and studying the microstructure and the deformation character of Ni-Ti alloy. It wasused to interprete the nature of were resistance of Ni-Ti alloy which possesses low hardness andhigh elasticity.
ACTIVATION OF HYDROGEN-STORAGE ELECTRODE ALLOY Ml(Ni,Co,Mn,Ti)_5 PRODUCED BY GAS ATOMIZATION
气体雾化贮氢电极合金Ml(Ni,Co,Mn,Ti)5的活化性能

周煜,雷永泉,罗永春,成少安,王启东,张永昌
金属学报 , 1996,
Abstract: The electrochemical activation behaviours of the hydrogenstorage electrode alloys Ml(Ni,Co,Mn,Ti)5 produced by induction melting and then fornace cooling (FC) or Ar-gas atomizing (AGA) have been studied by comparing the activation of AGA electrodes aged at room temperature for 4 months with that of FC electrode. It is found that the surface oxide is only a minor factor to affect the activation, while the magnitude of internal energy change in the alloy before and after hydrogenation is the controlling factor. The increases in the internal energy of the alloy, caused by oxide and the H-atoms entering tetrahedral or octahedral sites during hydrogenation, make the activation difficult.
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