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1 INTRODUCTIONOwingtolowdensityandhighspecificstrength ,aluminumanditsalloysareextensivelyusedinmanyfields ,especiallyinaviationandspaceindustry .Butlowhardnessandlowwearresistanceoftenlimittheirengineeringapplications .Surfacemodificationforalu minumanditsalloysbyionimplantationoffersthepossibilityofwideningtheirapplicationswherehighwearresistanceandlowdensityarerequired[15] .Sincenitrogenionisconvenienttoobtainandeasytocontrol,andAlNhasexcellentmechanicalproperties ,nitrogenionimplant… 相似文献
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Cu-W thin film with high W content was deposited by dual-target DC-magnetron co-sputtering technology. Effects of the substrates surface treating technique on the adhesive strength of Cu-W thin films were studied. It is found that the technique of ion beam assisting bombardment implanting of W particles can remarkably improve the adhesive property of Cu-W thin films. Indentation and scratching test show that, the critical load is doubled over than the sample only sputter-cleaned by ion beam. The enhancing mechanism of ion beam assisting bombardment implanting of Cu-W thin films was analyzed. With the help of mid-energy Ar^+ ion beam, W atoms can diffuse into the Fe-substrate surface layer; Fe atoms in the substrate surface layer and W atoms interlace with one another; and microcosmic mechanical meshing and diffusing combination on atom-scale among the Fe and W atoms through the film/substrate interface can be formed. The wettability and thermal expansion properties of the W atoms diffusion zone containing plentiful W atoms are close to those of pure W or W-based Cu-W film. 相似文献
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用氩离子对35CrMo钢离子硫氮在碳共渗层进行了阴极溅射,通过金相观察,显微硬度测定,X射线衍射相结构分析,电子探针氮碳硫分布,分析了阴极溅射对离子硫碳共渗层的影响,结果表明,阴极溅使共渗层中ε相和γ′相减少,白亮层呈典型粒状晶形貌,沿渗层深度氮碳的分布变化,峰值下降,次表层氮碳含量增加,离子硫氮碳共渗与阴极溅射良好的匹配,可使共渗硬化效果显著,渗层厚度增加。 相似文献
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A.I. Kalinichenko 《Surface & coatings technology》2007,201(13):6090-6094
In order to explain atomic rearrangements in the target material, which is far deeper than the penetration depth of implanted ions, the acoustic action of low-energy (≤ 1 keV) ions on point defects in a diamond-like carbon (DLC) target was investigated. The total amplitude of the stress pulse generated due to the transfer of energy, momentum and volume from an incident ion to the target material is found, using a spherical approximation of the thermoelastic peak — the nanometric region where the phonon energy loss of the ion is thermalized. The spatial dependence of the amplitude of the generated pulse adjusted for sound absorption follows a power law rather than an exponential law. Due to such long-range action, the acoustic pulses from the ions of C+, Ar+ and Xe+ bombarding the DLC target can activate migration of defects at depths up to 50 nm and considerably reduce the activation energy of kinetic process at depths up to 300 nm. The dependence of the maximum depth of defect activation on the type of defect and on the energy of the ion was investigated for two typical values of the activation energy. The model was used to explain experimental data concerning the modification of optical properties of amorphous sp2-bond carbon films by 1.2 keV Ar+ ions. 相似文献
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在能量为3,5和7keV的氩离了轰击下,对激冷Ni-50%Al(质量分数)合金薄膜进行减薄,用配备有超薄窗口能谱仪的高分辨电镜观察分析了减薄后样品中两种合金相Ni2Al3和NiAl3的结构和成分变化。结果表明,在离子轰击下,合金相Ni2Al3和NiAl3的成分均有变化,Ni含量明显高于合金相化学配比。随着离子能量的降低,轰击后合金相中Ni含量增加。在3keV氩离子轰击下两个相的含Ni量均高达87%(原子分数)左右,在离子轰击过程中初始的NiAl3相点阵结构未发生明显变化,而Ni2Al3的初如结构在3和5keV氩离子轰击减薄后部分转变为体心立方结构。 相似文献
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CHEN Fei ) ZHOU Hai) CAI Suo) LV Fanxiu) and LI Chengming) ) College of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing China ) Materials Science Engineering School University of Science Technology Beijing Beijing China 《稀有金属(英文版)》2007,26(2):142-146
Magnesium alloys have a wide range of applications in industry; however, their corrosion resistance, wear resistance, and hardness are rather poor, which limit their applications. Ti ion was implanted into the AZ31 magnesium alloy surface by metal vapor vacuum arc (MEVVA) implanter. This metal arc ion source has a broad beam and high current capabilities. The implantation energy was fixed at 45 keV and the dose was at 9 × 1017 cm?2. Through ion implantation, Ti ion implantation layer with approximately 900 nm in thickness was directly formed on the surface of AZ31 magnesium alloy, by which its surface property greatly improved. The chemical states of some typical elements of the ion implantation layer were analyzed by means of X-ray photoelectron spectroscopy (XPS), while the cross sectional morphology of the ion im-plantation layer and the phase structure were observed by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The property of corrosion resistance of the Ti ion implanted layer was studied by the CS300P electrochemistry corrosion workstation in 3.5% NaCl solution. The results showed that the property of corrosion resistance was enhanced remarkably, while the corrosion velocity was obviously slowed down. 相似文献
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The tribological properties especially wear and hardness of a Ti-Al-V alloy with nitrogen implantation (energy 60 keV) were investigated. The implantation was carried out at fluences range from 1×1016 to 4×1017 ions/cm2. Glancing angle X-ray diffraction (GAXRD) and X-ray photoelectron spectroscopy (XPS) analyses were performed to obtain surface characterization of the implanted sample. The unimplanted and implanted samples were also annealed at 600 ℃ in order to understand the influence of annealing on the tribological properties of Ti-Al-V. The hardness shows significant improvement at the higher fluence. After annealing at 600 ℃, the friction coefficient exhibits a relative decrease for the nitrogen-implanted samples. In addition, the wear rates of the implanted samples exhibits a great decrease after annealing at 600 ℃. Nature of the surface and reason for the variation and improvement in wear resistance were discussed in detail. 相似文献
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采用射频反应磁控溅射法在Mo电极上沉积了AlN薄膜.研究了溅射气压、靶基距、溅射功率、衬底温度及N_2含量等不同工艺条件对AlN薄膜择优取向生长的影响.用XRD分析了薄膜的择优取向,用原子力显微镜、高分辨场发射扫描电镜表征了薄膜的形貌.实验结果表明,靶基距和溅射气压的减小,衬底温度及溅射功率的升高有利于AlN(002)晶面的择优取向生长.氮氩比对AlN薄膜择优取向生长影响较小,N_2≥50%(体积分数)时均可制得高c轴择优取向的AlN薄膜.经优化工艺参数制备的AlN柱状晶薄膜适用于体声波谐振滤波器的制备. 相似文献
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Effects of Ti, Hf, Nb and W alloying elements addition on the microstructure and the mechanical behaviors of NiAl-Cr(Mo) intermetallic alloy were investigated by means of XRD, SEM, EDX and compression tests. The results show that Ni-31Al-30Cr-4Mo-2(Ti, Hf, Nb, W) alloy consists of four phases: NiAl, α-Cr solid solution, Cr2Nb and Ni2Al(Ti, Hf). The mechanical properties are improved significantly compared with the base alloy. The compression yield strength at 1 373 K is 467 MPa and the room temperature compression ductility is 17.87% under the strain rate of 5.56×10-3 s-1, due to the existence of Cr2Nb and Ni2Al(Ti, Hf) phases for strengthening and Ti solid solution in NiAl matrix and coarse Cr(Mo, W) solid solution phase at cellular boundaries for ductility. The elevated temperature compression deformation behavior of the alloy can be properly described by power-law equation: ε =0.898 σ8.47exp[-615/(RT)]. 相似文献
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为了得到高质量的纳米薄膜,对直流磁控溅射法制备Ni-Ti薄膜工艺进行了研究。采用单晶硅和玻璃两种基体材料,并在不同的基体温度、晶化温度、溅射功率等条件下制备薄膜。之后对薄膜进行了XRD,SEM分析。分析结果表明:薄膜成分、厚度、表面形貌、致密度与溅射功率、基体温度、晶化温度、基体材料密切相关。并根据实验结果给出优化的纳米Ni-Ti薄膜制备工艺。 相似文献
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Various doses of nitrogen ions were implanted into the surface of pure titanium, Ti6Al7Nb and Ti6Al4V, by plasma immersion ion implantation. Torsional fretting wear tests involving flat specimens of no-treated and treated titanium, as well as its alloys, against a ZrO2 ball contact were performed on a torsional fretting wear test rig using a simulated physiological medium of serum solution. The treated surfaces were characterized, and the effect of implantation dose on torsional fretting behavior was discussed in detail. The results showed that the torsional fretting running and damage behavior of titanium and its alloys were strongly dependent on the dose of the implanted nitrogen ions and the angular displacement amplitude. The torsional fretting running boundary moved to smaller angular displacement amplitude, and the central light damage zone decreased, as the ion dose increased. The wear mechanisms of titanium and its alloys were oxidative wear, abrasive wear and delamination, with abrasive wear as the most common mechanism of the ion implantation layers. 相似文献
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铝合金表面氮和钛等离子体基离子注入改性层XPS研究 总被引:2,自引:1,他引:2
用XPS(X射线光电子能谱 )和GXRD(小掠射角X射线衍射 )研究了铝合金等离子体基离子注入氮再注入钛最后复合注入氮和钛改性层的成分分布及相结构 ,并用Gaussian Lorentzion峰位拟合方法分析了改性层中不同深度处各元素的化学态及其在相结构中的分布。结果表明 ,复合改性层的表层有较高浓度的氮和钛 ,次表层有较高浓度的钛及一定浓度的氮 ,铝 /钛界面有较宽的过渡区 ,基体中氮呈高斯分布。改性层主要由TiN ,TiO2 ,α Ti,TiAl3 ,Al2 O3 和AlN等组成 ,氮和氧还以固溶态的形式存在。最表层含有大量TiN及部分TiO2 ;次表层含有大量α Ti及许多TiN ;过渡层由TiO2 ,TiN ,TiAl3 ,Al2 O3 和AlN等组成 ;注氮层包括AlN ,Al2 O3 及α(Al)。各元素在相应相结构中的浓度分布与其成分深度分布基本相似。 相似文献
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The wear resistance and wear mechanism of AZ31 magnesium alloy irradiated by high-intensity pulsed ion beam (HIPIB) at an ion current density of 100 A/cm2 with shot number from one to ten are investigated by dry sliding wear tests. The cross-sectional microstructure and surface microhardness of the irradiated AZ31 magnesium alloys are examined by optical microscopy (OM) and Vickers tester, respectively. It is found that surface hardness increased with increasing shot number, from an original value of 570 MPa to a maximal value of 820 MPa with ten shots, and the wear rate of the samples irradiated with five and ten shots was about one order of magnitude less than that of the original sample. The transition from severe metallic wear to mild oxidative wear induced by HIPIB irradiation was identified through a combined analysis in surface morphology and chemical composition of wear tracks, mechanically mixed materials, wear debris and wear scars of counterface steel ball by using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA), which is mainly attributed to the significant increase in microhardness resulting from grain refinement on the irradiated surface. 相似文献
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利用正交设计试验探讨了基体温度、偏压、溅射时间、沉积时间对ZL109表面沉积TiN涂层时,对薄膜显微硬度和膜/基结合力的影响.结果表明,在ZL109表面多弧离子镀制备TiN薄膜的最佳工艺为:基体温度260 ℃、偏压200 V、沉积时间30 min、溅射时间8 min、Ti靶电流80 A、炉内总压1 Pa(Ar和N_2流量比为1∶2).在此工艺下制备的TiN薄膜显微硬度达到1500 HV0.05,膜/基结合力达到36 N,膜厚约2~3 μm. 相似文献
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Nitrogen ion implantation and in vitro corrosion behavior of as-cast Ti-6Al-7Nb alloy 总被引:2,自引:0,他引:2
L. ThairU.Kamachi Mudali N. BhuvaneswaranK.G.M. Nair R. AsokamaniB. Raj 《Corrosion Science》2002,44(11):2439-2457
In the present investigation, surface modification of Ti-6Al-7Nb alloy with nitrogen ions is considered as a method to improve its performance with respect to corrosion. Nitrogen ion was implanted on Ti-6Al-7Nb alloy at an energy of 70 and 100 keV using a 150 keV accelerator at different doses between 1×1016 and 3×1017 ions/cm2. Gracing incidence X-ray diffraction was employed on the implanted specimens to understand the phases formed with increasing doses. The implanted samples were subjected to electrochemical study in Ringer's solution in order to determine the optimum dose that can give good corrosion resistance in a simulated body fluid condition. The OCP of the implanted specimens were found to shift in the noble direction in comparison with unimplanted specimen. The passive current density and area of the repassivation loop were found to decrease as the dose values increased. The electrochemical impedance spectroscopic results indicate that the polarization resistance was higher for the dose of 2.5×1017 ions/cm2 implanted at both energy of 70 and 100 keV. Nitrogen ion implantation enhanced the passivability and reduces the corrosion kinetics of the alloy surface with increasing tendency for repassivation. Nature of the surface and reason for the variation and improvement in corrosion resistance are discussed in detail. 相似文献
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应用χ射线衍射分析研究了极间距对PEMSIP法TiN涂层相互组成的影响,结果表明,随着极间距增加,涂层相组成朝着富氮相及其含量增加的方向发展,变化趋势为:(αTi+Ti2N+TiN)→(Ti2N+TiN)→TiN。极间距对TiN涂层硬度的影响是由其影响涂层相组成而引起的,其中,由Ti2N和TiN两相组成的涂层硬度最高。 相似文献