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Research status and prospects of the fractal analysis of metal material surfaces and interfaces

International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe Cui Beijing Advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing laboratory of metallic materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China laboratory for Advanced materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

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Design, strength prediction of Ti35NbxSnyZrzMo alloys with low elastic moduli and experimental verification on their mechanical properties

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Rare Metals 2014年第6期33卷 657-662页

作者： Yu Wang Shi-Juan Dai Feng Chen Xin-Quan Yu You-Fa Zhang Jiangsu Key laboratory of Advanced metallic materials Southeast University

Based on the d-electron alloy design method and the average valence electron concentration theory,three kinds of metastable b-type Ti–35Nb-based alloys containing different quantities of Sn, Zr, and Mo alloying elements were designed, whose —Md = 2.45 e V and e/a = 4.24, and —Bo values = 2.869, 2.866, and 2.860,respectively. Meanwhile, a formula for predicting the solid solution strength of Ti–Nb-based alloys was developed using JMat Pro software. The experiments show that the designed alloys are all composed of single b phase after solid solution treatment, the tensile strength of the alloys coincides well with that predicted by the formula（the relative error ／4 %）, and the elastic moduli decrease with —Bo values increasing. The Ti35Nb3.7Zr1.3Mo alloy has the biggest —Bo value（2.869） and the lowest elastic modulus（54 GPa） among the three designed alloys.

关键词： Ti–Nb alloys Elastic modulus d-Electron alloy design

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Influence of oxygen content on the microstructure and mechanical properties of cold rolled Ti-32.5Nb-6.8Zr-2.7Sn-x O alloys after aging treatment

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Journal of materials Science & Technology 2018年第11期34卷 2100-2106页

作者： Chunbo Lan Feng Chen Huijuan Chen Yulong Wu Xiangwei Wu Jiangsu Key laboratory of Advanced metallic materials Southeast University

The influence of oxygen（O） content on the microstructure and mechanical properties of cold rolled Ti-32.5 Nb-6.8 Zr-2.7 Sn-xO（TNZS-xO; x = 0,0.***.0.6; mass%） alloys after aging at temperature range from 350 to 600℃ for 24 h was investigated. Results showed that the cold rolled TNZS-xO alloys possess single βphase. During the aging process, O could not only effectively suppress the precipitation of ω phase but also retard the formation and decomposition of a phase. In addition, the corresponding temperatures of the maximal volume fraction of α phase precipitation and the（α＋β）/β transus temperatures of the TNZS-xO alloys were all increased with the increasing of O content. For mechanical properties, it was found that the strength and Young＇s modulus of the TNZS-xO alloys increased owing to the ω phase and/or a phase precipitation and decreased owing to the a phase decomposition. However, the elongation showed the opposite change tendency with the above mentioned strength. The mechanical properties of TNZS-xO alloys can be controlled over a wide range by subjecting to aging treatment and/or changing their 0 content. When aged at or below 450 ℃,the TNZS-xO alloys exhibit great potential to become a series of new candidates for biomedical applications since they possess high strength（870-1460 MPa）, low Young＇s modulus（45.1-75.6 GPa）, high strength-to-modulus ratio（0.018-0.02） and appropriate elongation（7.2%-14.9%）, which are superior to those of Ti-6 Al-4 V alloy and suitable for the use as bio-implant materials.

关键词： Ti-32,5Nb-6.8Zr-2.7Sn-xO alloys Aging treatment Microstructure Mechanical properties

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Graded doping low internal loss 1060-nm InGaAs/AlGaAs quantum well semiconductor lasers

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Chinese Physics B 2015年第6期24卷 374-377页

作者：谭少阳翟腾张瑞康陆丹王圩吉晨 Key laboratory of semiconductors materials Institute of SemiconductorsChinese Academy of Sciences

Internal loss is a key internal parameter for high power 1060-nm InGaAs/A1GaAs semiconductor laser. In this paper, we discuss the origin of internal loss of 1060-nm InGaAs/GaAs quantum welt （QW） AIGaAs separate confinement het- erostructure semiconductor laser, and the method to reduce internal loss. By light doping the n-cladding layer, and stepwise doping the p-cladding layer combined with the expanded waveguide layer, a broad area laser with internal loss of 1/cm is designed and fabricated. Ridge waveguide laser with an output power of 350 mW is obtained. The threshold current and slope efficiency near the threshold current are 20 mA and 0.8 W/A, respectively.

关键词： internal loss free carrier absorption semiconductor laser

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Design and Fabrication of a 400 GHz InP-Based Arrayed Waveguide Grating with Flattened Spectral Response

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Chinese Physics Letters 2015年第5期32卷 55-58页

作者： ZHANG Xi-Lin LIU Song Tao LU Dan ZHANG Rui-Kang JI Chen Key laboratory of semiconductors materials Institute of SemiconductorsChinese Academy of Sciences

A four-channel 400 GHz channel spacing InP-based arrayed waveguide grating with a flattened wavelength re- sponse by employing a multimode interference coupler at the input waveguide of the filter is prepared. The fabricated devices show a flattened spectral response with a broadened 3-dB bandwidth up to 3.5 nm, interchan- nel non-uniformity of 〈0. 7dB and excellent match to the simulation results.

关键词： AWG InP Design and Fabrication of a 400 GHz InP-Based Arrayed Waveguide Grating with Flattened Spectral Response

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Effect of the addition of Mg, Ti, Ni on the decoloration performance of AlCrFeMn high entropy alloy

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Journal of materials Science & Technology 2019年第8期35卷 1629-1635页

作者： Shikai Wu Ye Pan Jie Lu Ning Wang Weiji Dai Tao Lu School of materials Science and Engineering Southeast UniversityJiangsu Key Laboratory for Advanced Metallic Materials

Due to the excellent mechanical properties of high entropy alloys(HEAs), they have attracted wide attention of materials researchers, but their functional properties have rarely been reported. In order to study the functional properties of HEAs, the decoloration of azo dye Direct Blue 6(DB6) using equiatomic AlCrFeMn and AlCrFeMn M(M=Mg, Ti, Ni) HEAs synthesized by mechanical alloying was reported in this work. The decoloration rate of DB6 by ball-milled(BM) AlCrFeMn was about 3 times faster than that of by BM MgZn-based amorphous alloy, which was the best one reported in the metallic glasses so far. In order to further improve the decoloration efficiency, we considered adding the fifth elements(Mg or Ti or Ni) to AlCrFeMn. Both of Mg and Ti could improve the decoloration performance of AlCrFeMn, but Ni played a negative role. The reaction activity of AlCrFeMnMg and AlCrFeMnTi was more than 2 and 1.2 times faster than that of AlCrFeMn. The effects of initial pH, temperatures and dye concentration on the decoloration efficiency of AlCrFeMnMg during reactions were systematically investigated. The reaction activity of AlCrFeMnMg in alkaline and acidic azo dye solution was about 37.5 and 16.6 times faster than that of neutral solution, respectively. This work had implications in reaching an attractive, low cost and efficient method for functional applications of HEAs.

关键词： Alloy design Environment properties Low cost materials synthesis Mechanical milling Mechanical properities

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Monolithic optical gates based on integration of evanescently-coupled uni-traveling-carrier photodiodes and electroabsorption modulators

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Chinese Physics B 2010年第7期19卷 333-337页

作者：张云霄廖栽宜赵玲娟潘教青朱洪亮王圩 Key laboratory of semiconductors materials Institute of SemiconductorsChinese Academy of Sciences

We report on chip-scale optical gates based on the integration of evanescent waveguide unitraveling-carrier photo- diodes （EC-UTC-PDs） and intra-step quantum well electroabsorption modulators （IQW-EAMs） on n-InP substrates. These devices exhibit simultaneously 2.1 GHz and -16.2 dB RF-gain at 21 GHz with a 450 t2 thin-film resistor and a bypass capacitor integrated on a chip.

关键词： electroabsorption modulator intra-step quantum wells uni-traveling-carrier RF-gain

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Relationship between dealloying conditions and coarsening behaviors of nanoporous copper fabricated by dealloying Cu-Ce metallic glasses

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Journal of materials Science & Technology 2018年第7期34卷 1162-1171页

作者： Ning Wang Ye Pan Shikai Wu School of materials Science and Engineering Southeast University Jiangsu Key Laboratory for Advanced Metallic Materials

Monolithic nanoporous copper （NPC） with tunable ligament size （107-438 nm） was synthesized by dealloying a new Cu-Ce binary glassy precursor in dilute H2 SO4 aqueous solution. The effects of the dealloying conditions on the morphologies of NPC were evaluated comprehensively. The results show that the ligaments of NPC can significantly coarsen with the increase of acid concentration, elevation of reaction temperature or prolongation of immersion time. These coarsening behaviors can be well described by a diffusion based growth kinetic model. Moreover, the surface diffusivity and activation energy for diffu- sion of Cu atoms were also estimated to investigate the formation mechanism of NPC, which is mainly governed by dissolution of Ce element in the glassy precursor coupled with nucleation and growth of Cu clusters via the precursor/solution interface. In the experiment of the degradation of methyl orange （MO） dye, the NPC fabricated by Cu-Ce metallic glasses exhibits superior sono-catalytic activity.2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials Science ＆ Technology.

关键词： Cu-Ce metallic glasses Nanoporous copper Dealloying Diffusion Sono-Fenton-like

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Azo dye degradation behavior of AlFeMnTiM(M = Cr, Co, Ni) high-entropy alloys

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International Journal of Minerals,Metallurgy and materials 2019年第1期26卷 124-132页

作者： Shi-kai Wu Ye Pan Ning Wang Tao Lu Wei-ji Dai School of materials Science and Engineering Southeast University Jiangsu Key Laboratory for Advanced Metallic Materials

Because of the potential carcinogenic effects and difficult degradation of azo dyes, their degradation has been a longstanding problem. The degradation of azo dye Direct Blue 6(DB6) using ball-milled(BM) high-entropy alloy(HEA) powders was characterized in this work. Newly designed AlFeMnTiM(M = Cr, Co, Ni) HEAs synthesized by mechanical alloying(MA) showed excellent performance in the degradation of azo dye DB6. The degradation efficiency of AlFeMnTiCr is approximately 19 times greater than that of the widely used commercial Fe–Si–B amorphous alloy ribbons and more than 100 times greater than that of the widely used commercial zero-valent iron(ZVI) powders. The galvanic-cell effect and the unique crystal structure are responsible for the good degradation performance of the BM HEAs. This study indicates that BM HEAs are attractive, valuable, and promising environmental catalysts for wastewater contaminated by azo dyes.

关键词： high entropy alloy mechanical alloying AlFeMnTiM degradation performance azo dye

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Effect of Si Content on Dynamic Recrystallization of Al-Si-Mg Alloys During Hot Extrusion

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Journal of materials Science & Technology 2014年第12期30卷 1271-1277页

作者： Yuna Wu Hengcheng Liao Jian Yang Kexin Zhou Jiangsu Key laboratory of Advanced metallic materials School of Materials Science and Engineering Southeast University

By using electron backscatter diffraction（EBSD） and transmission electron microscopy（TEM）, the effect of Si content on microstructure characteristics of three as-extruded Ale SieM g alloys was investigated. Results showed that the density of coarse Si particles played a critical role in dynamic recrystallization. Dynamic recrystallization rarely occurred in S1 alloy with less Si content; however, it happened in the Si-rich zones in S2 alloy with a medium Si content. And a mature recrystallization was observed in S3 alloy with high Si content. Although deformation was carried out at high temperature, particle-stimulated dynamic recrystallization occurred in Si-rich zones.

关键词： Al-Si-Mg alloys Electron backscatter diffraction(EBSD) Transmission electron microscopy(TEM) Dynamic recrystallization Hot extrusion

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