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Optical Characterization of rf-magnetron Sputtered Nanostructured SnO2 Thin Films

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Chinese Physics Letters 2009年第7期26卷 316-319页

作者： Abdul Faheem Khan mazhar mehmood A. m. Rana m. T. bhatti A. mahmood National Centre for Nanotechnology Department of Chemical and Materials Engineering Pakistan Institute of Engineering and Applied Sciences (PIEAS) Islamabad 45650 Pakistan Department of Physics Bahauddin Zakariya University Multan 60800 Pakistan NILOP Islamabad 45650 Pakistan

Tin oxide （Sn02 ） thin films are deposited by rf-magnetron sputtering and annealed at various temperatures in the range of 100-500 ℃ for 15 min. Raman spectra of the annealed films depict the formation of a small amount of SnO phase in the tetragonal Sn02 matrix, which is verified by x-ray diffraction. The average particle size is found to be about 20-30 nm, as calculated from x-ray peak broadening and SEm images. Various optical parameters such as optical band gap energy, refractive index, optical conductivity, carrier mobility, carrier concentration etc. are determined from the optical transmittance and reflectance data recorded in the wavelength range 250-2500 nm. The results are analyzed and compared with the data in the literature.

关键词： NANOCRYSTALLINE SNO2 RAmAN-SCATTERING LOW-TEmPERATURE TIN OXIDE OXYGEN OXIDATION

Design and optimization of the composition and mechanical properties for non-equiatomic CoCrNi medium-entropy alloys

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Journal of materials Science & Technology 2023年第8期139卷 232-244页

作者： J.X.Yan z.J.zhang P.zhang J.H.Liu H.Yu Q.m.Hu J.B.Yang z.F.zhang Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering Chongqing Jiaotong UniversityChongqing 400074China chool of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of materials Science and Engineering Northeastern UniversityShenyang 110819China School of Information Science and Engineering Shenyang University of TechnologyShenyang 111003China

The development of multi-principal element alloys(mPEAs,also called as high-or medium-entropy al-loys,HEAs/mEAs)provides tremendous possibilities for materials ***,designing mPEAs with desirable mechanical properties confronts great challenges due to their vast composition *** this work,we provide an essential criterion to efficiently screen the CoCrNi mEAs with outstanding strength-ductility *** negative Gibbs free energy difference△E_(FCC-BCC)between the face-centered cubic(FCC)and body-centered cubic(BCC)phases,the enhancement of shear modulus G and the decline of stacking fault energy(SFE)γ_(isf)are combined as three requisites to improve the FCC phase stability,yield strength,deformation mechanisms,work-hardening ability and ductility in the *** effects of chemical composition on△E_(FCC-BCC),G andγisf were investigated with the first principles calculations for Co_(x)Cr_(33)Ni_(67-x),Co_(33)Cr_(y)Ni_(67-y)and Co_(z)Cr_(66-z)Ni_(34)(0≤x,y≤67 and 0≤z≤66)*** on the essential criterion and the calculation results,the composition space that displays the neg-ative Gibbs free energy difference△E_(FCC-BCC),highest shear modulus G and lowest SFEγ_(isf)was screened with the target on the combination of high strength and excellent *** this context,the optimal composition space of Co-Cr-Ni alloys was predicted as 60 at.%-67 at.%Co,30 at.%-35 at.%Cr and 0 at.%-6 at.%Ni,which coincides well with the previous experimental evidence for Co_(55)Cr_(40)Ni_(5)*** valid-ity of essential criterion is further proved after systematic comparison with numerous experimental data,which demonstrates that the essential criterion can provide significant guidance for the quick exploitation of strong and ductile mEAs and promote the development and application of mPEAs.

关键词： medium-entropy alloys First-principles calculations Phase stability Stacking-fault energy Strength Ductility

High strength Al-Cu-mg based alloy with synchronous improved tensile properties and hot-cracking resistance suitable for laser powder b e d fusion

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Journal of materials Science & Technology 2023年第10期141卷 155-170页

作者： Q.z.Wang N.Kang X.Lin m.EL mansori W.D.Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Arts et metiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne F-51006France Key Laboratory of metal High Performance Additive manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China Texas A&m Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843USA

In present work,a novel crack-free Al-Cu-mg-Si-Ti alloy with synchronous improved tensile properties and hot-cracking resistance was proposed and successfully manufactured by laser powder bed fusion(LPBF).The microstructure evolution behaviors and the corresponding strengthening mechanisms were investigated in *** LPBF-processed Al-Cu-mg-Si-Ti alloy presents a heterogeneous microstructure consisting of ultrafine equiaxed grains(UFGs)at the boundary and coarse columnar grains(CGs)at the center of the single molten ***-precipitated D022-Al 3 Ti particles were found to act as the nuclei to refine the grains at the boundary of the molten pool during solidification process,which is attributed to the low cooling rate providing the sufficient incubation time for the precipitation of D022-Al 3 *** are two orientation relationships(ORs)betweenα-Al and D022-Al 3 Ti,i.e.[001]α-Al//[001]D022-Al3Ti,(200)α-Al//(200)D022-Al3Ti and[1¯1¯2]α-Al//[¯111]D022-Al3Ti,(1¯11)α-Al//(¯11¯2)D022-Al3Ti,which are two of the eight ORs predicted with the E2Em *** grains in present alloy,no matter for UFGs or CG,exhibited high critical hot-cracking stress,which means a strong hot-cracking ***-nanoprecipitation of Cu-,mg-,and Si-rich Q’and S’phases was introduced to enhance the mechanical performance ofα-Al *** as-built sample exhibits superior tensile properties,with the yield strength(YS)of 473±8 mPa,ultimate tensile strength(UTS)of 541±2 mPa and elongation(EI)of 10.9%±1.2%.

关键词： Laser powder bed fusion High strength Al-Cu-mg alloys Duplex microstructure Precipitation Tensile properties

Effect of additives on nickel-phosphorus deposition obtained by electroless plating:Characterization and corrosion resistance in 3%(mass)sodium chloride medium

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Chinese Journal of Chemical Engineering 2022年第4期35卷 341-350页

作者： N.m'hanni T.Anik R.Touir m.Galai m.Ebn Touhami E.H.Rifi z.Asfari S.Bakkali Advanced materials and Process Engineering Laboratory Faculty of SciencesIbn Tofail UniversityBP 13314000 KenitraMorocco Regional Center for Education and Training Professions(CRmEF) KenitraMorocco Laboratory of molecular Engineering Applied to the Analysis IPHCUMR 7178 CNRSUniversity of StrasbourgECPM25 Street Becquerel67087 Strasbourg Cedex 2France Laboratoire de Chimie Analytique et moléculaire/LCAm UniversitéCadi AyyadFacultéPolydisciplinaireSidi BouzidB.P.416246000 SafiMorocco

Nichel-phosphorus(Ni-P)coatings are deposited on mild steel by using an electroless plating *** effect of three calix[4]arene derivatives,namely tetra methyl ester-P-tertbutyl calix[4]arene(Calix1),tetra acid-P-tert-butyl calix[4]arene(Calix2)and tetra methyl P-tert-butyl-thicalix[4]arene ester(Calix3)on the deposition rate,the deposit composition,and the morphological surface was investigated and the study of growth mechanisms has delivered useful information about the surface properties of *** is found that these additives modify the deposition rate and the nickel crystallization *** fact,the Calix1 and Calix3 act as an accelerator,while Calix2 acts as an inhibitor for the nickel ***,it is shown that the chemical bath is more stable with calix[4]arene derivatives addition and the obtained deposits are compact and *** is observed also that the nickel content increases with *** the other hand,the X-ray diffraction showed that the orientation peaks are intensified at{111}in the presence of Calix2,confirming obtained results of EDAX *** cyclic voltammetry revealed that the tested additives strongly influence the cathodic process and slightly affect the hypophosphite ***,it is found that these compounds improve the anticorrosion efficiency of Ni-P coating on the mild steel substrate in 3%(mass)NaCl,where its polarization resistance increases with Calix2 and Calix3 addition.

关键词： Electroless plating Ni-P coating Organic compounds Characterization Corrosion Reaction kinetics

On the microstructure and texture evolution in 17-4 PH stainless steel during laser powder bed fusion: Towards textural design

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Journal of materials Science & Technology 2022年第22期117卷 183-195页

作者： m.S.moyle N.Haghdadi X.z.Liao S.P.Ringer S.Primig School of materials Science&Engineering UNSW SydneyNSW 2052Australia Australian Centre for microscopy&microanalysis The University of SydneyNSW 2006Australia School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneyNSW 2006Australia

Additive manufacturing (Am) of metals allows the production of parts with complex designs, offeringadvanced properties if the evolution of the texture can be controlled. 17-4 precipitation hardening (PH)stainless steel is a high strength, high corrosion resistance alloy used in a range of industries suitable forAm, such as aerospace and marine. Despite 17-4 PH being one of the most common steels for Am, thereare still gaps in the understanding of its Am processing–structure relationships. These include the natureof the matrix phase, as well as the development of texture through Am builds under different processingconditions. We have investigated how changing the laser power and scanning strategy affects the microstructure of 17-4 PH during laser powder bed fusion. It is revealed that the matrix phase is δ-ferritewith a limited austenite presence, mainly in regions of the microstructure immediately below melt *** fraction is independent of the printing pattern and laser power. However, reducing the timebetween adjacent laser passes during printing results in an increase in the austenite volume *** effect of the higher laser power, as well as additional remelting within the printing strategy, isan increase in the average grain size by epitaxial ferrite grain growth across multiple build layers andthe development of a mosaic type microstructure. Changes to the scanning strategy have significant impacts on the textures observed along the build direction, while (100) texture along the scanning directionis observed consistently. mechanisms for texture formation and the mosaic structure are proposed thatpresents a pathway to the design of texture via Am process control.

关键词： Additive manufacturing 17-4 PH stainless steel microstructure Texture

Cu-assisted austenite reversion and enhanced TRIP effect in maraging stainless steels

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Journal of materials Science & Technology 2022年第9期104卷 52-58页

作者： m.C.Niu K.Yang J.H.Luan W.Wang z.B.Jiao School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advance materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of materials Science and Engineering City University of Hong KongHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenGuangdongChina

Control of the formation and stability of reverted austenite is critical in achieving a favorable combination of strength,ductility,and toughness in high-strength *** this work,the effects of Cu precipitation on the austenite reversion and mechanical properties of maraging stainless steels were investigated by atom probe tomography,transmission electron microscopy,and mechanical *** results indicate that Cu accelerates the austenite reversion kinetics in two manners:first,Cu,as an austenite stabilizer,increases the equilibrium austenite fraction and hence enhances the chemical driving force for the austenite formation,and second,Cu-rich nanoprecipitates promote the austenite reversion by serving as heterogeneous nucleation sites and providing Ni-enriched chemical conditions through interfacial *** addition,the Cu precipitation hardening compensates the strength drop induced by the formation of soft reverted *** tensile deformation,the metastable reverted austenite transforms to martensite,which substantially improves the ductility and toughness through a transformation-induced plasticity(TRIP)*** Cu-added maraging stainless steel exhibits a superior combination of a yield strength of~1.3 GPa,an elongation of~15%,and an impact toughness of~58 J.

关键词： maraging stainless steel TRIP effect Austenite reversion Cu-rich nanoprecipitate

Elemental profile of black shales

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Chinese Journal Of Geochemistry 2011年第2期30卷 217-219页

作者： KASHIF Naeem WASIm Yawar TARIQ m.bhatti BASHIR mohammad Central Analytical Facility Division Pakistan Institute of Nuclear Science and TechnologyP.O.NiloreIslamabad 45650Pakistan Pakistan Institute of Engineering and Applied Sciences P.O.NiloreIslamabad 45650Pakistan

A black shale sample collected from the Chimiari site(Tarbela) was analyzed for elemental *** coupled plasma-optical emission spectrometry(ICP-OES) was employed to determine major and trace elements in the *** analysis was accomplished for the black shales,which was better than 2.0%.Result shows that the shales are very rich in Ca(25439 μg·g-1),Fe(13933 μg·g-1),Ti(6932 μg·g-1),Al(5993 μg·g-1) and K(2730 μg·g-1).

关键词：黑页岩 ICP-OES 踪迹元素

Effect of Organic manure and Chemical Amendments on Soil Properties and Crop Yield on a Salt Affected Entisol

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Pedosphere 2005年第1期15卷 46-51页

作者： A.U.bhatti Q.KHAN A.H.GURmANI m.J.KHAN DepartmentofSoilandEnvironmentalSciences NWFPAgriculturalUniversityPeshawarPakistan AridzoneResearchInstitute DeralsmailKhanNWFPPakistan

A field experiment was conducted for two consecutive years in a farmer's field at Haji mora Village, Dera Ismail Khan(D.I. Khan) in the Northwest Frontier Province (NWFP) of Pakistan to compare various management practices, such as the effect of various organic manures and gypsum in a rice-wheat cropping system on a saline-sodic Entisol (zindani soil series). The treatments consisted of 1) a control (rice-wheat), 2) gypsum, 3) farmyard manure (FYm), 4) berseem(Trifolium alexandrinum L.) as green manure (Gm), and 5) dhancha (Sesbania sp.) as Gm. All treatments increased yields of both rice and wheat significantly (P ＜ 0.01) over the control, with the green manure treatments proving more economical than the others; while they decreased pH, electrical conductivity (EC), and sodium adsorption ratio (SAR) of the soil. Saturation percentage and available water of the soil were raised for all treatments due to an increase in organic matter content of the soil.

关键词：埃及车轴草土壤性质盐碱土农作物生长有机肥料

钆苯二胺增强mRI定量信息可以预测孤立性肝细胞癌增殖亚型：一项多中心回顾性研究

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国际医学放射学杂志 2024年第3期 379-379页

作者： F.Ding m.Huang P.Ren J.zhang z.Lin Y.Sun 孔令红

摘要目的研究钆苯二胺增强mRI定量参数在预测肝细胞癌（HCC）分子亚型及总生存期方面的价值。方法该项多中心回顾性研究纳入218例完成钆苯二胺增强mRI检查

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