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Journal of Materials Science & technology 2022年第27期122卷 68-76页

作者： J.Christudasjustus C.S.Witharamage Ganesh Walunj t.borkar R.K.Gupta Department of Materials Science and Engineering North Carolina State UniversityRaleighNC 27606United States Department of Mechanical Engineering Cleveland State UniversityClevelandOH 44115United States

Al-xV alloys(x=2 at.%,5 at.%,10 at.%)with nanocrystalline structure and high solid solubility of V were produced in powder form by high-energy ball milling(HEBM).the alloy powders were consolidated by spark plasma sintering(SPS)employing a wide range of temperatures ranging from 200 to 400°*** microstructure and solid solubility of V in Al were investigated using X-ray diffraction analysis,scanning electron microscope and transmission electron *** microstructure was influenced by the SPS temperature and V content of the *** alloys exhibited high solid solubility of V–six orders of magnitude higher than that in equilibrium state and grain sizet all the SPS *** formation of Al3V intermetallic was detected at 400℃.Formation of a V-lean phase and bimodal grain size was observed during SPS,which increased with the increase in SPS *** hardness and elastic modulus,measured using nanoindentation,were significantly higher than commercial *** example,Al-V alloy produced by SPS at 200℃ exhibited a hardness of 5.21 GPa along with elastic modulus of 96.21 *** evolution of the microstructure and hardness with SPS temperatures has been discussed.

关键词： Spark plasma sintering Aluminum alloys Nanocrystalline alloys High-energy ball milling Nanoindentation Hardness Elastic modulus

Spark plasma sintering of a high-energy ball milled Mg-10 wt% Al alloy

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Journal of Magnesium and Alloys 2020年第2期8卷 319-328页

作者： M.U.F.Khan A.Patil J.Christudasjustus t.borkar R.K.Gupta Department of Chemical Biomolecularand Corrosion EngineeringThe University of AkronAkronOH 44325United States Department of Mechanical Engineering Washkevicz College of EngineeringCleveland State UniversityClevelandOH 44115United States

the influence of spark plasma sintering(SPS)temperature on microstructure,hardness and corrosion behavior of a high-energy ball milled Mg-10wt%Al alloy was investigated in this *** holding time and sintering pressure for SPS were kept constant while varying the sintering temperature from 200 to 350℃.the grain size and microstructure were studied using X-ray diffraction analysis,scanning electron microscopy,energy dispersive X-ray spectroscopy,and Archimedes'based density *** behavior was investigated using potentiodynamic polarization *** nanocrystalline regime(grain sizetained even after SPS up to 350℃.the density of the alloy increased with increasing the SPS ***'hardness and corrosion performance improved up to 300℃ followed by a decrease after SPS at 350℃.Possible reasons for densification,strengthening,and corrosion behavior have been discussed in the light of reduced porosity and microstructural changes.

关键词： Nanocrystalline alloy Magnesium High energy ball milling Spark plasma sintering Corrosion

Bianchi type-I Massive String Magnetized Barotropic Perfect Fluid Cosmological Model in the Bimetric theory of Gravitation

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Chinese Physics Letters 2011年第8期28卷 368-371页

作者： N.P.Gaikwad M.S.borkar S.S.Charjan Department of Mathematics Dharampeth M.P.Deo Memorial Science CollegeNagpur 440033India Post Graduate Department of Mathematics Mahatma Jyotiba Phule Educational CampusAmravati RoadR.T.M.Nagpur UniversityNagpur 440033India Department of Mathematics Late K.Z.S.Science CollegeBramhniKalmeshwar 441501 Dist.NagpurIndia

We investigate the Bianchi type-I massive string magnetized barotropic perfect fluid cosmological model in Rosen's bimetric theory of gravitation with and without a magnetic field by applying the techniques used by Latelier(1979,1980)and Stachel(1983).to obtain a deterministic model of the universe,it is assumed that the universe is filled with barotropic perfect fluid *** physical and geometrical significance of the model are *** comparing our model with the model of Bali et al.(2007),it is realized that there are no big-bang and big-crunch singularities in our model and t=0 is not the time of the big bang,whereas the model of Bali et *** with a big bang at t=***,our model is in agreement with Bali et al.(2007)as time increases in the presence,as well as in the absence,of a magnetic field.

关键词： universe massive Perfect

环锭纺、转杯纺和喷气纺纱线对针织物手感的影响研究

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纺织导报 2017年第4期 61-65页

作者： Nitin.t.Patil S.P.borkar Stephan Weidner-Bohnenberger Marc Schnell veermata jijabai technological institute(vjti) mumbai rieter machine works ltd.

现在工业化的纺纱方式为环锭纺、转杯纺和喷气纺。每种纺纱技术都有其典型的纱线结构,纱线结构决定了纱线的特性及下游和最终纺织品的特性。具有更好手感的面料无疑采用精梳环锭纺纱线。为了生产柔软转杯纱,捻度设置要低,并且在织物整... 详细信息

现在工业化的纺纱方式为环锭纺、转杯纺和喷气纺。每种纺纱技术都有其典型的纱线结构,纱线结构决定了纱线的特性及下游和最终纺织品的特性。具有更好手感的面料无疑采用精梳环锭纺纱线。为了生产柔软转杯纱,捻度设置要低,并且在织物整理过程中需要采取一定的辅助措施。通过采用新一代纺纱箱和纺纱组件,转杯纺具有很大的潜力来减小捻度,这也是针织物获得柔软手感的基本先决条件。喷气纺正从100%粘胶纱向新的应用领域针织用混纺棉纱和100%精梳纱发展。这都是对传统环锭纺纱线柔软性的挑战。本研究针对转杯纺和喷气纺织物采用不同方法去实现与环锭纺纱织物相当手感的织物。该项研究在转杯纺和喷气纺高产低成本方面也有一定价值。

关键词：环锭纺转杯纺喷气纺纱线结构手感

Experimental verification of the ab initio phase transition sequence in SrZrO_(3) and comparisons with SrHfO_(3) and SrSnO_(3)

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npj Computational Materials 2017年第1期3卷 464-469页

作者： Ashok Kumar Shalini Kumari Hitesh borkar Ram S Katiyar James Floyd Scott CSIR-National Physical Laboratory Dr.K.S.Krishnan MargNew Delhi 110012India Academy of Scientific and Innovative Research(AcSIR) CSIR-National Physical Laboratory(CSIR-NPL)CampusDr.K.S.Krishnan MargNew Delhi 110012India Department of Physics and Institute for Functional Nanomaterials University of Puerto RicoSan JuanPR 00931-3334USA Department of Chemistry and Department of Physics University of St AndrewsSt AndrewsScotland KY16 STUK

We present detailed Raman studies of SrZrO_(3)(SZO)that show three anomalies in Raman modes:One has a small jump in frequencyω,one has its intensity vanish,and a third has a sharp change in temperature derivative dω(t)/dt from flat below t=600 K to a Curie-Weiss dependence above 600 K with extrapolation to zero frequency at the known transition temperature t=970 K,thereby proving the latter to be *** addition,the P4mm ferroelectric phase predicted at high stresses has preliminary support from polarization-voltage *** inference of a new transition in the temperature region 600-650 K is in disagreement with neutron *** are given for family member SrSnO_(3) and SrHfO_(3),and we discuss the different conclusions of Kennedy and *** show that a known transition in SrHfO_(3) is also displacive with a well-behaved soft mode.

关键词： transition phase thereby

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环锭纱、转杯纱和喷气纱对针织物手感的影响

国际纺织导报 2017年第9期45卷 8-12,21页

作者： N.t.Patil S.P.borkar S.Weidner-Bohnenberger M.Schnell VeermataJijabai技术研究所(VJtI)(印度) 立达机械公司(瑞士)

环锭纺、转杯纺和喷气纺技术目前已广泛用于纱线的商业化生产,每种纺纱技术都可赋予纱线特定的结构,这些纱线结构决定了纱线的特性,以及后续工序和下游纺织产品的性能。采用精梳环锭纱制成的织物无疑具有最佳的手感。为生产柔软的转杯纱... 详细信息

环锭纺、转杯纺和喷气纺技术目前已广泛用于纱线的商业化生产,每种纺纱技术都可赋予纱线特定的结构,这些纱线结构决定了纱线的特性,以及后续工序和下游纺织产品的性能。采用精梳环锭纱制成的织物无疑具有最佳的手感。为生产柔软的转杯纱,纱线的捻系数宜偏小设定,并在纺织品后整理阶段采取相应的措施。转杯纺纱在降低纱线捻系数方面具有较大潜力,其采用一种新型转杯及相应的配件生产低捻度纱线,是制备手感柔软的针织物的前提。目前喷气纺系统已由生产纯黏胶纱拓展至生产棉混纺纱,以及用于针织的纯棉精梳纱等新的应用领域,产品的柔软性可与普通环锭纱相媲美。对比评价了采用不同整理方法的转杯纺和喷气纺织物与环锭纺织物在不同产品阶段的织物手感风格。评价结果有助于发掘转杯纺和喷气纺的潜力以满足高速度和低转换成本的生产需求。

关键词：针织物手感主观评价客观评价环锭纱转杯纱喷气纱