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Microstructures and mechanical properties of nanocrystalline NiTi intermetallics formed by mechanosynthesis

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 80-87页

作者： S.Arunkumar P.Kumaravel C.velmurugan v.senthilkumar vinayaka Mission's Kimpananda variyar Engineering College Salem 636308TamilnaduIndia Institute of Road and Transport Technology Erode 638316TamilnaduIndia National Institute of Technology Trichy 620015TamilnaduIndia

The formulation of nanocrystallinc NiTi shape memory alloys has potential effects in mechanical stimulation and medical im- plantology. The present work elucidates the effect of milling time on the product＇s structural characteristics, chemical composition, and mi- crohardness for NiTi synthesized by mechanical alloying for different milling durations. Increasing the milling duration led to the formation of a nanocrystalline NiTi intermetallic at a higher level. The formation of nanocrystalline materials was directed through cold fusion, fractur- ing, and the development of a steady state, which were influenced by the accumulation of strain energy. In the morphological study, uninter- rupted cold diffusion and fracturing were visualized using transmission electron microscopy. Particle size analysis revealed that the mean particle size was reduced to -93 μm after 20 h of milling. The mechanical strength was enhanced by the formation of a nanocrystalline in- termetallic phase at longer milling time, which was confirmed by the results of vickers hardness analyses.

关键词： nickel-titanium shape memory alloy lattice strain nano-crystalline mechanical alloying microstructural characterization

Efect of varying Dzyaloshinskii–Moriya Interaction on the Bistable Nano-Scale Soliton Switching

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Communications in Theoretical Physics 2013年第12期60卷 658-662页

作者： L.Kavitha M.Saravanan v.senthilkumar D.Gopi Department of Physics Periyar University The Abdus Salam International Centre for Theoretical Physics Center for Nanoscience and Nanotechnology Periyar University Department of Chemistry Periyar University

The efect of Dzyaloshinskii–Moriya(D-M) interaction on the bistable nano-scale soliton switching ofers the possiblity of developing a new innovative approach for data storage technology. The dynamics of Heisenberg ferromagnetic spin system is expressed in terms of generalized inhomogeneous higher order nonlinear Schro¨dinger(NLS) equation. The bistable soliton switching in the ferromagnetic medium is established by solving the associated coupled evolution equations for amplitude and velocity of the soliton using the fourth order Runge–Kutta method numerically.

关键词：双稳态孤子相互作用开关纳米级耦合方程组数据存储技术铁磁介质高阶非线性

应用本构模型和神经网络模型预测铝/镁基纳米复合材料的高温流变行为(英文)

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中国有色金属学会会刊：英文版 2013年第6期23卷 1737-1750页

作者： v.senthilkumar A.BALAJI D.ARULKIRUBAKARAN Department of Production Engineering National Institute of Technology

为了预测Al/Mg基纳米复合材料的高温流变行为,在不同的应变速率(0.01-1.0s-)和温度(523,623和1723K)的条件下进行热压缩试验,利用所得到的应力-应变数据,开发了本构模型,比如一般流动方程。阿累尼乌斯双曲模型、Johnson-Cook(JC)和改性... 详细信息

为了预测Al/Mg基纳米复合材料的高温流变行为,在不同的应变速率(0.01-1.0s-)和温度(523,623和1723K)的条件下进行热压缩试验,利用所得到的应力-应变数据,开发了本构模型,比如一般流动方程。阿累尼乌斯双曲模型、Johnson-Cook(JC)和改性的Zerilli-Armstrong(ZA)模型及人工神经网络(ANN)模型。通过使用统计参数,例如均方根误差(RMSE)、回归系数(R2)、平均相对误差(MRE)和分散指数(Is),比较了人工神经网络和不同的本构模型。结果表明,人工神经网络模型对AA5083-2%TiC复合材料的热变形流动应力的评估准确性更高。

关键词：热压缩 Johnson-Cook(JC)模型改性Zerilli-Armstrong(ZA)模型阿累尼乌斯(AR)双曲模型流动应力纳米复合材料

Effect of temperature and strain rate on compressive response of extruded magnesium nano-composite

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Journal of Magnesium and Alloys 2015年第3期3卷 224-230页

作者： B.Selvam P.Marimuthu R.Narayanasamy v.senthilkumar K.S.Tun M.Gupta Department of Mechanical Engineering Mookambigai College of EngineeringPudukkottaiTamilnadu 622502India Syed Ammal Engineering College RamanathapuramTamilnadu 623502India Department of Production Engineering National Institute of TechnologyTiruchirappalliTamilnadu 620015India Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore

The hot deformation behaviour of extruded magnesium-zinc oxide nano composite has been studied using hot compression test.The test was conducted in the temperature range of 250-400℃ and in the strain rate range of 0.01 to 1.5 s^(−1).The processing map was obtained using the power dissipation efficiency with the functions of temperature and strain rate.The workability and instability domains were observed in the processing map for a nano composite.The optical microscopy(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)images were used to confirm the formation of dynamic recrystallization(DRX),dynamic recovery(DRY)and instability regions.The workability region of the composite was identified at a working temperature of 400℃ and the strain rate of 0.01 s^(−1) from the processing map.The instability regions were observed at higher strain rates(>0.1 s^(−1))and temperatures(250-400℃).

关键词： Metal matrix composites Powder metallurgy Processing map Strain rate Instability Nano-composite

热循环对锅炉管热喷涂Ni-Cr基纳米涂层的影响（英文）

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Transactions of Nonferrous Metals Society of China 2015年第5期25卷 1533-1542页

作者： v.senthilkumar B.THIYAGARAJAN M.DURAISELvAM K.KARTHICK Department of Production Engineering National Institute of Technology Bharat Heavy Electricals Limited

采用机械球磨法制备Ni-Cr基纳米原料粉末。粉末颗粒在行星球磨机中反复经历焊合、碎裂和重焊合过程。采用超音速火焰喷涂工艺(HvOF)在碳钢管上喷涂球磨纳米粉末。利用金相显微镜、XRD、扫描电子显微镜(SEM),高分辨透射电子显微镜(HR-TEM... 详细信息

采用机械球磨法制备Ni-Cr基纳米原料粉末。粉末颗粒在行星球磨机中反复经历焊合、碎裂和重焊合过程。采用超音速火焰喷涂工艺(HvOF)在碳钢管上喷涂球磨纳米粉末。利用金相显微镜、XRD、扫描电子显微镜(SEM),高分辨透射电子显微镜(HR-TEM)、能谱(EDS)和显微硬度测试对原料粉和HvOF喷涂涂层进行表征。对喷涂和未喷涂试样进行热循环分析,研究相、冶金性能和显微硬度的变化。与传统喷涂试样相比,Ni-Cr纳米涂层试样具有更高的力学和冶金性能。与传统涂层相比,纳米涂层的显微组织更均匀和紧密。

关键词：纳米结构涂层原料粉热喷涂锅炉管超音速火焰喷涂

Direct vapor phase growth process and robust photoluminescence properties of large area MoS2 layers

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Nano Research 2014年第12期7卷 1759-1768页

作者： v. senthilkumar Le C. Tam Yong Soo Kim Yumin Sim Maeng-Je Seong Joon. I. Jang Department of Physics and Energy Harvest Storage Research Center (EHSRC) University ofUIsan Ulsan 680-749 South Korea Department of Physics Applied Physics and Astronomy Binghamton University New York 13902 USA Department of Physics Chung-Ang University Seoul 156-756 South Korea

在那里在收获设备的光电子和精力的领域里在铝二硫化物的使用一直在种研究兴趣，由它的 indirect-to-direct 乐队差距 tunability 的优点。然而，获得大区域瞬间的薄电影为未来设备应用的 2 仍然是挑战。在现在的学习，先锋的数量(S... 详细信息

在那里在收获设备的光电子和精力的领域里在铝二硫化物的使用一直在种研究兴趣，由它的 indirect-to-direct 乐队差距 tunability 的优点。然而，获得大区域瞬间的薄电影为未来设备应用的 2 仍然是挑战。在现在的学习，先锋的数量(S 和哞 3 ) 系统地被改变以便优化高度水晶、大的区域瞬间的生长由化学蒸汽免职方法的 2 层。先锋的数量的小心的控制在大区域的合成被发现到关键因素高度水晶的薄片。层的厚度被拉曼光谱学和原子力量显微镜学证实。光性质和化学作文被光致发光(PL ) 和 X 光检查光电子光谱学学习。在 1.82 ev 的强壮的直接激子的排出物的出现(A 激子，与 55 个 thout 事件的规范的 PL 紧张[1.84 ??? 隰酐鱠? 鎄颩 ???? 頿?? 鲰？？

关键词：化学气相沉积法光致发光性质 MoS2 生长过程面积 X射线光电子能谱过渡金属硫化物光电子能量

Synthesis and Characterization of Ultrafine Grained 304 Stainless Steel through Machining

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Journal of Minerals and Materials Characterization and Engineering 2011年第5期10卷 455-461页

作者： v. senthilkumar K. Lenin Department of Mechanical Engineering Jayaram College of Engineering and TechnologyTrichy India Department of Production Engineering National Institute of Technology Trichy India

The microstructures of 304 stainless steel chips created by plane strain machining at ambient temperature have been analyzed using scanning electron microscopy (SEM) and the crystallite size of the ultrafine chips were analyzed using X-Ray Diffraction Analysis. The strain imposed in the chips was varied by changing the tool rake angle. An attempt is made in the present investigation to correlate the plastic strain, strain rate with the grain size of the stainless steel.

关键词： Plane strain machining Nanocrystalline strain rate.

Effect of Secondary Processing and Nanoscale Reinforcement on the Mechanical Properties of Al-TiC Composites

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Journal of Minerals and Materials Characterization and Engineering 2011年第14期10卷 1293-1306页

作者： v. senthilkumar A. Balaji Hafeez Ahamed Department of Production Engineering National Institute of TechnologyTiruchirrappalli – 620015 India

Aluminium based composites containing 1, 1.5 and 2wt. % of nano-sized Titanium Carbide particulates (TiC), with an average of 45nm, reinforcement were synthesized using low energy planetary ball mill followed by hot extrusion. Microstructural characterization of the materials revealed uniform distribution of reinforcement, grain refinement and the presence of minimal porosity. Properties characterization revealed that the presence of nano-TiC particulates led to an increase in hardness, elastic modulus, 0.2% yield strength (0.2% offset on a stress-strain curve), and the stress at which a material exhibits a specified permanent deformation, Ultimate Tensile Strength (UTS) and ductility of pure aluminum. Fractography studies revealed that the fracture of pure aluminum occurred in ductile mode due to the incorporation and uniform distribution of nano-TiC particulates. An attempt is made in the present study to correlate the effect of nano-sized TiC particulates as reinforcement and processing type with the micro structural and tensile properties of aluminum composites. The mechanical properties, namely, the UTS, hardness, grain size and distribution of the reinforcement in the base metal were studied in as sintered and extruded conditions. Orowan strengthening criteria was used to predict the yield strength of Al-TiC composites in the present work and experimental results were compared with the theoretical results.

关键词： Nano-particulates Aluminum Tensile properties Microstructure Ductility Orowanstrengthening

Deep Learning Enabled Social Media Recommendation Based on User Comments

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Computer Systems Science & Engineering 2023年第2期44卷 1691-1702页

作者： K.Saraswathi v.Mohanraj Y.Suresh J.senthilkumar Department of Computer Science and Engineering Government College of EngineeringSalem636011India Department of Information Technology Sona College of TechnologySalem636005India

Nowadays,review systems have been developed with social media Recommendation systems(RS).Although research on RS social media is increas-ing year by year,the comprehensive literature review and classiﬁcation of this RS research is limited and needs to be improved.The previous method did notﬁnd any user reviews within a time,so it gets poor accuracy and doesn’tﬁlter the irre-levant comments efﬁciently.The Recursive Neural Network-based Trust Recom-mender System(RNN-TRS)is proposed to overcome this method’s problem.So it is efﬁcient to analyse the trust comment and remove the irrelevant sentence appropriately.Theﬁrst step is to collect the data based on the transactional reviews of social media.The second step is pre-processing using Imbalanced Col-laborative Filtering(ICF)to remove the null values from the dataset.Extract the features from the pre-processing step using the Maximum Support Grade Scale(MSGS)to extract the maximum number of scaling features in the dataset and grade the weights(length,count,etc.).In the Extracting features for Training and testing method before that in the feature weights evaluating the softmax acti-vation function for calculating the average weights of the features.Finally,In the classiﬁcation method,the Recursive Neural Network-based Trust Recommender System(RNN-TRS)for User reviews based on the Positive and negative scores is analysed by the system.The simulation results improve the predicting accuracy and reduce time complexity better than previous methods.

关键词： Recommendation systems(RS) social media recursive neural network-based trust recommender system(RNN-TRS) user reviews