MRS Proceedings最新文献_第7页

Synthesis of Nano/Meso-Structured Silicon Films by Plasma Deposition 等离子沉积法制备纳米/介观结构硅薄膜

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.51

William W. Hernández-Montero, C. Zuñiga-Islas, F. J. D. L. Hidalga-Wade, W. Calleja-Arriaga, A. Itzmoyotl-Toxqui

引用次数: 0

Study of a modified ECAP die for producing nanostructured Al6060 alloy using 3D finite element simulation 基于三维有限元模拟的纳米Al6060合金改进ECAP模具研究

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.80

M. A. González-Lozano, Patricia Ponce-Peña, M. Escobedo-Bretado, R. Lara-Castro, B. X. Ochoa-Salazar

引用次数: 0

A Non-Planar Iodinated Pyrrole Study 非平面碘化吡咯的研究

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.78

E. A. Valenzuela-Hermosillo, J. Pacheco-Sánchez

引用次数: 0

Design and Characterization of a Magnetorheological Damper for Vibration Mitigation during Milling of Thin Components 薄型零件铣削减振磁流变阻尼器的设计与特性研究

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.19

S. Puma-Araujo, D. Olvera-Trejo, A. Elías-Zúñiga, O. Martínez-Romero, C. Rodríguez

{"title":"Design and Characterization of a Magnetorheological Damper for Vibration Mitigation during Milling of Thin Components","authors":"S. Puma-Araujo, D. Olvera-Trejo, A. Elías-Zúñiga, O. Martínez-Romero, C. Rodríguez","doi":"10.1557/OPL.2016.19","DOIUrl":"https://doi.org/10.1557/OPL.2016.19","url":null,"abstract":"The aerospace and automotive industries demand the development of new manufacturing processes. The productivity during machining of very flexible aerospace and automotive aluminum components is limited for self-excited vibrations. New solutions are needed to suppress vibrations that affect the accuracy and quality of the machined surfaces. Rejection of one piece implies an increase in the manufacturing cost and time. This paper is focused on the design, manufacturing and characterization of a magnetorheological damper. The damper was attached to a thin-floored component and a magnetic field was controlled in order to modify the damping behavior of the system. The dynamics of the machining process was developed by considering a three-degree-of-freedom model. This study was experimentally validated with a bull-nose end milling tool to manufacture monolithic parts with thin wall and thin floor. Experimental tests and characterization of the magnetorheological damper permitted to improve the surface finish and productivity during the machining of thin-floored components. A further aim of this paper was to develop a rheological damper by using magnetorheological fluids (MR) to change the thin floor rigidity with voltage. The stability of the milling process was also analytically described considering one, two or three degrees of freedom, using a mathematical integration model based on the Enhanced Multistage Homotopy Perturbation Method (EMHPM).","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"65 1","pages":"65-70"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81461370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Porous Silicon Nanostructured Materials for Sensing Applications: Molecular Assembling and Electrochemical or Optical Evaluation 传感应用的多孔硅纳米结构材料:分子组装和电化学或光学评价

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.21

J. Márquez, M. Cruz-Guzmán, L. Cházaro, G. Palestino

{"title":"Porous Silicon Nanostructured Materials for Sensing Applications: Molecular Assembling and Electrochemical or Optical Evaluation","authors":"J. Márquez, M. Cruz-Guzmán, L. Cházaro, G. Palestino","doi":"10.1557/OPL.2016.21","DOIUrl":"https://doi.org/10.1557/OPL.2016.21","url":null,"abstract":"Porous silicon (PSi) combines the potential of miniaturization with a very large surface area. The PSi surface can be chemically modified resulting in a high sensitivity (low detection threshold) device for chemical and biomolecular sensing. In previous work, we have shown that redox proteins and fluorescent ligands can be infiltrated into PSi (PSiMc) structures. The hybrid devices have shown interesting new properties produced by the coupling of the individual properties of PSi nanostructures and the modifiers. In this work, we have obtained a PSiMc/redox protein bioelectrode, which presents a quasi-reversible electrochemical response. This effect was attributed to the semiconducting nature of the PSi substrate and to the functional groups of the crosslinking molecules (MPTS), which together produce a capacitive effect on the device. On the other hand, the chemical modification of PSiMc with fluorescent ligands allowed us to fabricate fluorescent PSi hybrid nanostructures, which were tested for the detection of environmental pollutants such as heavy metals (specifically Hg2+). We found that the selectivity of this optical device depends on the selected recognizing molecule. The captured metal induces the formation of a metallic complex that shows higher fluorescence compared with the sensor device. These results demonstrate the viability of using porous silicon as optical sensors and electrochemical biosensors. The infiltration of fluorescent recognizing molecules and proteins into the PSi matrix were evaluated by specular reflectance, FTIR spectroscopy, fluorescence spectroscopy and cyclic voltammetry.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"96 1","pages":"77-82"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80819303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Ti Microaddition on Cavitation Behavior During Uniaxial Hot-Tensile of Fe-22Mn-1.5Al-1.3Si-0.5C Austenitic TWIP Steel Ti微添加对Fe-22Mn-1.5Al-1.3Si-0.5C奥氏体TWIP钢单轴热拉伸空化行为的影响

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.28

A. E. Salas-Reyes, I. Mejía, J. Cabrera

引用次数: 1

Deposition and Photocatalytic Activity of Ag:V2O5 Thin Films Ag:V2O5薄膜的沉积及其光催化活性

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.49

F. González-Zavala, L. Escobar-Alarcón, D. Solís-Casados, D. Rebollar, R. Basurto, E. Haro‐Poniatowski

引用次数: 1

Ab Initio Study of Weldability of a High-Manganese Austenitic Twinning-Induced Plasticity (TWIP) Steel Microalloyed with Boron 微合金化硼高锰奥氏体孪晶塑性(TWIP)钢可焊性的从头计算研究

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.15

H. Hernández-Belmontes, I. Mejía, C. Maldonado

{"title":"Ab Initio Study of Weldability of a High-Manganese Austenitic Twinning-Induced Plasticity (TWIP) Steel Microalloyed with Boron","authors":"H. Hernández-Belmontes, I. Mejía, C. Maldonado","doi":"10.1557/OPL.2016.15","DOIUrl":"https://doi.org/10.1557/OPL.2016.15","url":null,"abstract":"High-Mn Twinning-Induced Plasticity (TWIP) steels are advanced high-strength steels (AHSS) currently under development; they are fully austenitic and characterized by twinning as the predominant strengthening mechanism. TWIP steels have high strength and formability with an elongation up to 80%, which allows reduction in automotive components weight and fuel consumption. Since the targeted application field of TWIP steels is the automotive industry, steels need high mechanical performance with good weldability and excellent corrosion resistance. However, there is lack of information about the weldability behavior of these advanced steels. This research work aims to study the weldability of a new generation of high-Mn austenitic TWIP steels microalloyed with B. Weldability was examined using spot welds produced by Gas Tungsten Arc Welding. Microstructural changes were examined using light optical metallography. Segregation of elements in the weld joint was evaluated using point and elemental mapping chemical analysis by Scanning Electron Microscopy and Electron-Dispersive Spectroscopy; while the hardness properties were examined with Vickers microhardness testing (HV25). Experimental results show that the welded joint microstructure consists of austenitic dendritic grains in the fusion zone, and equiaxed grains in the heat affected zone. Notably, the boron microalloyed TWIP steel exhibited poor weldability, showing hot cracking. Additionally, the studied TWIP steels showed a high degree of segregation in the fusion zone; Mn and Si segregated into the interdendritic regions, while Al and C preferentially segregated in dendritic areas. Finally, the welded joints of the TWIP steels showed microhardness values lower than the base material. In general, the present TWIP steels have problems of weldability, which are corroborated with microstructural changes, elements segregation and microhardness loss.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"5 1","pages":"35-40"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91378052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Structural, hardness and tribological behavior of TiAlNO coatings prepared by sputtering 溅射制备TiAlNO涂层的结构、硬度和摩擦学性能

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.52

L. G. Gonzalez, S. R. V. García, L. Z. Peredo, A. L. Velázquez, L. D. Lvova, N. Ramírez, M. G. Romo, T. Quiroz, J. H. Torres

引用次数: 0

PWR Fuel Element Neutronic Analysis with Burnable Poison Rods Using Zircaloy and Hi-Nicalon Type S Claddings 采用锆合金和高镍合金S型包覆层的压水堆燃料元件中子分析

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/opl.2016.31

R. B. D. Faria, Javier González Mantecón, A. R. Hamers, A. L. Costa, Â. Fortini, C. Pereira

引用次数: 0