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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Magneto-oscillatory exchange coupling in magnetic multilayers with Cr←1←-←xV←x and Cr←1←-←xMo←x spacers : the correlation of extremal fermi surface vectors with oscillation periods

Hughes, Robert James January 2000 (has links)
No description available.
12

Microstructural and superconducting properties of V doped MgB2 bulk and wires

Castillo, Oscar Eduardo. Schwartz, Justin, January 2004 (has links)
Thesis (M.S.)--Florida State University, 2004. / Advisor: Dr. Justin Schwartz, Florida State University, College of Engineering, Dept. of Mechanical Engineering. Title and description from dissertation home page (viewed June 17, 2004). Includes bibliographical references.
13

Role of synergy between wear and corrosion in degradation of materials

Azzi, Marwan. January 2008 (has links)
Tribocorrosion is a term used to describe the material degradation due to the combination of electrochemical and tribological processes. Due to a synergetic effect, the material loss can be larger than the sum of the losses due to wear and corrosion acting separately. In this thesis, the synergy of wear and corrosion was investigated for different types of material, namely the Ti-6Al-4V alloy, the SS316L stainless steel coated with a thin film of Diamond Like Carbon (DLC), and the SS301 stainless steel coated with a thin film of chromium silicon nitride (CrSiN). / A tribocorrosion apparatus was designed and constructed to conduct wear experiments in corrosive media. Sliding ball-on-plate configuration was used in this design, where the contact between the ball and the specimen is totally immersed in the test electrolyte. The specimen was connected to a potentiostat to control its electrochemical parameters, namely the potential and the current. Electrochemical techniques were used to control the kinetics of corrosion reactions, and therefore it was possible to assess separately the role of corrosion and wear in the total degradation of material, and to evaluate the synergy between them. / For Ti-6Al-4V, it was found that the corrosion and tribocorrosion depend strongly on the structure of the material. The alpha-equiaxed microstructure with fine dispersed beta-phase exhibited the best corrosion resistance. The corrosion resistance was found to decrease when the basal plane was preferentially aligned parallel to the surface, which is attributed to a low resistance to charge transfer in the oxide films formed on this plane. On the other hand, when wear and corrosion were involved simultaneously, the oxide layer protecting the substrate against dissolution was mechanically destroyed leading to a high corrosion rate. It was found that the hardness was the most important factor determining the tribocorrosion behavior of the Ti-6Al-4V alloy; samples with high hardness exhibited less mechanical wear, less wear-enhanced corrosion, and less corrosion-enhanced wear. / For DLC coatings, it was found that interface engineering plays a crucial role in the tribocorrosion behavior of DLC films. DLC films with nitrided interface layer (SS\N3h\DLC) were shown to have very poor tribocorrosion resistance; the DLC film delaminated from the substrate after 50 cycles of sliding wear at 9 N load in Ringer's solution. It should be mentioned that a previous study performed at Ecole Polytechnique de Montreal [4] has shown that the same coating resisted 1800 cycles of dry wear at 22 N without delamination. This demonstrates clearly the effect of corrosion on the wear resistance of DLC films. The use of a-SiN:H bond layer between the SS316L substrate and the DLC film improved significantly the tribocorrosion behavior of the coating. This layer acts as a barrier against corrosion reaction; the polarization resistance was 5.76 GO.cm2 compared to 27.5 MO.cm2 and 1.81 MO.cm2 for the DLC-coated SS316L with nitrided interface layer and the bare substrate, respectively. / For CrSiN coatings, it was also shown that nitriding treatment of the substrate prior to deposition reduces significantly the tribocorosion resistance of the CrSiN-coated SS301 substrates. This is attributed to the peculiar morphology of the nitrided surface prior to deposition. The high relives at the grain boundaries of the substrate may be the reason for the generation, during sliding wear, of defects in the film, which makes the infiltration of the liquid easier, and consequently leads to the destruction of the CrSiN film.
14

Strain accumulation and shakedown in fatigue of Ti-6A1-4V by Ryan J Morrissey

Morrissey, Ryan J. 08 1900 (has links)
No description available.
15

Crystal plasticity modeling of Ti-6Al-4V and its application in cyclic and fretting fatigue analysis

Zhang, Ming. January 2008 (has links)
Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008. / Committee Chair: David. L. McDowell; Committee Member: Min Zhou; Committee Member: Naresh N. Thadhani; Committee Member: Rami M. Haj-Ali; Committee Member: Richard W. Neu.
16

Analysis and characterization of the metabolic and morphologic responses to uniaxial deformation of osteoblasts cultured on Ti-6Al-4V

Rigsby, Deborah F. January 1998 (has links)
Thesis (Ph. D.)--University of Alabama at Birmingham, 1998. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
17

Analysis and characterization of the metabolic and morphologic responses to uniaxial deformation of osteoblasts cultured on Ti-6Al-4V

Rigsby, Deborah F. January 1998 (has links)
Thesis (Ph. D.)--University of Alabama at Birmingham, 1998. / Includes bibliographical references.
18

Additive layer manufacturing of TI-6AL-4V by electron beam melting from powder particles solid, mesh and foam components study /

Gaytan Guillen, Sara Marisela, January 2009 (has links)
Thesis (M.S.)--University of Texas at El Paso, 2009. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.
19

Avaliação da resistência a flexão de liga de titânio submetida a soldagens laser e TIG, visando a prótese dentária

CARDOSO, LORENA M. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:54:10Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:09:10Z (GMT). No. of bitstreams: 1 12699.pdf: 1264556 bytes, checksum: ba1866e899ee4bcfff59125ceac32412 (MD5) / Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia) / IPEN/D-MPLO / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo , Sao Paulo
20

Avaliação da resistência a flexão de liga de titânio submetida a soldagens laser e TIG, visando a prótese dentária

CARDOSO, LORENA M. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:54:10Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:09:10Z (GMT). No. of bitstreams: 1 12699.pdf: 1264556 bytes, checksum: ba1866e899ee4bcfff59125ceac32412 (MD5) / Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia) / IPEN/D-MPLO / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo , Sao Paulo

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