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  • Dwell time low cycle fatigue in Ti-6242Si

    Creator:
    Faber, Robyn O.
    Abstract:
    Dwell time low cycle fatigue (DLCF), low cycle fatigue (LCF), and creep tests were performed at ambient temperature on Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242Si). Test specimens were solution annealed at various temperatures below the beta transus to control the volume fraction of primary alpha. The influence of the changes in primary alpha phase...
    Resource Type:
    Masters Thesis
    Full Text:
    determined and compared to the conventional low cycle fatigue properties of the alloy. A dwell period

  • Biaxial fatigue behavior of commercially pure titanium Ti-50A (Grade 2) and low-alloy titanium Ti-Code 12 (Grade 12) heat exchanger materials

    Creator:
    Tobias, Benjamin C.
    Abstract:
    Material failures in heat exchangers are often closely tied to events associated with the conditions of service and operating parameters. These events can generally be attributed to adverse load application and higher than optimum operating temperatures that could lead to changes in the microstructure of the materials and fatigue failure...
    Resource Type:
    Dissertation
    Full Text:
    account. Biaxial Fatigue Behavior of Commercially Pure Titanium Ti-50A (Grade 2) and Low-Alloy Titanium

  • The effect of primary alpha, nickel, and chromium on the creep properties of Ti 6242Si

    Creator:
    Thiehsen, Kurt
    Resource Type:
    Masters Thesis
    Full Text:
    high temperature aircraft engine components, the titanium alloy Ti 6A1- 2Sn-4Zr-2Mo-0.1Si is classified

  • Microstructural banding in thermally and mechanically processed titanium 6242

    Creator:
    Kansal, Utkarsh
    Abstract:
    Ti-6Al-2Sn-4Zr-2Mo-0.1Si specimens were shaped by repeated cycles of heating (to 954 °C) and hammer or press forging followed by a solution anneal that varied from 968 to 998 °C. The coupons were originally extracted from billets forged below the beta trans us ( 1009 °C) and slow cooled to ambient...
    Resource Type:
    Masters Thesis
    Full Text:
    observed as reported in some other 043 titanium alloy investigations. 4. It appears that the observed

  • Characterization of TiNbHf alloys for potential medical dental applications

    Creator:
    Amick, Darryl D.
    Abstract:
    A series of TiNbHf alloys ranging from 0-40 atomic % Nb and 0-15 atomic % Hf were evaluated to investigate low-elastic modulus phenomena which occur in this ternary system. The desirability of utilizing corrosion-resistant, biocompatible alloys with elastic modulus values approaching that of human bone for medical prosthetic implants provides...
    Resource Type:
    Masters Thesis
    Full Text:
    .2 These elements are niobium, tantalum, titanium, zirconium, and platinum. A new alloy, Til3Zr13Nb

  • An experimental flow model of a centifugal casting system

    Creator:
    Sewell, Janet M.
    Abstract:
    Centrifugal casting has been a successful technique for quickly filling molds, but little is understood about the fluid flow characteristics that occur during filling. The understanding of these flow characteristics and the application of this knowledge should improve the quality of metal parts cast by this process. The subject of...
    Resource Type:
    Masters Thesis
    Full Text:
    by fluid mechanics. 4 The Fluid Mechanics Problem For some metals such as titanium alloys, the

  • Mechanical properties of Nb-Ti composite superconducting wires

    Creator:
    Liu, He
    Abstract:
    Mechanical properties of Nb-Ti composite superconducting wires were tested at room temperature. The results were analysed using simple composite theory, the rule of mixtures. The objective is to predict the mechanical properties of Nb-Ti superconducting composite wires as a function of volume ratio and geometry of the components, the composite...
    Resource Type:
    Masters Thesis
    Full Text:
    . The two primary commercial materials are niobium based superconductors; Nb-Ti, an alloy, and Nb3Sn

  • Generating and using terahertz radiation to explore carrier dynamics of semiconductor and metal nanostructures

    Creator:
    Jameson, Andrew D.
    Abstract:
    In this thesis, I present studies in the field of terahertz (THz) spectroscopy. These studies are divided into three areas: Development of a narrowband THz source, the study of carrier transport in metal thin films, and the exploration of coherent dynamics of quasi-particles in semiconductor nanostructures with both broadband and...
    Resource Type:
    Dissertation
    Full Text:
    Spectroscopy of Nickel-Titanium (NiTi-alloy) Thin Films ......................... 53 5.1 NiTi Alloy Thin

  • Characterization of high temperature fatigue mechanisms in Haynes 282 nickel based superalloy

    Creator:
    Rozman, Kyle A.
    Abstract:
    Electric power needs will only grow over the next decades as more humans ascend from poverty into the middle class. Currently, the majority of electric power is generated by burning fossil fuels. To help mitigate the undesirable effects of burning fossil fuels research is being done to increase the efficiency...
    Resource Type:
    Dissertation
    Full Text:
    presented on October 24, 2014 Title: Characterization of High Temperature Fatigue Mechanisms in Haynes

  • Application of Titanium Alloy Bars for Strengthening Reinforced Concrete Bridge Girders in Flexure

    Creator:
    Vavra, Eric
    Abstract:
    Structurally efficient and cost-effective solutions are needed to extend the service-life of deficient and aging highway infrastructure around the world. One critical need is to increase the flexural strength of older reinforced concrete (RC) structures to carry heavier and more frequent loads. Titanium alloy bars (TiAB) offer a new opportunity...
    Resource Type:
    Masters Thesis
    Full Text:
    under exposure to simultaneous fatigue and freeze-thaw cycles. While the titanium alloy itself does