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  • Diffusion bonding and embossing of Zr[subscript 46.7]Ti[subscript 8.3]Cu[subscript 7.5]Ni₁₀Be[subscript 27.5] bulk metallic glass forming alloy

    Creator:
    Bothara, Manish G.
    Abstract:
    A Bulk Metallic Glass (BMG) is an amorphous solid with thickness greater than 1mm. Material properties of BMG, like twice the strength of regular steels and excellent corrosion resistance, make them ideal materials for fabrication of MEMS and MECS devices which have attracted a lot of research activity recently. Diffusion...
    Resource Type:
    Masters Thesis

  • Thermal stability of surface treated zirconium

    Creator:
    Hayes, Troy A.
    Abstract:
    Zirconium press plates have been developed for the production of melamine coated particle board, using shot-peening to achieve the desired plate (and therefore coated particle board) surface texture. Service temperatures of the press plates approach 200°C. This study examined the microstructural effects of extended exposure of shot-peened zirconium to temperatures...
    Resource Type:
    Masters Thesis
    Full Text:
    Thermal stability of surface treated zirconium AN ABSTRACT

  • Thermodynamics of the Pd₄₃Ni₁₀Cu₂₇P₂₀ metallic glass-forming alloy

    Creator:
    Kuno, Masahiro
    Abstract:
    By the investigation of the bulk metallic glass-forming liquids that have very low critical cooling rates, the thermodynamics of metallic glasses can be clarified. For studying thermodynamic properties, such as the specific heat capacity, calorimetry (DSC) is utilized and one of the most used instruments is the differential scanning calorimeter....
    Resource Type:
    Masters Thesis
    Full Text:
    alloy AN ABSTRACT OF THE THESIS OF Masahiro Kuno for the degree of Master of Science in Material

  • On the fragility and equilibrium phases of metallic glass forming alloys

    Creator:
    Shadowspeaker, Ludi A.
    Abstract:
    The heating rate dependence of the glass transition temperature of the Ni₆₅Nb₃₅, Ni₆₀Nb₃₅Sn₅, Ni₅₉.₃₅Nb₃₄.₄₅Sn62, Ni₆₀(Nb₄₀Ta₆₀)₃₄Sn₆, and Ni₅₇Fe₃Nb₃₅Sn₅ metallic glass forming alloys was investigated with a differential scanning calorimeter (DSC). The inverse heating rate for each DSC experiment was plotted versus inverse temperature and a Vogel-Fulcher- Tamman (VFT) type relation was...
    Resource Type:
    Masters Thesis
    Full Text:
    . This treatment assures that the samples have the same thermal history. When samples of the same alloy

  • Thermodynamis and kinetics of Zr₅₈̣₅Cu₁₅̣₆Ni₁₂̣₈Al₁₀̣₃Nb₂̣₈ bulk metallic glass forming alloy

    Creator:
    Shah, Minalben B.
    Abstract:
    Among recently found multi-component Zr-based bulk metallic glasses (BMG), Zr₅₈.₅Cu₁₅.₆Ni₁₂.₈Al₁₀.₃Nb₂.₈ is characterized by its lower critical cooling rate requirement and absence of beryllium as one of the constituent element which makes its handling more convenient. Its large supercooled liquid regions made possible the study of thermodynamics and kinetics of this...
    Resource Type:
    Masters Thesis
    Full Text:
    study of thermodynamics and kinetics of this alloy. Precise thermal measurements were performed using

  • Factors influencing the crystallization, phase and oxygen vacancy concentration in zirconia

    Creator:
    Karapetrova, Euguenia
    Abstract:
    In order to achieve a better understanding of the processes that occur during formation and sintering of zirconia, various chemical and physical techniques were used. Along with Perturbation Angular Correlation spectroscopy, that allowed us to investigate microscopic properties inside the nanometer-size zirconia grains, such techniques as Scanning Electron Microscopy and...
    Resource Type:
    Masters Thesis
    Full Text:
    impurities that remained in the oxide material. The thermal behavior of amorphous hydrated zirconium oxide

  • Rheological measurements of bulk metallic glass forming alloys above the liquidus temperature

    Creator:
    Shaw, Tyler A.
    Abstract:
    A high temperature high vacuum rheometer has been designed, fabricated, and tested for the study of the steady shear viscosity for multicomponent bulk metallic glass forming alloys. This rheometer has an operating range up to 1525 K, rotational frequencies of 9.4*10⁻³-3.7*10¹ radians/s, and a calibrated viscosity range of 9.6*10⁻³ and...
    Resource Type:
    Dissertation
    Full Text:
    ...................................................................................................2 0-2: Increased interatomic distance with increased thermal energy............. 3 0-3: Two

  • 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:
    high temperature creep properties of this alloy. The origin of these bands was therefore researched

  • Computer simulation of phase transitions in zirconia

    Creator:
    Love, Michael J.
    Abstract:
    Experimental data on the structural phase changes in zirconia are summarized. The computational techniques of molecular dynamics are reviewed and equations of motion are formulated which allow the study of phase changes as a function of temperature and pressure. The molecular dynamics program NPT which was written for this purpose...
    Resource Type:
    Dissertation
    Full Text:
    Computer Simulation of Phase Transitions in Zirconia Chapter 1 Introduction Zirconia (ZrO2, zirconium