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Sunday, October 18, 2020 | History

2 edition of Low temperature deformation characteristics of yttrium single crystals found in the catalog.

Low temperature deformation characteristics of yttrium single crystals

Michael Sokaski

Low temperature deformation characteristics of yttrium single crystals

by Michael Sokaski

  • 18 Want to read
  • 16 Currently reading

Published .
Written in English

    Subjects:
  • Yttrium.

  • Edition Notes

    Statementby Michael Sokaski.
    The Physical Object
    Pagination[14], 161 leaves, bound :
    Number of Pages161
    ID Numbers
    Open LibraryOL14238161M

    -single crystals -polycrystalline materials deformation at room temperature) increase dislocations density that leads to resistance of dislocation motion by other dislocations. Low angle boundaries are less effective in blocking than high angle ones. 1: Reduction of Grain Size. Rare-earth ions doped yttrium aluminum garnet (Y 3 Al 5 O 12, YAG) single crystals have been widely used as the host material for solid-state lasers due to the high transmittance, high strength.

    An advanced Ni-base single-crystal superalloy, TMS, has the highest temperature capability, but there is still potential to improve its high-temperature properties. The thermal expansion 5– K and low-temperature heat capacity (up to 70 K) studies were performed on samples which were cut from the zone-melted YB 12 tricrystal and on LuB 12 and single crystals. The lattice parameter of the LuB 12 single crystal coincides with the powder one due to the rigid boron sublattice; the YB 12 tricrystal.

    Crystal: Space Group By definition crystal is a periodic arrangement of repeating “motifs”(e.g. atoms, ions). The symmetry of a periodic pattern of repeated motifs is the total set of symmetry operations allowed by that pattern • Let us apply a rotation of 90 degrees about the center (point) of the pattern which is thought to be indefinitely.   Metal single crystals of submicrometer dimensions with very low initial defect density often exhibit ultrahigh strength (1, 2) and large elastic strain, which offer opportunities for obtaining unprecedented physical and chemical characteristics by elastic strain engineering ().High-temperature crystal growth (4, 5) or thermal annealing to eliminate structural defects such as dislocations.


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Low temperature deformation characteristics of yttrium single crystals by Michael Sokaski Download PDF EPUB FB2

First order prism slip in yttrium single crystals containing a total interstitial impurity content of about wt ppm is almost entirely stage II deformation with a work hardening rate θ/μ of 210⁻ ³.

The athermal temperature is about ° by: 1. adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86ACited by: 1. Low temperature deformation characteristics of yttrium single crystals. Abstract. Graduation date: First Low temperature deformation characteristics of yttrium single crystals book prism slip in yttrium single crystals containing a total interstitial impurity content of about wt ppm is almost entirely stage II deformation with a work hardening rate θ/μ of 210⁻ ³.

The athermal temperature is. The superconducting properties of high purity single crystals of niobium, tin, indium and lead (RRR>) and of less pure niobium and rhenium (RRR≈) were studied directly under low temperature deformation.

Y 1 B 2 Cu 3 0 7_x ceramic samples annealed in oxygen (x≈0) had T c ≈93–96 K. To deform them without damage they were. Yttrium silicate is attractive for its low-elastic modulus, low CTE (similar to that of SiC), low-evaporation rate, low-oxygen permeability, low-SiO 2 activity, and good erosion resistance.

Yttrium silicate can be in the form of yttrium monosilicate (Y 2 SiO 5) or yttrium disilicate (Y 2 Si 2 O 7), where yttrium. The five independent elastic constants for yttrium single crystals have been determined by the pulse‐echo technique over the temperature range, –°K. The experimental values extrapolated to 0°K are: C11=±, C33=±, C44=±, C12=±, and C13=± in units of d/cm2.

The degree of elastic anisotropy is low throughout the entire temperature. The five independent elastic constants for yttrium single crystals have been determined by the pulse‐echo technique over the temperature range, –°K.

The experimental values extrapolated to 0°K are: C 11 =±, C 33 =±, C 44 =±, C 12 =±, and C 13 =± in units of 10 11 d/cm degree of elastic anisotropy is low throughout the entire. Yttrium also finds use in fuel cells for powering cars and buses, computers and digital phones and, potentially, buildings.

A small amount of yttrium oxide is added to zirconium oxide to make what is known as yttria-stabilized zirconia (also called YSZ). In pure magnesium single crystals, second order pyramidal (c+a) slip (SPCS) was observed at K.

Above room temperature, first order pyramidal (c+a) slip (FPCS) was active. In the Mg - () Y alloy single crystals, FPCS was observed at 77K to K, while yield stress of the Mg-Y alloy single crystals was higher than that of pure magnesium. A bulk single crystal of n-type SiC with the 6H-type crystal structure (hP12, Space group: P6 3 mc (#), a = nm, c = nm) was purchased from TanKeBlue semiconductor Co., Ltd.

The micropipe density in the single crystal of the semiconductor-grade was estimated to be as low as 11 cm −2. Orientations of the bulk single crystals.

The high temperature deformation properties of single crystals of stoichiometric NiAl have been studied in tension creep and in constant strain rate compression at temperatures between and. A facile and straightforward approach has been implemented for the synthesis of nanostructured Y 2 O 3 particles via sol-gel method from yttrium nitrate solution.

The individual effects of calcination temperature, precipitation-chelating agent and precursor concentration on microstructural parameters, crystal defects and morphology of Y 2 O 3 were investigated in detail. Low Temperature Deformation Characteristics of Yttrium Single Crystals by Michael Sokaski A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Completed Commencement June The high-temperature deformation properties of stoichiometric NiAl single crystals have been studied in the temperature range from °C and °C.

We have established a basic data set for and have explored the high-temperature deformation characteristics of this intermetallic compound.

The results provide a basis for determining the controlling mechanisms of high-temperature deformation. High‐temperature creep behavior of yttria fully stabilized zirconia single crystals with various yttria contents in the interval ≤x≤ 21 mol% has been mechanical data have been collected as a function of both the temperature and the yttria concentration.

Results obtained for a new material, namely, zirconia crystals stabilized by Y2O3 and CeO2 and containing a technological addition of neodymium oxide, tested at room temperature are described. Special features of the surfaces of the crystal blocks grown and the distribution of the additions introduced into the charge over their height are investigated.

The dependences of the amounts of the. thorough examination of low-temperature behaviour of yttrium aluminium garnet Y 3Al 5O 12 and yttrium alu-minium perovskite AlOY 3 two most important tech-nological crystals in the rich family of group III metal--aluminium oxides.

Experimental Single crystals of AYG and AP:NdY were grown by the Czochralski method in Scienti c Research Company.

Recently, in the low temperature infrared 2 F 5/2. 2 F 7/2 absorption of Ce:YAG [1] or Ce:GGG single crystals [2], the presence of strong lines at cm À1 in YAG and cm À1 in GGG was.

Tensile tests and modelling. All plastic deformation was conducted on a Zwick/Roell kN tensile testing machine at a strain rate of sSpecimens were mill-cut from sheets perpendicular to the rolling direction, with a width of mm and a reduced section of 57 mm [].Tensile tests were carried out at room temperature (RT, ~ K) and under liquid nitrogen (LN 2, 77 K) using.

Polycrystalline neodymium‐doped yttrium aluminum garnet (YAG), Nd: Y 3 Al 5 O 12, has been produced in a transparent form and is being considered as a substitute for single crystal YAG in laser determine whether such a substitution could impact mechanical reliability, it is critical to compare the baseline mechanical properties of the single crystal and polycrystalline materials.

In section 4, the deformation and removal characteristics of semiconductor and laser single crystals involved in grinding are discussed, with an emphasis on the grinding process that has extremely small material removal, so the deformation should .[Show full abstract] value for single crystals and the fracture toughness was estimated to be times larger than that for single crystal.

The deformation structure and morphology of the. The Distribution and Retention of Yttrium and Lanthanum in Cast Single Crystal Superalloys (Pages: ) S.P. Leyland High Temperature Properties of a Single Crystal Superalloy PWA Directly Recycled After Turbine Blade Use (Pages: ) Discussing the Effect of Gamma Prime Coarsening on High Temperature Low Stress Creep.