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  1. No Access

    Article

    Growth and Facet Orientations in Single-Phase TiAl Single Crystals

    Single crystals of single-phase TiAl alloy (Ti-56 at. % Al) have been grown at 10mm/h solidification rate in an ASGAL FZ-SS35W Optical Floating Zone Furnace. The orientations of the resulting single crystals h...

    R. Mahapatra, H. Lin, D. P. Pope, Y. T. Chou in MRS Online Proceedings Library (1994)

  2. No Access

    Article

    Fracture behavior of fused quartz with laser-induced internal flaws

    Pulsed-laser light was used to generate internal flaws in fused quartz. The size of the flaw produced was proportional to the amount of laser pulse energy above a threshold value of 2.5 mJ. Specimens of differ...

    Y. Z. Li, M. P. Harmer, Y. T. Chou in Journal of Materials Research (1994)

  3. No Access

    Article

    Observation of laser-induced internal flaws in PMMA

    B. Zhou, Y. T. Chou in Journal of Materials Science Letters (1993)

  4. No Access

    Article

    Alloy softening in Ni3Al polycrystals

    The alloying effect of boron on localized deformation in Ni3Al polycrystals containing 24–26 at% AI was studied using microhardness indentation. Alloy softening was observed both along the grain boundaries and in...

    X. R. Qian, Y. T. Chou in Journal of Materials Science (1992)

  5. No Access

    Article

    Cation interdiffusion between thick film of YBa2Cu3O7-δ and ceramic substrate

    Thick films of superconducting oxides, YBa2Cu3O7-δ, were successfully made by conventional screen-printing technology on Al2O3, MgO, and ZrO2 substrates. Interdiffusion between the superconductive film and substr...

    X. M. Li, Y. T. Chou, Y. H. Hu, C. L. Booth in Journal of Materials Science (1991)

  6. No Access

    Article

    Uphill diffusion in YBa2Cu3O7-δ thick film on Al2O3 substrate

    X. M. Li, Y. T. Chou, Y. H. Hu, C. L. Booth in Journal of Materials Science Letters (1990)

  7. No Access

    Article

    Interfacial Failure In Ti/Sio2 and Ti/AIN System And Temperature Dependence Of Hardness Of AIN

    The load dependence of interracial failure induced by microindentation has been studied. It is demonstrated experimentally that substrate lateral defects induced by indentation contribute significantly to inte...

    T. Liu, R. Notis, Y. T. Chou in MRS Online Proceedings Library (1989)

  8. No Access

    Article

    Grain Boundary Softening in Boron-Doped Ni3Al

    The effect of 0.2 at.% boron on grain boundary hardness in Ni3Al containing 24 to 26 at.% Al was studied. Normal grain boundary hardening was observed in all alloys with and without boron. However, the addition o...

    X. R. Qian, Y. T. Chou in MRS Online Proceedings Library (1988)

  9. No Access

    Article

    The effect of Sn, AI, and N on the hot ductility of a carbon-manganese steel between 700° and 1200 °C

    The effect of Sn and Al-N additions on the hot ductility of a C-Mn steel has been investigated in a series of laboratory melted steels. The addition of either Sn or Al-N produced a similar degree of ductility ...

    W. T. Nachtrab, Y. T. Chou in Metallurgical Transactions A (1988)

  10. No Access

    Article

    High temperature ductility loss in carbon-manganese and niobium-treated steels

    The causes of embrittlement in several plain carbon-manganese and niobium-treated steels between 800 and 1200 °C have been investigated. Tensile ductility was measured as a function of temperature and strain r...

    W. T. Nachtrab, Y. T. Chou in Metallurgical Transactions A (1986)

  11. No Access

    Article

    Equilibrium shapes of Ni3Al crystallites formed during diffusion anneal

    T. C. Chou, Y. T. Chou in Journal of Materials Science Letters (1985)

  12. No Access

    Article

    Volume and Grain Boundary Diffusion in Li2 Alloys with Special Reference to Ni3Al Compounds

    Experiment and theory of diffusion in Li(2) alloys are briefly reviewed.* Current work on volume and grain boundary diffusion in Ni(3)Al alloys are presented and discussed.

    T. C. Chou, Y. T. Chou in MRS Online Proceedings Library (1984)

  13. No Access

    Article

    Grain boundary segregation of copper, tin and antimony in C-Mn steels at 900°C

    The segregation of copper, tin and antimony to austenite grain boundaries at 900° C has been investigated in C-Mn steels using a scanning Auger microprobe (SAM). The specimens for microanalysis were prepared i...

    W. T. Nachtrab, Y. T. Chou in Journal of Materials Science (1984)

  14. No Access

    Chapter

    Manufacture and Superconducting Properties of Bronze Processed Nb3Sn Monofilamentary Wires with Be Additions

    In the previous reports [l–3], it was demonstrated that cold hydrostatic extrusion can be used effectively in manufacturing Nb3Sn superconductors by the bronze process.

    J. Z. Pan, B. Avitzur, Y. T. Chou… in Advances in Cryogenic Engineering Material… (1984)

  15. No Access

    Chapter

    Superconducting and Mechanical Properties of Cold Hydrostatically Extruded Monofilamentary Nb3Sn Wires

    In the conventional bronze technique of manufacturing multifilamentary Nb3Sn superconducting wires (Fig. 1), a composite billet having niobium cores in a bronze sleeve is hot-extruded and drawn down to a rod. The...

    V. Thadani, T. S. Luhman, B. Avitzur… in Advances in Cryogenic Engineering Material… (1982)

  16. No Access

    Chapter

    How Effectively can Grain Boundaries Pin Flux Lines?

    Some years ago, a theorist on flux pinning would have dismissed the idea that grain boundaries can pin fluxoids in type II superconductors, because the width of a grain boundary is usually much smaller than th...

    A. DasGupta, C. C. Koch, D. M. Kroeger, Y. T. Chou in Advances in Cryogenic Engineering (1978)

  17. No Access

    Article

    Orientation dependence of the energy of slit cracks in bcc refractory metals

    The elastic energy of a two-dimensional slit crack in bcc refractory metals (Fe, Nb, Ta, Cr, V, Mo and W) is analyzed as a function of crystallographic orientation. Approximate energy expressions are obtained ...

    H. C. Yang, Y. T. Chou in Metallurgical Transactions A (1975)

  18. No Access

    Article

    Energy, stability, and peierls stress of glide dislocations in anisotropie BCC crystals

    The elastic energyE of a straight glide dislocation in bec crystals is analyzed as a function of crystal orientation. Approximate energy functions are obtained for dislocations on the 110, 112, and 123 slip plane...

    Y. T. Chou, G. T. Sha in Metallurgical Transactions (1972)

  19. No Access

    Article

    Effect of grain boundary dislocations on the slope of the Hall-Petch relation

    Y. T. Chou, C. S. Pande in Metallurgical Transactions (1972)

  20. No Access

    Article

    The role of dislocations in the flow stress grain size relationships

    Calculations involving pile ups of dislocations, both analytical and numerical, using either discrete dislocations or continuous distribution of dislocations of infinitesimal Burgers vectors, are reviewed in t...

    J. C. M. Li, Y. T. Chou in Metallurgical Transactions (1970)

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