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  1. No Access

    Article

    Surface Energy Anisotropy of Diffusion-Induced Ni3 A1 Crystals

    Faceted crystals with well-defined {100}, {110}, and {1111 surfaces were observed in the interdiffusion zone during chemical interdiffusion of Ni/Ni 3 Al diffusion couple in the temperature range of 800°−1200°...

    T. C. Chou, Y. T. Chou in MRS Online Proceedings Library (2011)

  2. No Access

    Article

    The Effect of Boron on Microhardness in Ni3 Al Polycrystals

    In a recent MRS symposium, the effect of boron on grain boundary hardness (GBH) in Ni3Al was reported. Addition of 0.2 at.% of boron decreased the GBH in all three sets of alloys tested (24, 25, and 26 at.% Al). ...

    X. R. Qian, Y. T. Chou in MRS Online Proceedings Library (2011)

  3. No Access

    Article

    Wet oxidation kinetics of AlAs at elevated temperatures

    Wet oxidation in the AlAs layer sandwiched between two GaAs plates was investigated for the temperature range of 400 to 480 °C. The oxidation rate increased with increasing thickness of the AlAs layer. Theoret...

    Sun-Chien Ko, Sanboh Lee, Hai-Lin Wang, Y. T. Chou in Journal of Materials Research (2003)

  4. No Access

    Article

    Decomposition and thermodynamic property of metastable Fe-Zn solid solutions produced by mechanical alloying

    Thermal decomposition of supersaturated single-phase body-centered cubic (bcc) Fe100−xZnx (5≤ x ≤65 at.%) solid solutions, processed via mechanical alloying of high-purity metal powders, was investigated using x-...

    F. Zhou, Y. T. Chou, E. J. Lavernia in Journal of Materials Research (2002)

  5. No Access

    Article

    Chemical stresses induced by grain-boundary diffusion in thin films

    Chemical stresses induced by grain-boundary diffusion in thin films were analyzed. The stress distribution consisted of both tension and compression fields, and its characteristics were similar to those obtain...

    W. L. Wang, Y. T. Chou, Sanboh Lee in Journal of Materials Research (2001)

  6. No Access

    Article

    Fractal characterization of the fracture surface of a high-strength low-alloy steel

    The fractal dimension of fracture surfaces of a high-strength low-alloy steel (ASTM A710) has been measured using different ruler lengths. The fractal dimension increases with increasing impact toughness, E, a...

    J. C Hsiung, Y. T Chou in Journal of Materials Science (1998)

  7. No Access

    Article

    An experimental study of the interaction of internal cracks in PMMA

    Internal cracks in polymethyl methacrylate (PMMA) specimens were generated by pulsed laser light. The interactions of coplanar cracks, parallel cracks, and cracks in T and H configurations were investigated. T...

    Y. Z LI, Y. T CHOU in Journal of Materials Science (1997)

  8. No Access

    Article

    Deformation mechanism map for creep in YBa2Cu3O7−x

    A deformation mechanism map with grain size and stress as variables was constructed for creep in YBa2Cu3O7−xat 850 and 950 °C. Theoretical models of Nabarro-Herring, Coble, and power-law creep were used for the c...

    J. Yun, M. P. Harmer, Y. T. Chou in Journal of Materials Science (1995)

  9. 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)

  10. 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)

  11. 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)

  12. 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)

  13. 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)

  14. 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)

  15. 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)

  16. 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)