NANOCRYSTALLINE INTERMETALLIC COMPOUNDS - STRUCTURE AND MECHANICAL-PROPERTIES. HAUBOLD, T., BOHN, R., BIRRINGER, R., & GLEITER, H. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 153(1-2):679--683, May, 1992. WOS:A1992JC00700051
doi  abstract   bibtex   
Nanocrystalline intermetallic compounds (Ni3Al, NiAl, TiAl) with crystallite sizes in the range 5-20 nm were prepared by means of an inert gas condensation technique. As-prepared nanocrystalline Ni3Al samples (24 at.% Al) exhibited no superlattice reflection in X-ray diffraction (XRD) and transmission electron microscopy. Ordering occurred during annealing starting at 400-degrees-C. In contrast, as-prepared nanocrystalline NiAl samples (50 at.% Al) were at least partially ordered. XRD spectra of as-prepared nanocrystalline TiAl samples (54 at.% Al) suggested that these samples consisted of a mixture of alpha(2)-Ti3Al and gamma-TiAl. Vickers hardness measurements showed that nanocrystalline samples were substantially harder than polycrystalline indicating that grain refinement caused strengthening. Hot pressing at temperatures up to 650-degrees-C under high vacuum conditions results in retarded grain growth compared with annealing.
@article{ haubold_nanocrystalline_1992,
  title = {{NANOCRYSTALLINE} {INTERMETALLIC} {COMPOUNDS} - {STRUCTURE} {AND} {MECHANICAL}-{PROPERTIES}},
  volume = {153},
  issn = {0921-5093},
  doi = {10.1016/0921-5093(92)90270-B},
  abstract = {Nanocrystalline intermetallic compounds (Ni3Al, {NiAl}, {TiAl}) with crystallite sizes in the range 5-20 nm were prepared by means of an inert gas condensation technique. As-prepared nanocrystalline Ni3Al samples (24 at.% Al) exhibited no superlattice reflection in X-ray diffraction ({XRD}) and transmission electron microscopy. Ordering occurred during annealing starting at 400-degrees-C. In contrast, as-prepared nanocrystalline {NiAl} samples (50 at.% Al) were at least partially ordered. {XRD} spectra of as-prepared nanocrystalline {TiAl} samples (54 at.% Al) suggested that these samples consisted of a mixture of alpha(2)-Ti3Al and gamma-{TiAl}. Vickers hardness measurements showed that nanocrystalline samples were substantially harder than polycrystalline indicating that grain refinement caused strengthening. Hot pressing at temperatures up to 650-degrees-C under high vacuum conditions results in retarded grain growth compared with annealing.},
  number = {1-2},
  journal = {Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing},
  author = {HAUBOLD, T. and BOHN, R. and BIRRINGER, R. and GLEITER, H.},
  month = {May},
  year = {1992},
  note = {{WOS}:A1992JC00700051},
  pages = {679--683}
}

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