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Structure of shear bands in Pd<sub>40</sub>Ni<sub>40</sub>P<sub>20</sub> bulk metallic glass
Chen, Y.M.,Ohkubo, T.,Mukai, T.,Hono, K. Cambridge University Press (Materials Research Soc 2009 Journal of materials research Vol.24 No.1
<P>The atomic structure of shear bands in Pd40Ni40P20 bulk metallic glass has been compared to an undeformed matrix phase using pair distribution functions (PDFs) derived from energy filtered nanobeam electron diffraction. Shear bands do not show any characteristic contrast in transmission electron microscopy (TEM) images when specimens are prepared with uniform thickness. PDFs from a shear band exhibit a slight decrease in the first peak, indicating a slight difference in packing density and short range order compared to the undeformed matrix.</P>
Sasaki, T.T.,Hono, K.,Vierke, J.,Wollgarten, M.,Banhart, J. Elsevier Sequoia 2008 Materials science & engineering. properties, micro Vol.490 No.1
Amorphous Al<SUB>85</SUB>Ni<SUB>10</SUB>La<SUB>5</SUB> powders were consolidated to cylindrical samples by spark plasma sintering (SPS), and their microstructures and mechanical properties were investigated. When the powders were consolidated below the crystallization temperature, an amorphous phase was retained in the consolidated sample. Sintering above the crystallization temperature caused full crystallization. The Vickers hardness of the amorphous-containing sample was about 350HV in the as-sintered state and increased up to 450HV by a subsequent heat treatment just below the crystallization temperature. The highest hardness was achieved in a nanocrystalline microstructure. Compression tests revealed the brittle nature of the consolidated samples although the fracture and yield strength was higher than 1GPa. The brittleness is due to the low relative density of the amorphous-containing samples and the presence of a large amount of intermetallic compounds in the fully crystallized sample.