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MICROSTRUCTURES OF CRYSTALLITES IN NANOCRYSTALLINE Ni-P ALLOYS |
SUI Manling (Northeastern University;Internattonal Centre for Materials Physics.Chinese Academy of Sciences; Shenyang);LU Ke (National Laboratoryfor RSA Insti tute of Metal Research; Chinese Academy of Sciences;Shenyang) |
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Cite this article:
SUI Manling (Northeastern University;Internattonal Centre for Materials Physics.Chinese Academy of Sciences; Shenyang);LU Ke (National Laboratoryfor RSA Insti tute of Metal Research; Chinese Academy of Sciences;Shenyang). MICROSTRUCTURES OF CRYSTALLITES IN NANOCRYSTALLINE Ni-P ALLOYS. Acta Metall Sin, 1994, 30(21): 413-419.
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Abstract Different grain-sized nanocrystalline Ni-P alloy samples with two crystalline phases of a Ni solid solution and a Ni_3P compound have been synthesized by the crystallization method. By means of the X-ray diffraction technique, variations of the lattice parameters of these two nanophases with the grain size were determined. It was found that the values of the lattice parameters for the two nanophases obviously deviated from the equilibrium data for the corresponding perfect crystals. Analysis of the experimental results indicated that the P concentration in the Ni(P) solution nanophase was much enhanced, being about 10-1 5 times as much as the equilibrium solubility, and a highly supersaturated Ni(P)solid solution formed in the nanophase samples. For the Ni_3P nanophase, an evident lattice distortion was detected, and the lattice distortion of the Ni_3P nanophase increases with a reduction in grain size, which might be oringinated from an enhancement of the vacancies in the nanometer-sized crystallites.
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