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作者（2019）在《Synthesis and characterization of the nanostructured solid solution with extended solubility of graphite in nickel by mechanical alloying》一文中研究指出：In the present work, mechanical alloying of a powder mixture of nickel and graphite(up to 15 wt%) was carried out in an attrition mill under a nitrogen atmosphere.The as-milled powders were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), and transmission electron microscopy(TEM).The 15 wt% graphite dissolved into the nickel(exceeding the negligible solid solubility in the nickel–carbon system), thereby forming a supersaturated solid solution of graphite in a nickel matrix.The dissolved graphite occupied interstitial positions along the dislocation edges and at the grain-boundary regions.A three-step graphite dissolution mechanism has been proposed.The associated changes in the nickel lattice, such as changes in the crystallite size(62 to 43 nm), lattice strain(0.12% to 0.3%), and lattice parameter(0.3533 to 0.3586 nm), which led to the formation of the supersaturated solid solution, were also evaluated and discussed.
Abstract
In the present work, mechanical alloying of a powder mixture of nickel and graphite(up to 15 wt%) was carried out in an attrition mill under a nitrogen atmosphere.The as-milled powders were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), and transmission electron microscopy(TEM).The 15 wt% graphite dissolved into the nickel(exceeding the negligible solid solubility in the nickel–carbon system), thereby forming a supersaturated solid solution of graphite in a nickel matrix.The dissolved graphite occupied interstitial positions along the dislocation edges and at the grain-boundary regions.A three-step graphite dissolution mechanism has been proposed.The associated changes in the nickel lattice, such as changes in the crystallite size(62 to 43 nm), lattice strain(0.12% to 0.3%), and lattice parameter(0.3533 to 0.3586 nm), which led to the formation of the supersaturated solid solution, were also evaluated and discussed.
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