Fig. 7-Vickers hardness vs depth from the softfaced brass layer to the substrate.Fig. 1-SEM micrograph showing a nickel foam. The aluminum melt is infiltrated into this nickel foam to form an aluminum-nickel composite piston ring.Fig. 2-Optical micrographs of the A specimen (aluminum-nickel composite piston ring), showing (a) nickel foam, primary silicon particles, and eutectic silicon particles and (b) a layered structure along the Ni/Al interface.
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