Materials Engineering / Mechanical Engineering / Scanning Electron Microscopy / Metal matrix composite / Wear / Current Density / Nickel / X ray diffraction / Particle Size / Microstructures / Wear resistance / Zeta Potential / Direct Current / Volume Fraction / Current Density / Nickel / X ray diffraction / Particle Size / Microstructures / Wear resistance / Zeta Potential / Direct Current / Volume Fraction