Ni-P amorphous phases obtained by Nd-YAG pulsed laser alloying of deposited Ni-P coating with aluminum

摘要

Ni-P electroless deposited coating with crystalline morphology was prepared on aluminum substrate. A Nd-YAG pulsed laser was used to alloy the materials at the condition of power density 5.36 X 10~9 Wr and scanning speed 3.0 mm/s. In the laser alloyed layer, Ni-P amorphous phases were found by means of TEM. Electron diffraction patterns and X-ray diffraction results showed that these Ni-P amorphous phases were decomposed as Ni and Ni_3P equilibrium phases when tempered at temperature over 300 deg C.