YOUNG'S MODULUS AND FATIGUE LIFETIME IMPROVEMENTS BY DIAMOND SIZE EFFECT ON ELECTROPLATED NI-DIAMOND NANOCOMPOSITE

摘要

Fatigue and Young's modulus characterizations have been investigated using the bending-test method on microsized cantilever-beam specimens made of electroplated Ni and Ni-diamond nanocomposites with different particle sizes (i.e. 350nm and 50nm in diameter). The experimental results show that electroplated Ni-diamond nanocomposite has slightly smaller fatigue strength than that of pure electroplated Ni due to the ductility reduction resulted by the nano-diamond particles. However, once the incorporated particle size of nano-diamond is reduced from 350nm to 50nm, it has been found that the electroplated Ni-diamond nanocomposite can have higher Young's modulus (13.6% enhancement, i.e. 178GPa) and comparable fatigue strength (～2.4GPa) with that of pure electroplated Ni.