Volume 23 Preprint 108

Effect of particles size variation on the microstructure, mechanical and corrosion properties of TiNi- nano silica reinforced composites

Mairaj Ahmad

Keywords: Nanocomposites, Nitinol, Phase Transformation, Vicker, Corrosion

<p>Titanium-nickel pre-alloyed particles were reinforced with silica particles of constant volume percent with sizes varying as proceeding 50, 100, 250, and 500 nm. The weighed compositions were mixed in a planetary ball mill, followed by compaction via uniaxial compression of 50 MPa. The resultant green pellets were sintered in an argon atmosphere at 1223K for a period of 4 hrs. Following that, by using EDM the composite pellets were sectioned, soldered and cold mounted. Microstructure analysis was performed optical microscopy, micro Vickers hardness testing for mechanical evaluation followed by potentiodynamic polarization and electrical impedance spectroscopy (EIS) for electrochemical evaluation whereas the effect of particle size at constant volume on the densification was determined via the Archimedes Principle. The reinforcement showed increasing hardness and increase in phase distribution in addition to the effect complimented by the transformation of silica whereas electrochemical evaluation was affected by both reinforcement and phase distribution.<br></p>

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