Mairaj Ahmad
Keywords: Nanocomposites, Nitinol, Phase Transformation, Vicker, Corrosion
Abstract:
<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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