Thermal Expansion Coefficient Investigation of Al 2024/Cu-Al-Ni Adaptive Composites

Mechanical Engineering

National Conference on "Recent Advances in Materials Science & its Applications" & "Recent Trends in Electrical, Electronics, Computing and Information Technology"

In last few decades, smart materials have been developed extensively and have become an important topic for researchers in microelectronics and micro electro mechanical systems (MEMS). The shape memory alloy is a good candidate material for active control of the smart systems. The coefficient of thermal expansion is an important mechanical property for shape memory particulate reinforced composites. There are several problems that arise from the thermal expansion effect; for example, the mismatch of thermal expansion between particulates and host matrix which may lead to residual stresses in the composites. Shape memory alloys experience shape memory effect at their service temperature. This shape memory effect can vary the expansion properties of adaptive composites by changing residual stress field. In this investigation, the expansion coefficient with particulate volume fractions was investigated using thermo mechanical analyser (TMA). The stir casting technique is used to prepare the castings and machined accordance to ASTM standards followed by heating to bring shape memory effect in the pre strained particles. The expansion coefficient was calculated by subjecting the as-cast and SME specimens, and then the experimental results were recorded. The expansion coefficient is found to be decreased with increase of SMA volume fraction and increased with increase in temperature of shape memory effect.

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