Effect of Heat Treatment ZA-27 Alloy On Microstructure & Damping Properties

An objective of this work, investigate effect of heat treatment on microstructure and damping behaviour of ZA-27 alloy, using dynamic mechanical analyzer. ZA-27 alloys were fabricated and solid solution treatment at 120, 240 and 360 °C for 1 hr. Microstructure and physical properties of alloy were studied by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Results observed that microstructure of ZA27 alloy manufactured as_cast was composed of α ، β ، η and ε phases, then decomposed to β phase at 360 o C. DMA properties as: Storage modulus, Loss modulus and Damping capacity were studied both of ZA27 alloy as-cast and heat treatment at temperature range from Room Temperature to 300 o C. Results indicate that specific damping capacity and loss modulus of both as-cast and heat treatment alloy alloys decreased with increases in temperature, but storage modulus decreased with temperature.