engleski

Microstructure of Cu-Al-Mn shape memory ribbons casted by melt spinner

Cu-Al-Mn shape memory alloy could have a wide application due to their ductility. In this work the microstructure analysis of Cu-Al-Mn alloy after smelting (ingot) and casting (rapidly solidified ribbons) are shown. Alloy of composition Cu - 8.96%Al – 7.08 %Mn (wt.%) was prepared from pure metals and casted using melt spinning technique in Ar atmosphere. Before casting CuAlMn in the form of ingot (45 mm in diameter and 55 mm height, with weight of 684 g) is produced, this is used as input for melt spinner. Microstructure was analyzed by optical microscopy (OM) and scanning electron microscopy (SEM) equipped by device for energy dispersive spectroscopy (EDS). Microstructure analysis of rapidly solidified ribbons was performed before and after annealing at 900 °C (60 and 30 min) and quenching in water. Also, sequence of the microstructural changes in the rapidly solidified ribbons were determined by the in- situ measurement of the electrical resistance. Preliminary metallographic analysis of ingot confirmed that microstructure consisted from two-phases (alpha+beta), while in rapidly solidified ribbons presence of martensite was observed. Measurements of electrical resistance shows that phase transformations can be associated with precipitation of equilibrium alpha phase and with the order-disorder transition of austenite.

Cu-Al-Mn ; shape memory alloys ; microstructure ; martensite ; electrical resistance

Rad je objavljen i u Knjizi sazetaka ; str. 17-17 ; ISBN 978-953-7082-21-5.