izvorni znanstveni rad
Shape memory alloys (SMAs) have a wide range of applications (medical, automotive, seismic damping, mechanical coupling, actuator applications, etc.). For their wider use, welding techniques are becoming increasingly important to obtain complex shaped devices and other components. Therefore, in this work, 82.3% Cu-8.3% Al-9.4% Mn (in wt. %) shape memory alloy was investigated before and after tungsten inert gas (TIG) welding. The results of the optical microscopy (OM) and scanning electron microscopy (SEM) analyses showed that a martensite microstrucure is present in every part of welding joints, but with different grain size. The grain size into weld metal (WM) is finer due to the remelting of base metal (BM) and filler material, which has the same chamical composition. The results of the energy dispersive spectroscopy (EDS) analyses showed that the average chemical compositions of BM and heat affected zone (HAZ) are quite similar, while in WM the aluminium content is lower due to evaporation. Cracks and intermetallic phases in the weld joint did not occurred. The martensite microstructure is determined in the as-cast state, after heat treatment and after welding. In these alloys, the martensite structure is the basic prerequisite for the shape memory effect.
shape memory alloy, continuous casting, rolling, heat treatment, welding, martensite
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