engleski

Utjecaj srebra na legure s efektom prisjetljivosti oblika na bazi bakra

Shape memory alloys are a special type of materials that, when deformed below a certain temperature, can return to their original shape before deformation simply by heating. Alloys with this atypical property are used as functional materials in temperature sensors, actuators and clamping devices. SMA materials also have a property called superelasticity. It is rubber like property, but when bent or stretched, it returns to its original shape when the deforming force is removed. This property is used in everyday products such as electrical and electronic equipment, as well as in the medical and optical fields. [1, 2, 3] The Cu-Al-Ag alloy Cu based with 10 wt% Al and 1 wt% Ag was prepared in the electric arc furnace. The alloy was remelted 4 times for better homogenization and cast into a cylindrical mould with dimensions of 8 mm x 12 mm. Heat treatment was performed at 900°C for 30 minutes, followed by quenching in water. The microstructure of the characteristic states of the studied alloy was observed using an optical microscope (OM) and a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy detector (EDS). The martensitic and austenitic transformation temperatures were determined using the Differential Scanning Calorimeter (MDSC). Hardness was determined using the Future Tech FM-ARS -F 9000 with FM-700 microhardness tester. The results showed fully formed martensite structure, with different types of martensite, in quenched Cu-10Al-1Ag samples.

Cu-based alloys ; Cu-Al-Ag alloys ; Microstructure ; Phase transformations

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