Original scientific paper
https://doi.org/10.15255/KUI.2022.011
Effect of Heat Treatment on Microstructure and Thermal Properties of Cu-based Shape Memory Ribbons
Stjepan Kožuh
; University of Zagreb, Faculty of Metallurgy, Aleja narodnih heroja 3, 44 000 Sisak, Croatia
Ivana Ivanić
; University of Zagreb, Faculty of Metallurgy, Aleja narodnih heroja 3, 44 000 Sisak, Croatia
Tamara Holjevac Grgurić
; Catholic University of Croatia, Ilica 242, 10 000 Zagreb, Croatia
Mirko Gojić
; University of Zagreb, Faculty of Metallurgy, Aleja narodnih heroja 3, 44 000 Sisak, Croatia
Abstract
The aim in this work was to investigate the change in microstructure, phase transformation temperatures, and thermal properties due to the quenching of the investigated Cu-Al-Mn and Cu-Al-Mn-Ti alloys in ribbon form. This paper presents the results of microstructure analysis and thermal properties of Cu-Al-Mn and Cu-Al-Mn-Ti shape memory alloys produced in ribbon form by melt spinning technique. The microstructural analysis was carried out before and after quenching. After casting of the investigated alloys, annealing at 900 °C for 30 min was performed, followed by water quenching. The microstructural analysis was carried out by optical and scanning electron microscopy equipped with an energy dispersive spectrometer and by X-ray diffractometer. Thermodynamic calculation of a ternary Cu-Al-Mn system in equilibrium condition was performed using Thermo-Calc 5 software. Phase transformation temperatures were determined by differential scanning calorimetry and electrical resistance measuring. The results of microstructural analysis show the presence of martensite microstructures before and after quenching in the Cu-Al-Mn alloy, while in the Cu-Al-Mn-Ti alloy martensite microstructure exists only after quenching. Phase transformation temperatures decreased after quenching and titanium addition.
Keywords
Cu-Al-Mn; Cu-Al-Mn-Ti; shape memory alloys; microstructure characterisation; thermal analysis; X-ray spectroscopy
Hrčak ID:
283680
URI
Publication date:
21.9.2022.
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