Naslov
Thermodynamic Calculations and Phase Transformation Temperatures of Cu-Al-Mn Alloys

Autori
Holjevac Grgurić, Tamara

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Book of Abstracts of the 12th European Symposium on Thermal Analysis and Calorimetry(ESTAC 12) / Rotaru, Andrei ; Popescu, Crisan - Bukurešt, 2018, 1-13

ISBN
978-3-940237-50-7

Skup
12th European Symposium on Thermal Analysis and Calorimetry (ESTAC12)

Mjesto i datum
Brašov, Rumunjska, 27.08.2018. - 30.08.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Cu-Al-Mn ; martensitic ; phase transformation

Sažetak
Cu-Al-Mn shape memory alloys became very attractive for commercial use in the bioengineering, dental industry and in the high-demand industry for sensors or actuators, and more often they replace very expensive Ni-Ti alloy, due to their low cost, superelasticity and high ductility. Addition of manganese to binary Cu-Al alloy, broadens -phase region, parent phase for formation of martensitic structure, `-phase, what increase ductility and cold workability of material. Further addition of alloying elements influences to decreasing of grain size, changes of phase transformation temperatures, mechanical properties and shape memory effect. In this paper, microstructure and phase transformation temperatures of Cu-Al-Mn alloys with different aluminium content were investigated. Cu-Al-Mn alloys were prepared by melting in the electric-arc furnace and casted in the moulds dimensions 8 mm*1.2 cm. After casting, alloys were heat-treated for 2 weeks at 300 °C in the furnace and quenched in the water. Thermodynamic calculation and solidification mechanism was performed by software Thermo-Calc 5, with thermodynamic data according to Miettinen. Transformation temperatures of Cu-Al-Mn-Ag alloys were carried out by differential scanning calorimetry (DSC) through two dynamic cycles in the nitrogen atmosphere. Microstructural investigations were performed by optical microscopy (OM) and scanning electron microscopy (SEM), while chemical content of specimens was determined by energy-dispersive spectrometry (EDS). XRD analysis was performed to examine present phases. Microstructural results were correlated with aluminum content and thermodynamic calculations as well as determined transformation temperatures.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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