Investigation of the Enthalpy/Entropy Variation and Structure of Cu–Al–Mn–Fe Shape Memory Alloys

Abstract

Cu-based Cu-Al-Mn-Fe shape memory alloys were produced in an arc melter under vacuum. The crystal structure of the fabricated alloys were determined by means of X-ray diffraction (XRD). The XRD analysis results indicated that the martensitic phase of the samples have an M18R structure. The characteristic transformation temperatures, thermodynamic parameters, and the activation energy values of the samples according to Kissinger and Ozawa methods were determined by differential scanning calorimetry measurements. The austenite transformation temperatures (A s ) of the samples were found as 149.52 • C, 128.52 • C, and 103.86 • C, respectively. Also, the calculated activation energy values of the samples according to Kissinger and Ozawa methods are compared with each other. The effect of the presence of Al and Fe in the samples on the thermodynamic parameters is studied in this work.

Phase transformation and microstructure study of the as-cast Cu-rich Cu-Al-Mn ternary alloys

“…He reported that addition of Fe, Au, Zn, Ni and Ti improves shape memory effect (SM) of alloys, while Co, Si, Sn and Cr decrease temperature of martensitic transformation (M s ) as well as their ability to coldworkability. The effect of Ce on the microstructure and phase transformation temperatures on Cu-Al-Mn SMA alloy was reported by Chen [11], while Canbay presented the effect of Fe on the enthalpy and entropy values of Cu-Al-Mn-Fe system [12].…”

“…Cu-Al-Mn alloys display advantage in technological applications over other Cu-based SMA alloys, such as Cu-Al-Ni, Cu-Al-Zn etc., according to significantly higher ductility and ability of cold deformation [5,6]. The addition of quaternary element to Cu-Al-Mn alloys, improves their properties and meet the standards for application as sensors or actuators, in automotive industry, robotics, aerospace or biomedical sectors [7][8][9]. Sutou and co-authors investigated the influence of Ti, Cr, Co, Fe, Ag, Au, Ni, Zn, Si and Sn on the shape memory effect and pseudoelasticity of Cu-Al-Mn alloys [10].…”

Revisiting Cu-based shape memory alloys: Recent developments and new perspectives

“…The maximum SME value obtained was 4.4% for Nb and Zr contents of 1% and 2%, respectively. More recent studies related to the Cu-Al-Fe-Mn system can be found in the literature [105][106][107].…”

Effect of Valence Electron Concentration in High Entropy Shape Memory Alloys/ Review

“…SMAs such as Cu-based binary and ternary systems (Cu-Zn, Cu-Al, Cu-Zn-Al, Cu-Al-Ni, Cu-Al-Mn), Ni-Ti, and high-temperature shape memory alloys (HTSMA) are usually used in the automotive, aerospace, and medical fields (Baiz, Canbay, & Ozkul, 2018). Furthermore, intelligent materials attract attention in today's technological advances (Canbay, Gudeloglu, & Genc, 2015).…”