The production of copper based shape memory alloys and investigation of the structural, thermal and electrical properties of alloys

In this study, Cu-Al-Mn, Cu-Al-Ni and Cu-Al-Be alloys were produced by melting method. The structures and phase transformations were investigated. In these observations; EDX analysis, differential thermal analysis (DTA), differential scanning calorimetry (DSC), electrical measurements (R-T) were used. The magnetic properties of the alloys were determined by VSM measurements. The element ratios in each alloy were determined by EDX analysis. The structures of the alloys and the planes giving the reflection were determined by X-ray measurements. The order-disorder phase transformations at high temperature region and low temperature region were determined by differential thermal analysis measurements. The variations in the martensit (Ms, Mf) and austenit (As, Af) transformation temperatures according to the concentration (% wt.) of the alloy were determined by differential scanning calorimetry. Besides this, these results were supported with the electrical measurements (R-T). The magnetic properties of the alloys were investigated.As a result of the measurements; T1, T2, T3 and T4 alloys are in martensit structure at room temperature. T5 and T6 alloys consist martensit variants in austenite structure. T7 and B1 alloys are in ordered structure at room temperature. The phase transformations of the T1-T4, T7 and B1 alloys were determined from TG/DTA measurements. The phase transformations of the T5 and T6 alloys weren?t examined. The austenite and martensit transformation temperatures of the T1-T4, T7 and B1 alloys were determined from DSC measurements. The austenite and martensit transformation temperatures of the T5 and T6 alloys weren?t observed. Besides this, the T5 and T6 alloys didn't show a transformation in electrical resistance-temperature (R-T) measurements. But we observed the transformations of the T1-T4, T7 and B1 alloys accomodating with the DSC measurements. As determined from the magnetic measurements,T1, T3, T5, T6 and T7 alloys show typical magnetization.