The effect of Germanium addition on mechanical properties& microstructure of Cu-Al-Ni shape memory alloy (original) (raw)
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Materials Today: Proceedings, 2018
This paper aims to study the effect of 0.3% addition of Ge, Te and Ce on Cu-14%Al-4.5%Ni Shape memory alloys by building a computer model via MATLAB of two direction strain temperature with the calculation of enthalpy(ΔH) and entropy (ΔS) results showed the Ge addition gave the best results in the thermodynamic properties and also in strain ring ,also the use of a mathematical model via MATLAB to calculate the shape memory strain with compared with the actual results , it showed a close ratio with the actual results of the thermo-mechanical testing also results shown an increase in enthalpy entropy and heat flow for all alloy the Ge addition gave the best results as for the hysteresis loops the Ce and Ge Addition gave the best results in general the computer model results and the thermo mechanical showed about 2.7%deffernece in results
Materials Today: Proceedings, 2020
This investigation examines the influences of the (Ce) addition on the mechanical properties and the shape memory effect (SME) of the Cu-based shape memory alloys (SMAs), in which (Ce) is added in three percentages (0.3, 1.0 and 3 wt%) to the base material (Cu-14%Al-4.5%Ni). Different tests and inspections, including X-ray diffraction, compression, HV hardness, and the thermomechanical tests were conducted on the (Ce-modified) alloys. In addition, a differential scanning calorimetry test, microstructure examination via optical measurements, and (SEM) for the whole alloys were performed. Results revealed an increment in the hardness, the yield strength and the maximum strain (e max%) occurred with the increase of the (Ce %) in the base shape memory alloy (with exception of the 3% Ce case). The thermomechanical characteristics depicted an increment in the recovery of strain by as much (98.72%) with a reduction in the modulus of elasticity of martensite and an increment in the modulus of elasticity of austenite. Moreover, the temperatures of transformation shifted to beyond the base shape memory alloy domain (100-170°C), and the modified (SMA) with (3% Ce) exhibited better results than the other materials.