Effect of Ce addition on mechanical properties and shape memory effect of Cu-14%Al-4.5%Ni shape memory alloy (original) (raw)
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This paper aims to study the effect of thermo mechanical treatment in different temperatures of (260 ,280& 300) ◦C on the microstructure and mechanical properties of Cu-14wt%Al-4.5wt%Ni shape memory alloy which prepared by casting method in induction furnace under argon atmosphere. Then thermo –mechanical treatment was performed upon the alloy by applying stress of 190MPa with heating upto 260◦C,280◦C,300◦C, then cooled to room temperature performingstrain recovery measurement. Many tests and inspections such as optical and SEM examinations , DSC Measurement ,XRD inspection , compression and Vickers hardness tests were investigated. The results showed that there is an increase in the transformation temperatures, shape memory limits at 300◦C .It was found that hardnessincreasesandYoung modulusdecreases Also It was found that the thermo-mechanical treatment at 260 ◦C gave better properties , 2%in recovery strain , increase hardness due to the formation of martensitic phase and austenite phase in structure.
Jurnal Teknologi, 2013
Cu-Al-Ni shape memory alloys (SMAs) have been developed for high temperatures engineering components such as sensor and actuators, due to their ability to work at temperatures near 200°C, rather than NiTi and Cu-Zn-Al alloys whose maximum working temperatures around 100°C. These alloys are widely used because they are much cheaper than NiTi/Cu-Zn-Al and do not require any complicated processing during their manufacturing as do for other shape memory alloys. In addition, these alloys have a small hysteresis and high transformation temperatures compared with other alloys. Despite all these advantages, these alloys have their limitations such as brittleness and low phase recovery strains and stress. The present review describes the role of alloying elements on the properties of Cu-Al-Ni shape memory alloys. It has been found that the additions of alloying elements have a significant effect on the formation, morphology, and structure of the obtained martensite, therefore, the properties of these alloys varied in accordance of these effects.
This paper aims to study the effect of Trillium on Thermo-Mechanical characterization by add Te with three different weight percentages (0.3%, 1%, 3%) to a Cu-14%Al-4.5%Ni Shape Memory Alloy which prepared by casting method in vacuum induction furnace. Many tests and inspections such as optical and SEM examinations , DSC Measurement ,XRD inspection , compression and Vickers hardness tests were investigated. The results showed that there is an increase in the transformation temperatures, shape memory limits and anincrease hardness and decrease in Young Modulus Also it was found that at0.3%wt Te gave better SME properties and Mechanical properties Due to the formation of both Austenite phases and martensitic phase and Te particles distribution in martensite matrix of SMA.
Role of alloying additions on the properties of Cu–Al–Mn shape memory alloys
Journal of Alloys and Compounds, 2015
The effect of alloying seven different elements [Zn, Si, Fe, Ni, Mg, Cr and Ti] on the microstructure, hardness, phase precipitation and transformation temperature in a Cu-12.5Al-5Mn alloy with a view to possible improvements as a result of these additions is the focus of the reported study. The base alloy has been chosen keeping in mind its ability to exhibit shape memory properties and improved ductility over other Cu-based SMAs. The objective was to ascertain changes or improvements attained due to the individual tertiary additions.
Journal of Alloys and Compounds, 2009
The transformation temperatures, shape memory effect and superelasticity of Cu-Al-Mn shape memory alloys are highly sensitive to variations in composition. A ternary shape memory alloy Cu-12.5 wt.% Al-5 wt.% Mn was chosen for the present study and different amounts (1, 2 and 3 wt.%) of quaternary elements Zn, Si, Fe, Pb, Ni, Mg, Cr and Ti were added to the ternary (base) alloy. The influence of quaternary additions on shape memory characteristics of these alloys was studied by differential scanning calorimetry, bend and tensile test. Zn and Ni as quaternary additions were found to increase the transformation temperatures, whereas Fe, Cr, Ti, Si and Mg decrease them. These additions were found to increase the extent of strain recovery by shape memory effect, whereas decrease the superelasticity of the alloys.
Materials Science and Engineering: A, 2008
Cu-Al-Mn shape memory alloys with 10-14.5 wt.% of Al and 0-10 wt.% of Mn, were chosen for the present study. The transformation temperatures, shape memory effect and superelasticity of these alloys are highly sensitive to variations in composition. The influence of composition on these properties has been studied by differential scanning calorimetry, bend and tensile test. It is found that with the increase in the amount of aluminum the morphology of martensite and its transformation temperatures change. On the other hand, an increase in the amount of manganese stabilizes martensite and enhances the superelasticity of the alloys.
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, 2017
Shape memory alloys (SMAs) are the category of advanced metallic materials that in the martensitic phase state can sustain strains above its elastic limit but when heated return to their original shape .shape memory alloys in the austenitic phase state exhibits super elasticity and the material recovers its original shape by removal of force. The shape memory effect and transformation temperatures of the rolled specimens were found out by bending test and by DSC. The alloys were investigated for microstructure by optical micrographs to know the martesite variants .The mechanical properties like tensile strength hardness of the sample were evaluated by using UTM and hardness tester respectively as per ASTM standards.
Kemija u industriji
The 8-mm diameter bars of Cu-Al-Mn shape memory alloys were produced by continuous casting technique. The samples were characterised using optical microscopy and scanning electron microscopy along with EDX analysis. The continuous cast alloy revealed some martensitic phase, which, after quenching, led to the microstructure that is completely martensite. Quenching of samples had an effect on several mechanical properties and change in morphology of fracture. After ageing at 200 °C and 300 °C, the tensile strength increased and elongation drastically decreased. Morphology of fracture surface changed from primary ductile to a mixture of intergranular and ductile.
Physica B: Condensed Matter, 2019
A quaternary Cu 80 Al 13 Ni 3 Hf 4 (wt.%) shape memory alloy has been produced from high pure metallic powder through arc-melting method. Then homogenization been performed at 1173K for 24h and followed by a rapid cooling to salt-iced water. As a technique, one hour heat treatment at 773K, 873K, 973K, 1073K, and 1173K, has been done to investigate some physical and structural properties. Some relevant measurements by using DSC, XRD, EDX-SEM, and Vickers hardness devices has been accomplished. While both DSC and XRD results showed that in room temperature all specimens were in austenite phase, but increasing the temperature of heat treatment make changes in the amount of precipitations presented in SEM micro-images, and hence led to a decrease in microhardness values. The sample with 1173K heat treatment was the more stable phase compared to the other specimens, because a minimum values was obtained in calculation of Gibbs free energy and entropy.