Effects of Annealing Temperature on Thermomechanical Properties of Cu–Al–Ni Shape Memory Alloys

Canbay, Canan Aksu; Karagoz, Zuhal

doi:10.1007/s10765-013-1486-z

Cited by 18 publications

(3 citation statements)

References 20 publications

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“…This confirms that the structure was monoclinic 18R martensite as the a/b ratio was less than √3/2 [35]. This is due to the high temperature of β phase developed into a DO3 structure and then further transformed into 18R martensite structure during rapid cooling process [36].…”

Section: Resultssupporting

confidence: 62%

Study of X-phase formation on Cu-Al-Ni shape memory alloys with Ti addition

Ci¹,

Bakar²,

Hamzah³

et al. 2017

J. MECH. ENG. SCI.

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Cu-based shape memory alloys are used in various applications due to their attractive shape memory effect, easier process and cheaper cost. Cu-Al-Ni SMAs are one of the well-known Cu-based shape memory alloys because of their capability in demonstrating shape memory effect, damping behaviour, and thermoelastic martensitic transformation. In this paper, the effect of Ti addition on the phase transformation temperatures and microstructures of Cu-Al-Ni SMA was investigated. The Cu-Al-Ni alloy specimens were casted with the addition of titanium (Ti) using an induction furnace. Transformation temperature of the alloy was studied by differential scanning calorimetry. The evolution of the phases and microstructures was investigated by using the field emission scanning electron microscopy corresponding with energy dispersive spectroscopy and X-ray diffraction. It was found that the addition of Ti in the Cu-Al-Ni SMAs has increased the transformation temperatures. The results revealed that the addition of Ti led to the formation of a new phase into the microstructure known as X-phase. From the XRD result, it was indicated that the X-phase was AlNi2Ti and Cu3Ti compounds. It was also found that the alloy with 0.7wt% Ti has produced the most effective outcome of the transformation temperature (Ms: 233.16°C, Mf: 225.67°C, As: 229.85°C, Af: 239.25°C) due to the presence of X-phase in the microstructure. Further study will be carried out to investigate the application of this material and focus on the application of the material in damping application.

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Section: Resultssupporting

confidence: 62%

Study of X-phase formation on Cu-Al-Ni shape memory alloys with Ti addition

Ci¹,

Bakar²,

Hamzah³

et al. 2017

J. MECH. ENG. SCI.

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“…For both the direct and reverse transformations, the entropy change can be calculated from the following equations [29,30]: …”

Section: Structural Propertiesmentioning

confidence: 99%

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

2015

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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.

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“…Therefore, Cu-based SMAs have attracted attention not only as a low-cost alternative to the mechanical applications of nitinol but also for other applications with their superior electrical and thermal conductivity and the possibility of increasing resistance [6,7]. In Cu-based alloys, the shape memory effect is strongly dependent on thermal treatments, mechanical effects, and element ratios in the structure and production methods [8][9][10][11][12][13]. Another property of Cu-based SMAs is superelasticity, which allows for high elastic deformations of up to 14%, making them suitable for storage and dissipation of mechanical energy [1,14,15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal Properties of Cu-based Shape Memory Alloy

Turan¹

2023

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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This study aims to investigate the thermal properties of the phase transformation that may occur with the effect of temperature in Cu-14.70wt.%Al-4.72wt.%Ni shape memory alloy. The sample was annealed at 1203 K for 30 min in an argon atmosphere and then cooled rapidly in salt-ice water. By using Differential Scanning Calorimetry (DSC), the martensitic phase transformation parameters of the sample were found. The activation energy required for these transformations was calculated using the Kissinger, Augis-Bennett, and Takhor methods. Thermogravimetric Analysis (TGA) measurements investigated the mass changes that may occur with the effect of temperature. Surface morphology was analyzed using an optical micrograph.

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Effects of Annealing Temperature on Thermomechanical Properties of Cu–Al–Ni Shape Memory Alloys

Cited by 18 publications

References 20 publications

Study of X-phase formation on Cu-Al-Ni shape memory alloys with Ti addition

Study of X-phase formation on Cu-Al-Ni shape memory alloys with Ti addition

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

Investigation of the Thermal Properties of Cu-based Shape Memory Alloy

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