Relationship between transformation temperatures and alloying elements in Cu–Al–Ni shape memory alloys

Karagoz, Zuhal; Canbay, Canan Aksu

doi:10.1007/s10973-013-3145-9

Cited by 41 publications

(16 citation statements)

References 22 publications

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“…4. The enthalpy and entropy variations of each sample behaved in the same way, and these results obtained from the thermal analysis were in compliance with the literature results [14,[24][25][26]. The activation energy is important to determine the crystallization behavior and also to evaluate the required energy during the direct and reverse transformations.…”

Section: Structural Propertiessupporting

confidence: 82%

“…The chemical compositions of the Cu, Al, Mn, and Fe in the fabricated alloys were determined by Bruker Model energy dispersive X-ray analysis, and the determined chemical compositions of the alloys are given in Table 1. The characteristic thermoelastic martensitic transformation behaviors were determined by Shimadzu DSC-60A differential scanning calorimetry under an inert nitrogen atmosphere at a flow rate of 50 mL with running temperature ranges of (5,15,25,35, and 45) • C·min −1 . In the XRD investigations on the samples using CuK α , the radiation was provided by a Rigaku RadB-DMAX II diffractometer at room temperature between 30 • C and 80 • C. …”

Section: Methodsmentioning

confidence: 99%

“…The total area under the curve was expressed as the value of the enthalpy ( H ), while the value of the entropy was equal to the value of enthalpy changes divided by the equilibrium temperature. The argumentation of Salzbnenner and Cohen was used to determine the value of the T 0 equilibrium temperature between the martensite and austenite phases by the following equation [24][25][26][27][28]:…”

Section: Structural Propertiesmentioning

confidence: 99%

“…DSC curves of the alloys at a heating rate of 25 • C·min −13.2 Thermal AnalysisThe calorimetric investigations of the samples were performed at different heating rates(5,15,25, 35, and 45) • C·min −1 , and the DSC curves are displayed inFig. 2.…”

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confidence: 99%

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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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Section: Structural Propertiessupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Structural Propertiesmentioning

confidence: 99%

mentioning

confidence: 99%

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

2015

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“…The DSC thermal analysis is one of the essential characterizations in the field of SMA because it gives the specific phase transition temperatures in the stress-free condition [25][26][27][28]. In this paper, DSC was also used to have information about the chemical composition and the thermo-mechanical history of all the samples.…”

Section: Introductionmentioning

confidence: 99%

DSC and three-point bending test for the study of the thermo-mechanical history of NiTi and NiTi-based orthodontic archwires

Nespoli

Villa

Bergo

et al. 2015

J Therm Anal Calorim

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It is a known fact that the NiTi orthodontic archwire is one of the first and most diffuse biomedical applications of shape memory alloys. In the last years, none deep study about orthodontic archwires has been conducted from the material point of view. In general, the clinical response is the principal aspect that has been investigated for this application. Nonetheless, the accurate mechanical and physical characterization of the archwires can be very important to add new developments to this biomedical product and to give a substantial contribution to the indispensable evolution that is crucial for better clinic results. In fact, the principal aspect that it is needed for further improvements is the study of the optimal force that does not cause damage to the surrounding tissues. According to this statement, a deep study about the thermomechanical characterization of several pseudoelastic commercial archwires used in the straight-wire low-friction techniques is presented. In detail, flexural mechanical tests in the three-point-bending configuration were conducted to assess the archwires unloading force, while differential scanning calorimetry was used to study the phase transition temperatures, and the thermo-mechanical history of each specimen. Both NiTi and NiTiCu commercial archwires were tested, and different geometries were considered. For all the archwires, an excellent repeatability of the results has been found. This series of characterizations provides a complete view of the thermo-mechanical properties of the material, and therefore it shows the possibility to modulate the functional properties developed by the device as a function of the biological field.

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The Influence of Sintering Parameters in the Microstructure and Mechanical Properties of a Cu–Al–Ni–Mn–Zr Shape Memory Alloy

Gera¹,

Soyama

Cava

et al. 2018

Adv Eng Mater

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Shape memory alloys from the Cu–Al–Ni system arouse interest for industrial applications due to their high thermal stability and low cost. In this study, the Cu–11.8Al–3.2Ni–3Mn–0.5Zr alloy is prepared through a powder metallurgy processing technique. Specimens are produced by a conventional uniaxial press followed by sintering procedure under argon atmosphere. The sintering temperature is varied in the range from 950 to 1060 °C, whereas sintering time is varied from 0.5 to 2 h. The results denote that a temperature close to the alloy's solidus temperature is necessary to achieve higher densities. Moreover, martensite‐type microstructures are observed, despite the slow cooling rate applied after sintering. The compression strengths are in the order of 500 MPa with the exception of the specimens sintered for 1.5 h, which reaches an average of 700 MPa. This is explained by the lower porosity resulting from liquid phase sintering. The forward and reverse martensitic transformation temperatures, however, are quite similar for all examined conditions.

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Relationship between transformation temperatures and alloying elements in Cu–Al–Ni shape memory alloys

Cited by 41 publications

References 22 publications

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

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

DSC and three-point bending test for the study of the thermo-mechanical history of NiTi and NiTi-based orthodontic archwires

The Influence of Sintering Parameters in the Microstructure and Mechanical Properties of a Cu–Al–Ni–Mn–Zr Shape Memory Alloy

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