Electrochemical and microstructural study of Cu–Al–Ni shape memory alloy

Gojić, Mirko; Vrsalović, Ladislav; Kožuh, Stjepan; Kneissl, Albert C.; Anžel, Ivan; Gudić, Senka; Kosec, Borut; Kliškić, Maja

doi:10.1016/j.jallcom.2011.07.107

Cited by 55 publications

(36 citation statements)

References 36 publications

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“…The composition interval for its occurrence was found to be: aluminum with 13.0 to 15 wt.% and nickel with 3.0 to 4.5 wt.% 16,21,25,43 . This behavior, which likewise could be interpreted as pseudoplastic 45 , has long been found in other alloy systems such as Ti-Ni, Cu-Zn and Cu-Zn-Al [50][51][52][53] . The RMT is associated with fundamental effects currently used in many practical applications ranging from biomedical implants to aerospace devices [54][55][56][57][58][59] .…”

Section: Introductionmentioning

confidence: 54%

“…The basic motivation behind this investigation was the fact that a CuAlNi alloy, as SMA, is recognized to have significant advantages over the more commonly used Ti-Ni (Nitinol) alloys. In terms of processing, CuAlNi alloys display less melting and casting difficulty, which allows for more precise composition control 37,43,45,56 . Moreover, they have higher stiffness and superior thermal and electrical conductivities 37 .…”

Section: Introductionmentioning

confidence: 99%

“…Despite the lack of biocompatibility, which is a relevant biomedical advantage of Nitinol, CuAlNi components are not only less expensive but also easy to machine, and do not oxidize as readily as titanium based components. Consequently, they represent a viable SMA alternative for non-medical actuator devices 45 .…”

Section: Introductionmentioning

confidence: 99%

“…This so called intermediate or R martensite is coherent with β 1 as well as with the martensites β´1 and γ´1 44 . Several works have been dedicated to polycrystalline CuAlNi SMAs 2,[4][5][6][7][8][12][13][14][15]34,41,43,45,47,49 , yet, most fundamental works are devoted to single crystals. However, practical applications might require polycrystalline SMA components [57][58][59] .…”

Section: Introductionmentioning

confidence: 99%

“…However, practical applications might require polycrystalline SMA components [57][58][59] . In these cases, depending on the alloy composition, processing condition and initial grain size as well as thermal and/or mechanical treatment, different RMT parameters related to microstructure and properties are obtained 41,43,45,[47][48][49] . In particular, Sari and Kirindi 41 investigated the microstructure and compression properties of a Cu-11.92 wt.%Al-3.78 wt.%Ni alloy produced by arc-melting.…”

Section: Introductionmentioning

confidence: 99%

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Martensitic Transformation Under Compression of a Plasma Processed Polycrystalline Shape Memory CuAlNi Alloy

et al. 2017

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Shape memory alloys (SMA) are attracting considerable attention owing to possible applications from biomedical to aerospace. In particular, CuAlNi alloys present significant advantages associated with low cost, easy processing and superior thermo-electric conductivity over other SMAs such as the NiTi alloys. Characterization of some properties and structural changes caused by martensitic transformation are still open to investigation. The present work evaluated these characteristics in an as-cast plasma processed shape memory Cu-14wt.%Al4wt.%Ni, which was compression tested until fracture. Experimental results showed that an as-cast ingot presents not only chemical and phase homogeneity, but also microstructures composed of grains with martensitic morphology. Martensites β' 1 and γ' 1 , as well as intermediary martensitic R and high temperature β 1 were identified by X-ray diffraction tests. It was found that the compressive deformation does not interfere in the phase composition and martensite morphology. However, compression changes the volumetric fractions and crystallographic orientation of the martensites. The mechanical behavior is characterized by an apparent elastic response until the fracture. The fractured surface exhibits brittle aspect like "river patterns" and evidence of intergranular rupture.

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Section: Introductionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Martensitic Transformation Under Compression of a Plasma Processed Polycrystalline Shape Memory CuAlNi Alloy

et al. 2017

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Microstructure and corrosion behaviour of Cu-Al-Ni shape memory alloys with Ag nanoparticles

Saud

Hamzah

Abubakar

et al. 2014

Materials and Corrosion

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In this study, the effect of silver nanoparticles on the transformation temperatures, microstructural and corrosion characteristics of the ternary Cu-Al-Ni shape memory alloys (SMA) was investigated. It was subsequently observed that the addition of Ag nanoparticles controlled the phase morphology and orientations of the parent phases, along with the formation of the Ag-rich precipitates. Furthermore, it was shown that the addition of Ag nanoparticles can affect the martensitic transformation temperature, due to the microstructure changes that are associated with the formation of intermetallic compounds and/or precipitates. The corrosion behaviour of the Cu-Al-Ni shape memory alloy with and without nano-Ag addition were investigated using electrochemical tests in a NaCl solution, and their results showed that the corrosion potential of Cu-Al-Ni-Ag (nanoparticles) SMA (À277.1 mV SCE ) was nobler than the Cu-Al-Ni SMA. It was also shown that there is a decline in corrosion current density from 6.93 to 5.61 µA/cm 2 after the addition of nano-Ag to Cu-Al-Ni SMA. The combination of SEM, together with EDX and XRD, also showed that the formation of the corrosion products silver chloride, cuprous oxide, aluminium oxide/hydroxide and silver oxide act as a protective layer and improve the corrosion resistance of Cu-Al-Ni-Ag SMA.

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Corrosion behavior of two Cu‐based shape memory alloys in NaCl solution: An electrochemical study

Spotorno,

Fracchia,

Krancher

et al. 2024

Materials & Corrosion

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The corrosion behavior of two different Cu–Al–Mn–Ni alloys, pseudoelastic and pseudoplastic, was studied in a 0.6 M sodium chloride aqueous solution by monitoring the open circuit potential for 100 h and characterizing the resulting corrosion products. Electrochemical impedance spectroscopy analysis detected three processes related to the electrochemical double layer, a passive film and a diffusive contribution associated with the dissolution/precipitation of corrosion products. Potentiodynamic scans revealed a cathodically controlled corrosion mechanism and the presence of active–passive behavior at anodic potentials for both alloys studied. Polarization of the samples at selected potentials in the anodic branch allowed the investigation of the reactions involved, highlighting an improved corrosion resistance of the pseudoelastic alloy. The corrosion rates of the pseudoelastic and pseudoplastic alloys, after 100 h of immersion, were determined to be 0.007 and 0.011 mmpy, respectively. The post‐experiment characterization was carried out by means of scanning electron microscopy, micro‐Raman spectroscopy and X‐ray diffraction, supporting the electrochemical results.

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Electrochemical and microstructural study of Cu–Al–Ni shape memory alloy

Cited by 55 publications

References 36 publications

Martensitic Transformation Under Compression of a Plasma Processed Polycrystalline Shape Memory CuAlNi Alloy

Martensitic Transformation Under Compression of a Plasma Processed Polycrystalline Shape Memory CuAlNi Alloy

Microstructure and corrosion behaviour of Cu-Al-Ni shape memory alloys with Ag nanoparticles

Corrosion behavior of two Cu‐based shape memory alloys in NaCl solution: An electrochemical study

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