Reversible martensite transformations in thermal cycled polycrystalline Cu-13.7%Al-4.0%Ni alloy

Pereira, Elaine Cristina; Matlakhova, Lioudmila Aleksandrovna; Matlakhov, Anatoly N.; Araújo, Carlos José de; Shigue, C.Y.; Monteiro, Sérgio Neves

doi:10.1016/j.jallcom.2016.07.210

Cited by 18 publications

(15 citation statements)

References 25 publications

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“…3c, 3d, 4c, and 4d) reveal a different type of martensite plate characteristic for γ 1 ' martensite. According to the literature, 6,22 the fine needles and V-shaped laths are typical morphologies of β' 1 and γ' 1 martensites, respectively. Alloys with aluminium content of 11-13 wt.…”

Section: Results Of Thermodynamic Calculation Of Cu-al-ni Ternary Phamentioning

confidence: 97%

The influence of heat treatment on microstructure and phase transformation Temperatures of Cu-Al-Ni shape memory alloy

et al. 2019

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This paper presents the results of thermal and microstructural analysis of Cu-Al-Ni shape memory alloy before and after heat treatment. After casting, a bar of Cu-12.8 Al-4.1 Ni (wt.%) alloy, obtained by the vertical continuous casting technique, was subjected to a certain heat treatment procedure. Solution annealing was performed at 850 °C for 60 min, followed by water quenching. Tempering was then performed at four different temperatures (150 °C, 200 °C, 250 °C and 300 °C). The microstructural results were obtained by optical and scanning electron microscopy. Thermodynamic calculation of ternary Cu-Al-Ni system under equilibrium was performed using Thermo-Calc 5 software. Phase transformation temperatures were determined by differential scanning calorimetry (DSC). The DSC results show the highest values of transformation temperatures in as-cast state. After solution annealing and tempering, the transformation temperatures show lower values with exceptional stability of Ms temperature (martensite start temperature).

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Section: Results Of Thermodynamic Calculation Of Cu-al-ni Ternary Phamentioning

confidence: 97%

The influence of heat treatment on microstructure and phase transformation Temperatures of Cu-Al-Ni shape memory alloy

et al. 2019

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“…The chosen loads were below the flow limit determined as 70 MPa for this alloy [18,21]. The load was applied along with thermocycling using the special device developed for this purpose [18][19][20][21][22]. After TCTL, the structure of the alloy was analyzed by optical metallography and X-ray diffraction.…”

Section: Methodsmentioning

confidence: 99%

Physical and Structural Characterization of Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Submitted to Thermo-Cyclical Treatments under Applied Loads

Matlakhova

Pereira

Pul’nev

et al. 2020

Metals

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Monocrystalline alloy with a nominal composition of Cu-13.7% Al-4.2% Ni (wt.%) that shows reversible martensitic transformations (RMTs) was studied. The alloy, manufactured by the “Memory Crystals Group” in Russia, was subjected to thermo-cyclical treatment (TCT) under tension within a range that included critical RMT temperatures. A special device was developed to perform TCTs (up to 500 cycles) and three different loads were applied: 0.11, 0.26, and 0.53 MPa. X-ray diffraction analysis, optical microscopy, differential calorimetry, and Vickers microhardness were involved in the alloy’s characterization. Under TCTs, the alloy displayed complex structural transformation, revealing the sequence of RMT, β1 ↔ R ↔ β′1 + γ′1; the involved phases were coherently precipitated but very sensitive to the experimental conditions. It was found that during TCTs (from 300 cycles) performed under optimum load (0.26 MPa), the processes of martensite reorientation, hardening, and stabilization of the structure were the most intensive thus leading to a reduction of RMT critical intervals and increased microhardness.

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“…6b) bronzes, both annealed and quenched. The identification of the XRD peaks was performed based on the literature values for Cu-Al-Ni SMA 3,12 . In Figure 6(a) for the three alloys, the XRD revealed the presence of the α phase (Cu 4 Al) with DO 3 ordering and other peaks that were not identifiable.…”

Section: Verification Of Phase Transformation By Differential Scanninmentioning

confidence: 99%

“…The nickel acts to retard the diffusion of aluminum in annealed Cu-Al alloys, eliminating the stable γ 2 phase that does not undergo the martensitic transformation. It is also known that the transformation temperatures of these alloys are sensitive to their chemical composition [1][2][3][4] . For the Cu-XAl-4Ni alloys (% wt), it has been observed that the transformation temperatures abruptly decrease with a slight increase in Al content (X) 1,5 ; depending on the Al content, different martensites can be formed, denoted as γ 1 ' or β 1 ' 3,6 .…”

Section: Introductionmentioning

confidence: 99%

“…It is also known that the transformation temperatures of these alloys are sensitive to their chemical composition [1][2][3][4] . For the Cu-XAl-4Ni alloys (% wt), it has been observed that the transformation temperatures abruptly decrease with a slight increase in Al content (X) 1,5 ; depending on the Al content, different martensites can be formed, denoted as γ 1 ' or β 1 ' 3,6 . Copper-based SMA have steadily attracted the attention of researchers during recent decades due to their low cost and ease of manufacturing when compared with TiNi -based alloys 1,4 .…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Compositional Modification of Commercial Aluminum Bronzes to Obtain Functional Shape Memory Properties

2017

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In copper-based shape memory alloys (SMAs), some exceptional phenomena, such as the shape memory effect (SME) or superelasticity (SE), are observable. However, commercial aluminum bronzes, Cu 3 Al-based alloys, do not present these functional properties (SME and/or SE) in their original state. Thus, since one of the main copper-based SMA systems is the Cu-Al-Ni alloy, this paper aims to analyze the modification of these commercial aluminum bronzes to SMA by the addition small amounts of Cu, Al and/or Ni. These modified bronzes were reprocessed by induction melting and injected by centrifugation into a ceramic coating mold. The modifications were made to determine the nominal composition for a Cu-13,0Al-4,0Ni (%wt) SMA. The effectiveness of the modifications was verified by differential scanning calorimetry (DSC) thermal analysis. All modified Cu-Al-Ni bronzes presented DSC peaks of the thermoelastic martensitic phase transformation, showing that SMA behavior was achieved, while the non-modified bronzes revealed no transformation. These results were supported by Vickers hardness (HV), X-ray diffraction (XRD), semi quantitative composition by EDS analysis and optical microscopy.

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Reversible martensite transformations in thermal cycled polycrystalline Cu-13.7%Al-4.0%Ni alloy

Cited by 18 publications

References 25 publications

The influence of heat treatment on microstructure and phase transformation Temperatures of Cu-Al-Ni shape memory alloy

The influence of heat treatment on microstructure and phase transformation Temperatures of Cu-Al-Ni shape memory alloy

Physical and Structural Characterization of Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Submitted to Thermo-Cyclical Treatments under Applied Loads

Analysis of Compositional Modification of Commercial Aluminum Bronzes to Obtain Functional Shape Memory Properties

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