The effect of quaternary element on the thermodynamic parameters and structure of CuAlMn shape memory alloys

Canbay, Canan Aksu; Karagoz, Zuhal

doi:10.1007/s00339-013-7880-3

Cited by 18 publications

(6 citation statements)

References 18 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: 74%

“…According to [11] and [12], Cu-Al-Mn SMAs exhibit more ductility due to their parent phase with an L2 1 structure that shows a low degree of order with a low Al concentration of less than 18 at%. The improvement of the mechanical properties of these Cu-based ternary systems for technological and industrial applications, and quaternary elements such as Ti, Co, Zr, B, Fe, or Cr can be added into the main phase [13][14][15]. The disordered β-phase is stable at high temperatures for the Cu-Al-Mn SMAs, and this disordered β-phase transforms into the β(A2) → β 2 (B2) → β 1 (L21) ordered phase during a quenching period.…”

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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: 74%

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confidence: 99%

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

2015

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“…In recent years, many studies have been carried out in order to improve the properties of Cu-Al-Mn systems by adding other elements such as Ni, Ti, Mg, Fe [6,7].…”

Section: Introductionmentioning

confidence: 99%

The effect of silver addition on microstructure and thermal properties of the Cu–10%Al–8%Mn shape memory alloy

et al. 2017

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The influence of Ag addition on microstructure and thermal properties of the Cu-10%Al–8%Mn alloy was investigated in this work. Two alloys with designed compositions Cu-10%Al–8%Mn and Cu-10%Al–8%Mn-4%Ag (in wt.%) were prepared by induction melting of pure metals. Microstructures of the prepared samples were investigated in the as-cast state, after homogenization annealing and after quenching. The effects of different methods of heat treatment on the microstructure and transformation temperatures of the investigated Cu-10%Al–8%Mn and Cu-10%Al–8%Mn-4%Ag alloys were investigated using SEM-EDS and DSC techniques.It was determined that after induction melting microstructure of the both investigated alloys are primarily composed of martensite and a small amount of α-phase precipitates.Fully martensitic structure in both investigated alloys was obtained after direct quenching from the 850 °C into the ice water. Based on the DSC cooling curves it was determined that two-step martensite transformation for the both investigated alloys occur in the temperature interval from about 30 to -40 °C.

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“…Additions of alloying elements to the Cu-Al-Mn system can also modify the phase stability and some properties such as magnetization and microhardness. Literature data show that the addition of Mg to Cu-Al-Mn alloys shifts the martensitic transformation temperature to higher values, while addition of Fe shifts it to lower values [11]. The addition of Ce enhances the tensile strength and the ductility of Cu-Al-Mn alloys [12], but there is little information about the effect of Ag additions.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Cu–18.84 at.%Al–10.28 at.%Mn–1.57 at.%Ag alloy after slow cooling from high temperatures

Silva

Paganotti

Adorno

et al. 2015

J Therm Anal Calorim

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The characteristics of the Cu-18.84 at.%Al-10.28 at.%Mn-1.57 at.%Ag alloy after slow cooling from high temperatures were studied using optical and scanning electron microscopies, microhardness measurements with temperature, differential scanning calorimetry, X-ray diffraction, magnetic moment changes with temperature and applied field. The results indicated the presence of a new transition associated with dissolution of the Ag-rich phase. It was also verified that the content of Al strongly interferes with the magnetization of the Cu-18.84 at.%Al-10.28 at.%Mn-1.57 at.%Ag alloy, since at lower Al concentration the relative fraction of the ferromagnetic L2 1-(Cu 2 AlMn) phase is decreased.

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The effect of quaternary element on the thermodynamic parameters and structure of CuAlMn shape memory alloys

Cited by 18 publications

References 18 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

The effect of silver addition on microstructure and thermal properties of the Cu–10%Al–8%Mn shape memory alloy

Characteristics of the Cu–18.84 at.%Al–10.28 at.%Mn–1.57 at.%Ag alloy after slow cooling from high temperatures

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