An exploratory research of calorimetric and structural shape memory effect characteristics of Cu–Al–Sn alloy

Canbay, Canan Aksu; Karaduman, Oktay; Ünlü, Nihan; Özkul, İskender

doi:10.1016/j.physb.2019.411932

Cited by 18 publications

(13 citation statements)

References 26 publications

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“…Additionally, the average crystallite size (D) parameter of the alloy was found to be 29.32 nm by using D = 0.9λ/B 1/2 cosθ formula of Debye-Scherrer [18,19], where λ is the wavelength (= 0.15406 nm) of the X-ray CuKα radiation, B 1/2 is the full width at half maximum (FWHM) value for the highest peak (= 0.289), and θ is the Bragg angle of this diffraction peak (here, 2θ = 40.569°is for the highest β1′(120) peak). Compared with the others [7,15,18] reported previously, this larger sub-micrometer D crystallite size value of the CuAlBe alloy means that the coherently X-ray scattering domain (spherical or ellipsoidal particle) size of β1′ martensite phase in the alloy is larger and it has a higher single-like crystallinity which is good for shape memory property. Hardness is often inversely related to ductility, so the ductile metals or alloys typically have relatively low hardness.…”

Section: Resultsmentioning

confidence: 52%

“…The values of entropy changes (ΔS A↔M ) caused by these both way transformations that are given in Table 1 were calculated by ΔS A↔M = ΔH A↔M /T 0 relation [7,9]. Here, the equilibrium temperature (T o ) is the temperature where both of the chemical Gibbs free energies of austenite and martensite phases are equalized.…”

Section: Resultsmentioning

confidence: 99%

“…Among these, CuAlBe alloys are of interest in the intermediate and lowtemperature SMA applications. By adding Be content in CuAl-based alloy, the martensitic transformation temperatures and eutectoid point decrease [5] without a change in the concentration [6,7] of the eutectoid point, and this sustains the thermal stability. This also enables alloys to be designed with a wide range of transformation temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Study on Basic Characteristics of CuAlBe Shape Memory Alloy

et al. 2020

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on Basic Characteristics of CuAlBe Shape Memory Alloy

et al. 2020

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“…Specifically, Sn and Al are volatile with low melting temperatures (~500 K and 933 K, respectively), which are ~850 K and ~420 K lower than that of Cu (~1357 K) [43][44][45] . As a result, traditional fabrication of CuAlSn may lead to severe evaporative loss of Sn while attempting to achieve complete melting of Cu 46 . Using our heatconcentrated platform to synthesize the CuAlSn alloy, we observed the co-existence of two major phases (CuAl-rich phase and Sn-rich phase), as shown by SEM and EDS analysis in Fig.…”

Section: Rapid Melt Printing Of Volatile Metalsmentioning

confidence: 99%

Ultrahigh-temperature melt printing of multi-principal element alloys

et al. 2022

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Multi-principal element alloys (MPEA) demonstrate superior synergetic properties compared to single-element predominated traditional alloys. However, the rapid melting and uniform mixing of multi-elements for the fabrication of MPEA structural materials by metallic 3D printing is challenging as it is difficult to achieve both a high temperature and uniform temperature distribution in a sufficient heating source simultaneously. Herein, we report an ultrahigh-temperature melt printing method that can achieve rapid multi-elemental melting and uniform mixing for MPEA fabrication. In a typical fabrication process, multi-elemental metal powders are loaded into a high-temperature column zone that can be heated up to 3000 K via Joule heating, followed by melting on the order of milliseconds and mixing into homogenous alloys, which we attribute to the sufficiently uniform high-temperature heating zone. As proof-of-concept, we successfully fabricated single-phase bulk NiFeCrCo MPEA with uniform grain size. This ultrahigh-temperature rapid melt printing process provides excellent potential toward MPEA 3D printing.

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“…But, Cu-based SMAs have some drawbacks that are tried to be improved such as thermal instabilities, martensite stabilization and brittle nature and weak mechanical properties (low cold workability) stemmed from mainly their microstructural properties such as the large grain sizes, accumulation of secondary phases or impurities along the grain boundaries, high degree of order and also high elastic anisotropy in the β-phase [7,[23][24][25]. A common and simple way to modify microstructure and reduce the grain size for improving these drawbacks and also to change characteristic martensitic transformation temperatures, SME, SE or other properties is to add some ternary, quaternary or more extra additive elements such as Ti, V, Co, Mn, Zr, Ce, Fe, Ni, B, Be, Mg, Sn or C [7,18,19,[22][23][24][26][27][28][29][30][31][32][33][34][35]. SMAs are ultra sensitive to the compositional changes, their properties can change dramatically by even very little changes in the alloying composition.…”

mentioning

confidence: 99%

Novel Quaternary CuAlZnMg High Temperature Shape Memory Alloy (HTSMA) Fabricated by Minor Batch of Zn and Mg Additions

BAŞBAĞ

Karaduman

Özkul

et al. 2023

Turkish Journal of Science and Technology

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Shape memory alloys (SMAs) constitute the second largest commercial smart material class after piezoelectric materials. Different SMA alloy systems or SMAs with miscellaneous functionalities and characteristic properties have been designed for using in different applications until today. High temperature shape memory alloys (HTSMAs) are also widely desired to be used in various smart materials applications. HTSMAs with different functional and characteristic properties are muchly demanded for different tasks to be done by these alloys or devices designed by these alloys. A common and practical way to fabricate SMAs or HTSMAs with different shape memory effect (SME) and other properties is to fabricate them with different alloying compositions and add different additive elements. In this work, a quaternary CuAlZnMg HTSMA with an unprecedented composition consisting minor amount of zinc and magnesium additives was produced by arc melting method. As a result of applying post-homogenization in high β–phase temperature region and immediate quenching, the microstructural mechanism of a SME property was formed in the produced alloy. After then, to examine SME characteristics of the CuAlZnMg alloy some differential thermal analysis (DTA), microstructural (XRD) and magnetization (VSM) characterization tests were carried out. The DTA results showed that the alloy is a HTSMA exhibiting reverse martensitic transformations at temperature range between 167 °C and 489 °C. The XRD pattern obtained at room temperature revealed the martensite phases formed in the alloy, which phases are the base mechanism of the reversible martensitic transformation (the SME property) of the alloy. The VSM test showed the paramagnetic nature of the alloy.

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An exploratory research of calorimetric and structural shape memory effect characteristics of Cu–Al–Sn alloy

Cited by 18 publications

References 26 publications

Study on Basic Characteristics of CuAlBe Shape Memory Alloy

Study on Basic Characteristics of CuAlBe Shape Memory Alloy

Ultrahigh-temperature melt printing of multi-principal element alloys

Novel Quaternary CuAlZnMg High Temperature Shape Memory Alloy (HTSMA) Fabricated by Minor Batch of Zn and Mg Additions

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