X-ray analysis of some shape memory CuZnAl alloys due to the cooling rate effect

Eskil, Murat; Kayali, N.

doi:10.1016/j.matlet.2005.09.019

Cited by 22 publications

(10 citation statements)

References 11 publications

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“…A few researchers have already pointed out that the quenching medium and, as a consequence, the rate of quenching have a remarkable influence on the shape memory characteristics of the alloy. [35][36][37] Preliminary studies have been carried out so as to understand the effect of different quenching techniques/methods on shape memory transformation behaviour of Cu-Zn-Al system 35,37 while no such study has been reported till date on Cu-Al-Ni-Ti SMAs. It was, therefore, felt necessary to understand the quenching behaviour of Cu-Al-Ni-Ti SMAs prepared via P/M route.…”

Section: Phase Transformation Analysismentioning

confidence: 99%

“…Since the heat transfer during phase transformation is very slow in bulk SMAs, the phase transformation characteristics are more dependent on the cooling rate. Eskil et al 35 have reported that the martensitic transformation and the degree of stabilisation are influenced by quenching conditions in Cu-Zn-Al SMAs. Further, the change in transformation temperatures due to variations in quenching conditions was investigated by Dagdelen et al 36 and Sampath.…”

Section: Introductionmentioning

confidence: 99%

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Influence of quenching methods on martensitic transformation and mechanical properties of P/M processed Cu–Al–Ni–Ti shape memory alloys

et al. 2016

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The effect of quenching conditions on phase transformation characteristics and microstructural features of Cu-Al-Ni-Ti shape memory alloys (SMAs) have been studied. The alloys were synthesised via conventional powder metallurgy process using elemental metal powders. Four different quenching techniques, such as (a) two-step quenching, first to 100°C and then to 0°C; (b) two-step quenching, initially to 40°C and later to 0°C; (c) direct quenching to 40°C and (d) direct quenching to 0°C, were used. The microstructural features and phase transformations that the alloys had undergone were studied using FE-SEM and XRD techniques. The martensitic phase transformation analyses were carried out by differential scanning calorimeter while the mechanical properties were studied by microhardness and flexural bending tests. The results obtained clearly indicate that the quenching routes followed have a remarkable influence on the properties of Cu-based SMAs.

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Section: Phase Transformation Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of quenching methods on martensitic transformation and mechanical properties of P/M processed Cu–Al–Ni–Ti shape memory alloys

et al. 2016

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“…[26] The morphology of the self-accommodating martensite exhibits a plate-like structure, which is also called the lath structure, and has a diamond-shaped morphology that can produce a long, layered structure. [27] There are six types of groups that can be generated in the self-accommodating martensite, and each group contains four variants. When these variant groups are combined, a nearly zero macroscopic morphology change can be generated.…”

Section: A Microstructural Observationsmentioning

confidence: 99%

“…When these variant groups are combined, a nearly zero macroscopic morphology change can be generated. [27,28] The most characteristic feature of the martensitic microstructures in noble metal copper-based ternary alloys such as Cu-ZnAl, Cu-Al-Mn, or Cu-Al-Ni is the prevalence of groups of essentially parallel-sided plates and the occurrence of comparatively a few large groups of unique orientation within the grains of the parent phase. [28] Based on the mechanisms of martensite variants, the alloys have the ability to deform at low stress levels and, moreover, can perform the shape memory effect.…”

Section: A Microstructural Observationsmentioning

confidence: 99%

Effect of Quarterly Element Addition of Cobalt on Phase Transformation Characteristics of Cu-Al-Ni Shape Memory Alloys

Saud

Bakar

Hamzah

et al. 2015

Metall Mater Trans A

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In the current study, a new type of Cu-based shape memory alloys with the function of shape memory effect was successfully produced with the introduction of high-purity Co precipitates between the phases of Cu-Al-Ni shape memory alloy. The microstructure, transformation characteristics, and mechanical properties were systematically investigated by means of differential scanning calorimetry, field emission scanning electron microscopy, energy dispersive spectroscopy (EDS), transmission electron microscopy, X-ray diffraction (XRD), a tensile test, a hardness test, and a shape memory effect test. The typical microstructures show that a new phase was formed, known as the c 2 phase, and the volume friction and the size of this phase were gradually increased with the increasing Co content. According to the results of the XRD and EDS, it was confirmed that the c 2 phase represents a compound of Al 75 Co 22 Ni 3 . However, the presence of c 2 phase in the modified alloys was found to result in an increase of the transformation temperatures in comparison with the unmodified alloy. Nevertheless, it was found that with 1 wt pct of Co addition, a maximum ductility of 7 pct was achieved, corresponding to an increase in the strain recovery by the shape memory effect to 95 pct with respect to the unmodified alloy of 50 pct.

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“…The lattice structure changes in CuZnAl alloys associated with the martensitic transformation are from the crystal structure DO 3 or L2 1 at higher temperature (austenitic phase) to 18R (martensitic phase) at lower temperature. Along with this phase transformation occurs significant changes in mechanical, physical, chemical, electrical and optical properties, including yield stress, elastic modulus, damping, hardness, electrical resistivity, thermal conductivity, thermal expansion and surface roughness [2][3][4][5][6][7][8] . These changes in properties could be exploited in nanoparticles if the martensitic-austenitic transformation occurs.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles from Cu-Zn-Al shape memory alloys physically synthesized by ion milling deposition

et al. 2012

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In this research, an ion milling equipment was used to elaborate nanoparticles from Cu-Zn-Al alloys with shape memory effect. Two different compositions were used, target A: 75.22Cu-17.12Zn-7.66Al at % with an Ms of -9 °C and target B: 76.18Cu-15.84Zn-7.98Al with an Ms of 20 °C. Nanoparticles were characterized by High Resolution Transmission Electron Microscopy, Electron Diffraction and Energy Dispersive X-ray Spectroscopy. The obtained nanoparticles showed a small dispersion, with a size range of 3.2-3.5 nm. Their crystal structure is in good agreement with the bulk martensitic structure of the targets. In this sense, results on morphology, composition and crystal structure have indicated that it is possible to produce nanoparticles of CuZnAl shape memory alloys with martensitic structure in a single process using Ion Milling.

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X-ray analysis of some shape memory CuZnAl alloys due to the cooling rate effect

Cited by 22 publications

References 11 publications

Influence of quenching methods on martensitic transformation and mechanical properties of P/M processed Cu–Al–Ni–Ti shape memory alloys

Influence of quenching methods on martensitic transformation and mechanical properties of P/M processed Cu–Al–Ni–Ti shape memory alloys

Effect of Quarterly Element Addition of Cobalt on Phase Transformation Characteristics of Cu-Al-Ni Shape Memory Alloys

Nanoparticles from Cu-Zn-Al shape memory alloys physically synthesized by ion milling deposition

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