Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys

Koeda, N.; Omori, Toshihiro; Sutou, Yuji; Suzuki, Hisao; Wakita, Masami; Kainuma, Ryosuke; Ishida, K.

doi:10.2320/matertrans.46.118

Cited by 37 publications

(23 citation statements)

References 11 publications

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“…Araya et al [15] showed that in Cu-Al-Be wires with D = 0.5 mm, ∆E/E remains nearly constant when d decreases from ~300 to ~100 μm, but starts to decline below this point. A similar size effect is observed in Cu-Al-Mn sheets [20] and wires [21], where  tan decreases with decreasing d/D. Such decrease in damping at smaller d/D is attributed to three-dimensional grain constraint [20,21].…”

Section: Introductionsupporting

confidence: 58%

Size effects in shape memory alloy microwires

2011

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In shape memory alloys, the reversible phase transformations between austenite and martensite give rise to superelasticity and shape memory properties. Here we systematically study the sample size dependence of these properties and the associated transformations in polycrystalline shape memory alloy microwires with a bamboo grain structure, i.e., where the wire diameter is completely spanned by individual grains. Cu-Al-Ni wires with diameters ranging from ~500 down to ~20 microns are fabricated by the Taylor liquid processing technique, and are characterized by both isothermal uniaxial tensile testing and mechanically-constrained thermal cycling. We observe size effects in both the transformation stresses and temperatures. What is more, we find that the stress hysteresis in a mechanical cycle, and the temperature hysteresis in a thermal cycle, both increase with decreasing wire diameter, particularly for wires smaller than 100 microns. A direct consequence of the increased hysteresis is enhanced energy dissipation (i.e., damping capacity) in smaller wires. We also discuss possible physical origins of the observed size effects, including interface and surface energies, stored elastic energy, heat transfer, and internal friction.

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Section: Introductionsupporting

confidence: 58%

Size effects in shape memory alloy microwires

2011

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“…It has also been applied in the development of flexible glass frames, bra under wires, and many biomedical applications as a result of their DOI good corrosion resistance and biocompatibility [6]. The high damping capacity of SMAs has made them suitable for applications where reduced noises and vibrations are required [7]. Thus considering the current areas of application of SMAs and its potential for wider use, it is expected that studies on how to improve their overall material properties will remain of interest in the years ahead.…”

Section: Introductionmentioning

confidence: 99%

MECHANICAL AND CORROSION BEHAVIOUR OF IRON MODIFIED Cu-Zn-Al ALLOYS

Alaneme

Sulaimon²,

Olubambi³

2013

Acta Metall Slovaca

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The mechanical and corrosion behaviour of iron modified Cu-Zn-Al alloys has been investigated. Cu-Zn-Al alloys containing 20 and 25 wt. % Zn was produced by casting method with and without the addition of 0.1wt. % iron. The alloys were subjected to a homogenizationcold rolling-annealing treatment schedule, before the alloys were machined to specifications for tensile test, fracture toughness, hardness measurement, corrosion test and microstructural analysis. From the test results, it was observed that the structures of the Cu-Zn-Al alloys were modified by iron addition with near equi-axed grain morphologies developed. There was no significant difference in the hardness of the iron modified and the unmodified Cu-Zn-Al alloys, but the tensile strength, strain to fracture, and fracture toughness of the alloys improved with iron addition. The Cu-Zn-Al alloys also exhibited good corrosion resistance in 3.5 wt. % NaCl and 0.3M H 2 SO 4 solutions. It was however observed that irrespective of iron addition, the mechanical properties and corrosion resistance of the Cu-20Zn-4Al-xFe alloy compositions where better in comparison with the Cu-25Zn-4Al-xFe alloy grades (where x=0,0.1wt. %).

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“…The trigger for wide research of Cu-Al-Mn alloys in recent years is their easy manufacturing, low cost as well as good properties, especially electric properties and thermal conductivity. The special emphasis of investigations are Cu-Al-Mn shape memory alloys (SMA), that shows unique properties of remembering their shape as well as recovering to original shape under temperature changes or plastic deformation [1][2][3][4]. Cu-Al-Mn alloys display advantage in technological applications over other Cu-based SMA alloys, such as Cu-Al-Ni, Cu-Al-Zn etc., according to significantly higher ductility and ability of cold deformation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and microstructure study of the as-cast Cu-rich Cu-Al-Mn ternary alloys

Holjevac-Grgurić

Manasijević

Kožuh

et al. 2017

J min metall B Metall

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Four Cu-rich alloys from the ternary Cu-Al-Mn system were prepared in the electric-arc furnace and casted in cylindrical moulds with dimensions: =8 mm and length 12 mm. Microstructural investigations of the prepared samples were performed by using optical microscopy (OM) and scanning electron microscopy, equipped by energy dispersive spectroscopy (SEM-EDS). Assignation of crystalline phases was confirmed by XRD analysis. Phase transition temperatures were determined using simultaneous thermal analyzer STA DSC/TG. Phase equilibria calculation of the ternary Cu-Al-Mn system was performed using optimized thermodynamic parameters from literature. Microstructure and phase transitions of the prepared as-cast alloys were investigated and experimental results were compared with the results of thermodynamic calculations.

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Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys

Cited by 37 publications

References 11 publications

Size effects in shape memory alloy microwires

Size effects in shape memory alloy microwires

MECHANICAL AND CORROSION BEHAVIOUR OF IRON MODIFIED Cu-Zn-Al ALLOYS

Phase transformation and microstructure study of the as-cast Cu-rich Cu-Al-Mn ternary alloys

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