Methods of fabricating Cu-Al-Ni shape memory alloys

Agrawal, Ashish; Dube, R. K.

doi:10.1016/j.jallcom.2018.03.390

Cited by 79 publications

(37 citation statements)

References 45 publications

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“…The alloy that was aged at 673 K, has the largest temperature hysteresis, however, its value was decreased by increasing the heat treatment temperature (figure 2(b)). In this study, the chosen heat treatment temperatures are before the eutectoid phase decomposition, which is taking place at 673 K. The eutectoid phase degradation occurs at 838 K [17], thus, it can be concluded that a significant decrease in the value of hysteresis has occurred after the eutectoid transformation took place. In addition, while the value of A p (figure 3(a)) and M p (figure 3(b)) increase gradually with increasing the thermal cycling, in all heat-treated samples these values have diminished.…”

Section: Resultsmentioning

confidence: 99%

Thermal stability and some thermodynamics analysis of heat treated quaternary CuAlNiTa shape memory alloy

Kök

Qader

Mohammed

et al. 2019

Mater. Res. Express

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This study presents the heat treatment effect on a quaternary Cu 79 Al 13 Ni 4 Ta 4 (wt%) shape memory alloy. The induction technique was used for melting the alloy and then four pieces of the alloy were heat-treated at (673 K, 873 K, 1073 K, and 1273 K) for one hour. Some physical parameters were characterized using DSC, XRD, and SEM-EDX. The as-cast and heat-treated samples were studied in terms of phase transformation temperatures, enthalpy change, entropy change, Gibbs free energy, and elastic energy. The transformation temperature was increased by applying heat treatment. Martensitic phase transformation at heat treatment temperature of 1273 K was not observed. Besides, after rising heat treatment temperature, some new phases such as ¡ b ¢ ¢ and 1 1 were specified in XRD patterns and SEM images. Generally, for heat-treated samples, the transformation temperature remains almost constant after the 3rd cycle. However, the thermal stability of the as-cast alloy was not affected through thermal cycling.

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Section: Resultsmentioning

confidence: 99%

Thermal stability and some thermodynamics analysis of heat treated quaternary CuAlNiTa shape memory alloy

Kök

Qader

Mohammed

et al. 2019

Mater. Res. Express

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“…Additionally, the high temperatures of the β-phase for the Cu-Al-Ni alloys have a disordered bcc structure similar to the Cu-Zn-Al alloys [37]. In the Cu-Al-Ni alloys, two types of thermally induced martensites (β′ 1 and γ′ 1 ) form, depending on the alloy's composition and heat treatment [38][39][40][41]. The stability of the β-phase decreases with decreasing temperature.…”

Section: Phase Transformation Morphologymentioning

confidence: 99%

Cu-Based Shape Memory Alloys: Modified Structures and Their Related Properties

Saud¹

2020

Recent Advancements in the Metallurgical Engineering and Electrodeposition

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Cu-Al-Ni shape memory alloys (SMAs) have been developed for hightemperature applications due to their ability to return to pre-deformed shape after heating above the transformation temperature, as well as these alloys have a small hysteresis and high transformation temperature comparing with other shape memory alloys. Adding some of the alloying elements such as Ti, Mn, Be, Zr and B or changing the interior content either Al or Ni by increasing/decreasing may have a significant effect on the phase transitions and enhance the mechanical properties of these alloys. However, the martensite phase transformation is the most important factor, which can be changing the whole properties of Cu-Al-Ni SMAs, where this phase is mainly affected by the alloying elements additions. This chapter reviews the effect of alloying elements on the phase transitions and the enhancement of the mechanical properties of this alloy.

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“…Due to relatively low cost, excellent shape memory effect (SME), and high damping capacity, Cu‐based shape memory alloys (SMAs) are attracting more and more attention. Scholars have conducted extensive and in‐depth researches on them . Nowadays, with the development of industrial civilization, Cu‐based SMAs are being put forward for higher requirements in various fields.…”

Section: Introductionmentioning

confidence: 99%

Effects of Parent Phase Aging and Nb Element on the Microstructure, Martensitic Transformation, and Damping Behaviors of a Cu–Al–Mn Shape Memory Alloy

Wang

Yin

et al. 2020

Physica Status Solidi (a)

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It is recognized that both parent phase aging and element addition can dramatically enhance the comprehensive properties of Cu‐based shape memory alloys (SMAs). However, further in‐depth studies are still needed to clarify the detailed laws and mechanisms. Herein, the effects of parent phase aging and Nb element on the microstructure, martensitic transformation (MT), and damping behaviors of a Cu–Al–Mn SMA are systematically studied. It is found that both the damping at low temperatures and the height of internal friction peak arising from the reverse MT of the Cu–Al–Mn SMA can be improved by the parent phase aging due to the increase in interfacial mobility. When the aging temperature reaches 600 °C, the best damping can be obtained. Nb forms AlNb3 phase in the Cu–Al–Mn matrix. Due to the pinning effect of the AlNb3 phase on grain boundaries, the grains of the Cu–Al–Mn SMA can be remarkably refined. With the increase in Nb content, the damping of the 600 °C aged Cu–Al–Mn SMA increases first and then decreases. The associated mechanisms are discussed. This work aims to provide theoretical basis and technical support for the improvement of damping property of Cu‐based SMAs.

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Methods of fabricating Cu-Al-Ni shape memory alloys

Cited by 79 publications

References 45 publications

Thermal stability and some thermodynamics analysis of heat treated quaternary CuAlNiTa shape memory alloy

Thermal stability and some thermodynamics analysis of heat treated quaternary CuAlNiTa shape memory alloy

Cu-Based Shape Memory Alloys: Modified Structures and Their Related Properties

Effects of Parent Phase Aging and Nb Element on the Microstructure, Martensitic Transformation, and Damping Behaviors of a Cu–Al–Mn Shape Memory Alloy

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