Two-Step Martensitic Transformation in an Aged Ti50Ni15Pd25Cu10High Temperature Shape Memory Alloys

Rehman, Saif Ur; Khan, Mushtaq; Khan, Ashfaq; Ali, Liaqat; Jaffery, Syed Husain Imran

doi:10.12693/aphyspola.128.b-125

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…NiTi alloys are another important group of shape memory materials [13]. Shape memory effect can be described as material ability to change its shape upon heating.…”

Section: Introductionmentioning

confidence: 99%

A Cyclic Voltammetry Study on Electrodeposition of Cu-Zn Alloy Films: Effect of Ultrasonication Time

Yurdal

Karahan

2017

Acta Phys. Pol. A

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Copper zinc alloys were electrodeposited in the form of thin films. Electrodeposition process was carried out in non-cyanide aqueous medium, under constant current. Effect of pre-deposition ultrasonication of solution was investigated. In other words ultrasonic treatment was applied only before the electrodeposition. Solutions were subjected to high-energy ultrasonication for increasing times. Cyclic voltammetry was used to understand changes occurring due to duration of ultrasonication. No ultrasonication was applied during deposition. Atomic composition of resultant films were revealed by MP-AES. It was found that implementation of ultrasonic treatment before electrodeposition affects CV characteristics, when compared to non-ultrasonicated solution. Atomic composition of fabricated samples were found to be close to each other, some of them showing more deviation.

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“…NiTi alloys are another important group of shape memory materials [13]. Shape memory effect can be described as material ability to change its shape upon heating.…”

Section: Introductionmentioning

confidence: 99%

A Cyclic Voltammetry Study on Electrodeposition of Cu-Zn Alloy Films: Effect of Ultrasonication Time

Yurdal

Karahan

2017

Acta Phys. Pol. A

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“…Some other materials also show shape memory effect, including NiTi [13]. Under certain conditions shape memory materials can change shape by cooling as well, and can make cycles between different shapes [14], which brings possibility for them to be used in actuator applications, with high actuation forces.…”

Section: Introductionmentioning

confidence: 99%

Phase Formation in Electrodeposited Cu-Zn Alloy Films Produced from Ultrasonicated Solutions

Yurdal

Karahan

2017

Acta Phys. Pol. A

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Thin film brass alloys were galvanostatically electrodeposited from non-cyanide citrate solutions. Aqueous sulphate solutions were used as deposition medium. It was aimed to understand the effect of ultrasonication of the solutions before electrodeposition process. Ultrasonication was not applied during deposition. This method was utilized to change solution characteristics, by applying high energy via cavitation mechanism, which would result in changes in resultant film properties. X-ray diffraction technique was used to investigate phase formation in samples. Moreover X-ray diffractograms were also used to calculate grain size values. Cu and Zn elements were codeposited successfully to form brass alloys. When phase formations in the samples were compared to each other, it was concluded that although there are small differences between X-ray diffractograms of samples, ultrasonic treatment before electrodeposition is not an effective way to alter phase characteristics of CuZn alloy samples, since all samples have shown similar X-ray diffraction graphs. Grain size is found to get smaller with presence of ultrasonication, extending ultrasonication time caused only small random changes in grain size.

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Effect of Citrate-Based Bath pH on Properties of Electrodeposited Cu–Zn Coating on an Aluminum Substrate

Özdemİr,

Ünal,

Karahan

2024

Metall Mater Trans A

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In this study, Cu–Zn alloys were deposited in citrate-based electrolytes on aluminum substrate by electrodeposition method. The effect of bath pH variation on the properties of the obtained Cu–Zn alloy coatings was investigated. The electrochemical behavior of the citrate-based baths and the crystalline structure, surface morphology and elemental content, electrical resistivity and thermal behavior of the alloy coatings were analyzed. According to the results of cyclic voltammetry (CV) analysis, increasing bath pH caused a negative shift in the cathodic deposition potential. In addition, the anodic dissolution peaks first shifted to the positive side with increasing pH and then shifted back to the negative direction. According to the results of XRD analysis, the phase structure of Cu–Zn alloys generally consists of α and β′ phases, but according to differential scanning calorimeter (DSC) analysis, it is possible that there is a γ phase in the structure in addition to these phases. In addition, pH increase (4.5 to 6.5) caused a relative increase in crystal grain size (~14 to ~ 25 nm). The Zn content of Cu–Zn coatings first increased (~pct 15 to ~ pct 55) with pH increase, then followed a horizontal trend (~pct 55 to ~ pct 59) with further pH increase and then exhibited a slight decreasing trend (~pct 59 to ~ pct 52). The pH increase significantly affected the surface morphology of the coatings and denser coatings were obtained with increasing pH. While the electrical resistivity of Cu–Zn coatings first increased (0.0408 to 0.0696 µΩcm for 297 K) with increasing pH, it tended to decrease (0.0696 to 0.0479 µΩcm for 297 K) again at higher pH values. In addition, the electrical resistivity of the coatings increased with increasing measurement temperature. According to DSC analysis of the coatings, endothermic peaks were obtained, possibly representing the transformation from γ to β′ phase. Graphical Abstract

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Two-Step Martensitic Transformation in an Aged Ti₅₀Ni₁₅Pd₂₅Cu₁₀High Temperature Shape Memory Alloys

Cited by 4 publications

References 11 publications

A Cyclic Voltammetry Study on Electrodeposition of Cu-Zn Alloy Films: Effect of Ultrasonication Time

A Cyclic Voltammetry Study on Electrodeposition of Cu-Zn Alloy Films: Effect of Ultrasonication Time

Phase Formation in Electrodeposited Cu-Zn Alloy Films Produced from Ultrasonicated Solutions

Effect of Citrate-Based Bath pH on Properties of Electrodeposited Cu–Zn Coating on an Aluminum Substrate

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