Effects of heat treatment temperatures on phase transformation, thermodynamical parameters, crystal microstructure, and electrical resistivity of NiTiV shape memory alloy

Kök, Mediha; Al-Jaf, Ahmed Omar Ali; Cirak, Zehra Deniz; Qader, İbrahim Nazem; Özen, Ecem

doi:10.1007/s10973-019-08788-3

Cited by 53 publications

(16 citation statements)

References 38 publications

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“…Entropy is another physical parameter that can change throughout a thermodynamic process. The entropy change in an austenite transformation process (∆ → ) can be calculated by the following formula [3,[29][30][31]:…”

Section: Resultsmentioning

confidence: 99%

Quaternary Element Incorporation Effects on Thermal Properties and Crystal-Micro Structure of Cu-Al-Fe High Temperature Shape Memory Alloys

Balci

Akpınar

2021

International Journal of Thermodynamics

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Recently, researchers have shown an increased interest in Cu-based shape memory alloys due to their special characteristics, which can be used in high-temperature applications. In this study, ternary shape memory alloys in the form of CuAlFe with different ratios of iron and quaternary CuAlFe alloys containing Ni, Mn, and Ti were produced by arc melting. Then the produced alloys were kept at 900 ℃ for 24 hours to make sure that all constituents in the alloys were homogeneously distributed. The change in the transformation temperatures for all samples was checked out by Differential Scanning Calorimetry (DSC). Also, the change in the crystal structure and microstructure were determined by x-ray diffractometer (XRD) and scanning electron microscopy (SEM), respectively. The aim of this study is to compare the thermal and microstructural properties of quaternary alloys formed by adding Ni, Mn, and Ti elements to CuAlFe-based shape memory alloy with different rates, which is not available in the literature. The result of this study; although the electron concentration value increased, a significant decrease was observed in the values of the transformation temperatures. Increasing Fe-element decreased the transformation temperature non-linearly. Ni and Mn contents added to CuAlFe shape memory alloys have reduced transformation temperatures, such as Af and Mf. The XRD and SEM-EDX measurements showed the martensite phase with some produced compound precipitated in the matrix phase.

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Section: Resultsmentioning

confidence: 99%

Quaternary Element Incorporation Effects on Thermal Properties and Crystal-Micro Structure of Cu-Al-Fe High Temperature Shape Memory Alloys

Balci

Akpınar

2021

International Journal of Thermodynamics

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“…There are also many engineer types such as piezoelectric materials [37] that are used in a robotic and ultrasound generator, moreover, they are used for power generating sidewalks [38]. Another type is shape memory alloys (SMAs) that their properties have been improved for Cu-based SMAs [39][40][41][42][43][44][45], NiTi-based SMAs [46][47][48][49][50][51][52][53][54], and Fe-based SMAs [55][56][57]. The aforementioned materials can be used for smart systems that generate clean energies.…”

Section: Materials Science Multidisciplinarymentioning

confidence: 99%

Recent Improvements in Renewable Energies and their effects on the Environment and the Economy: Review Article

Kanca¹,

Qader²,

Qadir³

et al. 2021

El-Cezeri Fen Ve Mühendislik Dergisi

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The increasing populations and expanding industries all over the world led to enhance the need for energy. Since most of the nowadays energies are generated by fossil fuels, so the ratio of greenhouse gases like CO 2 extremely increased that impacted the environment and other sectors. In this study, the renewable energies used globally and in Turkey have been described. Also, the different fields of studies, which covered by different researchers have been highlighted. Besides, the opportunity and the corresponding advantages that can be achieved by harnessing renewable energies have been determined. Consequently, there is good progress in development, and investments have been made in this area, especially by governments, international organizations, and highly advanced and large private companies. Finally, this article provides a detailed review by collecting and examining a variety of renewable energy sources and highlighting prospects for scientists and investors.

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“…Figure 4 shows transformation parameters, including austenite start (As), austenite finish (Af), martensite start (Ms), and martensite finish (Mf). Also, temperature hysteresis is a range of temperature between austenite and martensite phase transitions (Ercan, Dagdelen, & Qader, 2019;Kok, Al-Jaf, Çirak, Qader, & Özen, 2019;Kök et al, 2020;Toru, 2008). The SMAs are classified into SIMA (class I) and (class II), which has As>Ms and As<Ms, respectively.…”

Section: Pseudoelasticitymentioning

confidence: 99%

The Developments of piezoelectric Materials and Shape Memory Alloys in Robotic Actuator Systems

Mohammed

Kök

Qader

et al. 2019

European Journal of Science and Technology

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There is a high demand for functional smart materials, especially for new material groups in advanced Technologies. These materials are used in the actuator, sensor, control systems, and robotic systems, in addition, they can be hybridized with traditional material to create a particular function. Piezoelectric materials and shape memory alloys are the most important families among these groups. This review includes an overview of shape memory alloys (SMAs) and piezoelectric material actuator systems in terms of robotic applications. The theoretical background of each SMAs and piezoelectric materials is well explained. Different types of each system are interpreted. Using actuator-based SMAs and piezoelectricity in the robotic area is extensively overviewed. Some weaknesses and challenges facing such systems have discussed through recent studies in the literature.

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Effects of heat treatment temperatures on phase transformation, thermodynamical parameters, crystal microstructure, and electrical resistivity of NiTiV shape memory alloy

Cited by 53 publications

References 38 publications

Quaternary Element Incorporation Effects on Thermal Properties and Crystal-Micro Structure of Cu-Al-Fe High Temperature Shape Memory Alloys

Quaternary Element Incorporation Effects on Thermal Properties and Crystal-Micro Structure of Cu-Al-Fe High Temperature Shape Memory Alloys

Recent Improvements in Renewable Energies and their effects on the Environment and the Economy: Review Article

The Developments of piezoelectric Materials and Shape Memory Alloys in Robotic Actuator Systems

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