Safar Saeed Mohammed

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• Master of Science
• Lecturer at University of Raparin

Thermal and morphological analysis of shape memory alloys is one of the important branches of research to obtain new characteristics. In this study, low amounts of tantalum were added into CuAlNi alloy. The alloy was produced with the induction melting method. The phase transformation of the alloys was characterized by DSC and electrical resistivit...

The physical characteristics of a shape memory alloy can be controlled by different production techniques and the rate of constituents' contribution. In this study, CuAlNiHf shape memory alloys, with three different amounts of Hf, were produced by the induction melting method. Many measurements such as differential scanning calorimetry (DSC), scann...

In this thesis the effect of Tantalum additive into Cu-Al-Ni shape memory alloy was investigated, the sample alloys were produced by using high pure powder elements in five different compositions includes Ta0 (Cu84Al11Ni3 wt%), Ta1 (Cu83Al11Ni3Ta1 wt%), Ta2 ((Cu82Al11Ni3Ta2 wt%), Ta3 ((Cu81Al11Ni3Ta3 wt%), and Ta4 ((Cu80Al11Ni3Ta4 wt%). The Ta e...

Heat treatment is an important technique that can improve the properties of shape memory alloys. In this study the effect of heat treatment at three different temperatures (973 K, 1073 K and 1173 K) on some thermodynamics parameters, crystal structure, and microstructure of Cu_86 Al_12 Nb_2 and Cu_86 Al_12 Hf_2 (mass %) Shape Memory Alloy has been...

This study aims to investigate the improvement of ionic conductivity and other electrical parameters of a polyethylene oxide/ sodium bromide (PEO:NaBr) complex electrolyte with the use of glycerol as a plasticizer. The PEO:NaBr electrolyte was modified by insertion of various concentrations (0, 8, 16, 24, and 32 wt.%) of glycerol to boost the ionic...

This study investigates the influence of NiFe₂O₄ nanoparticles synthesized via sol-gel and hydrothermal methods on the structural, electrochemical, and dielectric properties of PEO: NaNO₃ polymer electrolytes. NiFe₂O₄ nanoparticles with crystallite sizes of 43.39 nm (sol-gel) and 29.62 nm (hydrothermal) were incorporated at varying concentrations (...

In this study, a solid polymer electrolyte (SPE) was synthesized using the solution casting method. Lithium nitrate (LiNO3) as the ion source and glycerol as a plasticizer were added in varying concentrations (9, 18, 27, and 36% by weight) to methylcellulose (MC) as the host polymer. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectr...

This study investigates the effects of heat treatment on the properties of Cu–Al–Ni shape memory alloy (SMA). The Cu–Al–Ni alloy was synthesized using an induction melting furnace, and followed by quenching (hardening) at three different temperatures (673 K, 873 K, and 1073 K) using an electrical furnace for an hour. The effects of heat treatment o...

This study investigates the effects of heat treatment on the properties of Cu–Al–Ni shape memory alloy (SMA). The Cu–Al–Ni alloy was synthesized using an induction melting furnace, and followed by quenching (hardening) at three different temperatures (673 K, 873 K, and 1073 K) using an electrical furnace for an hour. The effects of heat treatment o...

Heat treatment is an important technique that can improve the properties of shape memory alloys. In this study the effect of heat treatment at three different temperatures (973 K, 1073 K and 1173 K) on some thermodynamics parameters, crystal structure, and microstructure of Cu_86 Al_12 Nb_2 and Cu_86 Al_12 Hf_2 (mass %) Shape Memory Alloy has been...

One of the best type of smart materials is magnetic shape memory alloy due to their unique combination of magnetic and shape memory properties that this combination of these two properties has given them the opportunity to have more applications in modern technology than many other types of materials. Among all types of magnetic shape memory alloy...

Sometimes materials developed for use in technology have some shortcomings in that some of their properties need to be treated or further improved. There are several techniques to treat the shortcomings of materials, such as mechanical treatment, electrical treatment, surface treatment, chemical treatment, and heat treatment, each of these techniqu...

Biopolymers are an important type of biomaterials that have many important applications in different fields of modern technology due to their important properties. One of these fields is the medical field, where biopolymers play a significant role due to their suitability for using in this field. This study reviews the academic work done in the lit...

One of the best types of smart materials is Shape Memory Alloys (SMAs), which have more applications in modern technology such as aerospace, automotive, biomedical, civil engineering, robotics, and so on. Among all parts of them NiTi-based, and Cu-based are more focused on because they have some interesting properties that have made them more widel...

Radon is a noble gas that has a high risk to the human body, and existence at various rates in soil, air and different sources of water. Moreover, radon has a short lifetime but it can produce more risk to public health. Humans are good users of water by food, drinking water, vegetables, showers and dishwashing, however, we do have not good knowled...

Biomaterials are listed in advanced materials that have high biocompatibility which can easily adapt to the system in which they are implanted without leaving any adverse reactions and side effects. Due to their interesting properties such as biocompatibility, bioactivity, degradability, long-term stability, and many other important properties,...

The effect of Ta and Nb (25 at %) on the thermal, mechanical, and corrosion behaviors of TiNi shape memory alloy has been investigated. Ta and Nb added TiNi shape memory alloy samples that were prepared using the arc melting technique. The composition and crystal structure of the TiNi alloys were characterized by SEM-EDX and XRD at room temperature...

In this study, Ti50Ni30Ta20 (at/%) alloy, whose thermal, structural, mechanical properties and corrosion behavior was investigated, was produced by arc melting method. Some physical and chemical properties of the produced alloy such as thermal stability, phase transformation temperatures, thermal activation energies, microstructure, electrochemical...

β-titanium shape memory alloys are used as shape memory-based biomedical applications and superelastic materials because they are made up of non-toxic components. Also, their behaviors are more semilar with that of human bone and dental biological tissues, such as biocompatibility, superior corrosion resistance, low density, and low modulus of elas...

Despite of many interesting behaviors and attractive properties of Shape memory alloys (SMAs), there are some drawbacks and limitations that prevent them from being used in technology. But there are some treatment techniques that can be used to improve the behaviors of shape memory alloys. Also, they can remove or reduce the limitations of SMAs. In...

The influence of four different quantities of niobium (Nb) on some physical and chemical properties of Ni-Ti alloy was examined in this study. Furthermore, the effect of thermal cycling at different temperatures on some thermodynamic parameters was examined. The arc melting technique was conducted for the sample fabrication procedure. Differential...

NiTi-based shape memory alloys (SMAs) have many applications, especially for implantation, however since they are not a passive material so it is important to investigate them from different biocompatible perspectives. In this study, we introduced the important physical characteristics of NiTi alloys, then we explained different biocompatible termi...

In the present study, the effect of adding different compositions of Zirconium and Hafnium on thermal, electrical, and magnetization behaviors of a Cu-Al-Mn-based shape memory alloy has been investigated. The samples were produced by the arc melting method in a controlled environment. According to DSC results, the austenite phase transformation tem...

Shape memory alloys have the thermoelastic phase transformation, known as shape memory characteristics, which make them be used in wide technological applications compared to other alloys. Ni-Ti based SMAs compared to the other families have more applications especially in the biomedical field since they have high biocompatibility, high strain reco...

Subjects: Astrochemistry, Biochemistry, Biomaterials, And Their Applications, Ceramics And Composite Materials, Computational Methods, Crystallography, And Scattering Methods, Electrical/Electronic Optical And Magnetic Materials, Emerging Smart Materials, Food Technology, Gas-phase Reactions, Green Chemistry, Kinetics, And Dynamics, Materials Scien...

Coating shape-memory alloys (SMAs) with a ceramic layer is an important way by which metallurgists change some physical properties and improve biocompatibilities of (SMAs) for some medical purposes. The oxidation behaviors of five NiTiCo samples with different compositions were investigated and their influence on the thermal characteristics of phas...

NiTi shape memory alloys (SMAs), as smart materials, are broadly used in medical implants and appliances despite the presence of toxic Ni. In this study, NiTiNb alloys were produced using the substitution of biocompatible Nb instead of Ni. The arc-melting method was utilized to make five SMA samples comprising Ni(29−x)Ti50Nb(21+x) (x = 0, 1, 2, 3,...

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...

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...

This study presents the heat treatment effect on a quaternary Cu79Al13Ni4Ta4 (wt.%) shape memory alloy. The alloy was produced using the induction melting technique. After solutionizing, four pieces of the alloy were heat-treated at (673K, 873K, 1073K, and 1273K) for one hour. Some physical parameters were characterized using DSC, XRD, and SEM-EDX....

Thermodynamics is the branch of physics science that deals with heat and temperature, and their relation to energy, work, radiation, In particular, it describes how thermal energy is converted to other forms of energy and how it affects matter based on a set of four laws that we tried to describe them in the below parts. Abstract: application of th...

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