Muhammad Umer Farooq

• Chonnam National University

Shape memory alloys (SMAs) are commonly used for various applications, e.g. aerospace, automotive, telecommunication and biomedical. Although Ni-Ti SMAs are commercialized, however due to the possibility of hypersensitivity of Ni, Ti-Nb based SMAs have been developed and investigated as potential replacement of Ni-Ti alloys in biomedical applicatio...

Lead zirconate titanate (PZT) piezoelectric ceramics are commonly used in various applications, e.g. gas igniters, high-voltage generators and microbalances. However, due to increasing health and environmental concerns over their high lead content, lead-free piezoelectric ceramics are being developed. Lead-free piezoelectric single crystals offer s...

NiTi, commerciallyknownasNitinol,exhibitsuniquepropertiesofhighrecoverablestrain,shape memory effect,biocompatibility,highstrength,lowdensityandstiffness.Theporousstructureofthis material mimicsthehierarchicalstructureofbone,whichmakesitapotentialmaterialforbiomedical implants. PorousNiTishapememoryalloyswerefabricatedbypressurelesssinteringunderva...

In the present work, the single crystal growth by solid-state crystal growth of (100−x)(K0.5Na0.5) NbO3–xSrTiO3, where x = 0,1,2,3 mol-%, has been examined in order to study the effect of SrTiO3 content on single crystal growth. Powders were prepared by the conventional mixed oxide method. <001> KTaO3 seed crystals were buried in the powders, press...

In this paper, (K0.5Na0.5)NbO3 (KNN) ceramics are prepared by a simple and cost- effective reactive sintering method. Starting materials of K2CO3, Na2CO3 and Nb2O are mixed by ball-milling, pressed into pellets and sintered at 1080C, 1100C and 1120C for between 0.25-3 hours. The Archimedes density of samples sintered at 1120C reached 92% of the the...

With the development of current technology, the process of removing material from a workpiece has become much more advanced. While these developments make it possible to remove material more quickly, they frequently compromise the workpiece's accuracy and precision. This research suggests a six-degree-of-freedom machining bed that is based on a par...

Machining is the term that refers to the removal of material to obtain the desired shape and size. The current machine removal technologies allow quick material removal but this affects the accuracy and precision of the workpiece. Limiting the tool's range of motion while allowing the workpiece to move is one way to address this issue. The suggeste...

Competition between concentrated solar power and solar photovoltaic has been the subject of frequent debate in recent years based on their cost of fabrication, efficiency, storage, levelized cost of energy, reliability, and complexity of respective technologies. Taking Pakistan as a testbed, a study was conducted to determine which technology is ec...

Functional metal parts with complicated geometry and internal features for the aerospace and automotive industries can be created using the laser powder bed fusion additive manufacturing (AM) technique. However, the lack of uniform quality of the produced parts in terms of strength limits its enormous potential for general adoption in industries. M...

Herein, micromechanical simulations for three different states of spheroidized steel (C45EC) are conducted under quasi‐static tensile loading based on the actual texture and crystallographic orientation from electron backscatter diffraction (EBSD) data. Data denoising is conducted with MTex (open‐source Toolbox with MATLAB) for cleaning up the EBSD...

This research uses EBSD data of two thermo-mechanically processed medium carbon (C45EC) steel samples to simulate micromechanical deformation and damage behavior. Two samples with 83% and 97% spheroidization degrees are subjected to virtual monotonic quasi-static tensile loading. The ferrite phase is assigned already reported elastic and plastic pa...

Cogeneration of power-and-water is one of the potential solutions for ever-rising energy and freshwater demand. These systems have shown superior thermodynamic and economic performance compared to their standalone counterparts because of processes synergy and shared utilities resources. The current study investigates a multi-effect distillation sys...

As non-renewable conventional fossil fuel sources are depleting day by day, researchers are continually finding new ways of producing and utilizing alternative, renewable, and reliable fuels. Due to conventional technologies, the environment has been degraded seriously, which profoundly impacts life on earth. To reduce the emissions caused by runni...

Pakistan is among the countries that have already crossed the water scarcity line, and the situation is worsened due to the recent pandemic. This is because the major budget of the country is shifted to primary healthcare activities from other development projects that included water treatment and transportation infrastructure. Consequently, water-...

The influence of microstructural attributes of crystalline material on its overall mechanical properties is of vital importance to get desired plasticity of a component. Varying grain morphology and distribution of the multi-phase steels can pose plastic flow challenges during cold forming. The spheroidized medium carbon steels obtained by reformin...

Genetic Algorithm is applied for the first time for desalination systems performance improvement. • Energy recovery in MED system can improve GOR to 17.9% and reduce SHC by 13.8%. • Genetic Algorithm further improve the GOR by 9.26% for FF-MED configuration. • Exergoeconomic analysis provide overall evaluation of desalination systems. • Improved hy...

Machining is material removal from a workpiece. Current spindle technologies allow the material to be removed very quickly but unfortunately this compromises the accuracy of the desired machined trajectory on the workpiece. Proposed solution to the problem is restricting motion of the tool and giving rotation to the workpiece. This paper presents a...

Herein, micromechanical material deformation behavior of medium carbon steel—with varying cementite particle size and distribution—under monotonic tensile load is modeled. The statistical phase morphology data are collected from the microscopy images of 83% spheroidized C45EC steel. Virtual microstructures for nine different cases are constructed u...

Background The development of new bioimplants with enhanced mechanical and biomedical properties have great impetus for researchers in the field of biomaterials. Metallic materials such as stainless steel 316L (SS316L), applied for bioimplants are compatible to the human osteoblast cells and bear good toughness. However, they suffer by corrosion an...

In this study, electromechanical characteristics of (1-x) Bi0.5Na0.5TiO3-xSrTiO3 (ST26, x = 0.26)/(1-y) Bi0.5Na0.5TiO3-ySrTiO3 (ST10, y = 0.1) (matrix/seed) composites were studied. The ST26 (high relaxor phase) and ST10 (a relaxor ferroelectric (RF), high ferroelectric phase) composite with large (r-ST26-ST10) and small (t-ST26-ST10) grains exhibi...

Oxide nanoparticles have numerous potential applications in medicine such as carriers for therapeu- tic drugs, contrast agents for bio-imaging and targeting agents for tumors. Oxide nanoparticles may also have an inherent cytotoxicity towards cancer cells, as recently found for cerium oxide. KNbO3 nanoparticles have a combination of low toxicity a...

0.96(K0.48Na0.52)NbO3-0.03[Bi0.5(Na0.7K0.2Li0.1)0.5]ZrO3-0.01(Bi0.5Na0.5)TiO3 single crystals were grown for the first time by the solid state crystal growth method, using [001] or [110]-oriented KTaO3 seed crystals. The grown single crystal shows a dielectric constant of 2720 and polarization-electric field loops of a lossy normal ferroelectric, w...

ACCVD grown CNTs were used for the fabrication of nanocomposites via powder metallurgy technique. Varied wt. % of CNTs (0.5, 1, 1.5 and 2) was used in nanocomposites development. Effects of varied CNTs wt. % on the physical, microstructurel and phase behaviors of nanocomposites were the main investigating objectives of this study. Relatively densit...

Carbon nanotubes have proved to be very unique and versatile reinforcing agent for the development of nanocomposites in recent times. In this study, CNTs were grown on cobalt based nano particles by Alcoholic Catalytic Chemical Vapor Deposition process for the fabrication and promotion of hard metallic in-situ nanocom-posites materials. Alcoholic (...

ACCVD grown CNTs via various ACCVD reaction times were used for the fabrication of Stellite-6/CNTs nanocomposites via powder metallurgy technique. Varied wt. % of CNTs (0.5, 1, 1.5 and 2) was used for nanocomposites development. Effects of varied CNTs wt. % on hardness, compression and fracture behaviors of Stellite-6/CNTs nanocomposites were the m...

Recently, functionally graded materials (FGMs) have attracted particular research attention for their potential use in biomedical implants and joint prosthesis. In the present investigation, carbon nanotubes (CNTs) and stainless steel 316L (SS316L) reinforced hydroxyapatite (HA) hybrid FGMs were fabricated by pressureless sintering. Three types of...

Single crystal growth of BaFe12O19 by the solid state crystal growth method was attempted. Seed crystals of alpha-Fe2O3 were pressed into pellets of BaFe12O19 + 2 wt % BaCO3 and heat-treated at temperatures between 1150 degrees C and 1250 degrees C for up to 100 hours. Instead of single crystal growth taking place on the seed crystal, BaO diffused...

Ethanol has been found superior precursor for carbon nanotubes growth with lesser amount of amorphous carbon impurities. In this study, attention has been focused to determine the influence of Alcoholic Catalytic Chemical Vapor Deposition (ACCVD) reaction time on the growth and quality of CNTs via cobalt based catalyst. Effects of different reactio...