Forthcoming articles

International Journal of Microstructure and Materials Properties

International Journal of Microstructure and Materials Properties (IJMMP)

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International Journal of Microstructure and Materials Properties (6 papers in press)

Regular Issues

    by Medhavi Sinha 
    Abstract: The fiber composites are special materials consisting of unique properties such as high specific strength, high specific stiffness, corrosion resistance, high fatigue life etc. They have immense potential to replace the traditionally utilized materials, steel and aluminum for manufacturing of various components of vehicles which renders them very heavy and bulky. This paper demonstrates the feasibility of producing innovative alternative lighter composite materials using E-glass for increasing the safety, movability, performance of the military vehicles. Five different composites were synthesis without fillers and with 4% ZnO, SiO, carbon black and hybrid fillers using hand layup technique. Various mechanical tests such as tension, compression, flexural, inter laminar shear, impact and hardness test were performed on the composites to evaluate and analyze their mechanical properties for exploration of their effective utilization in automobiles. The study determined that the composite with ZnO filler manifested superlative behavior in comparison to other materials under examination.
    Keywords: Fiber composites; fillers; mechanical properties; vehicles.

    by Swaminathan G, Kumar S D, Sathiyamurthy S, Mathivanan A 
    Abstract: Friction Stir Welding commonly known as FSW. It is under solid state welding, which is one of the advancement in the field of welding. Even though the technology is not yet fully commercialised yet, there is an increasing trend in the research and analysis on this subject. This paper focuses on the investigation of mechanical properties and fracture behaviours of dissimilar aluminum alloys of AA7075 and AA6101 joints with respect to process control variables. The macro and microstructure, scanning electron microscopy were conducted to study domination of process control variables for dissimilar friction stir welded joints. Effective mixing of both the materials joined was obtained at moderate welding speed and tool rotational speed . From this investigation it is found that the joints fabricated with taper cylindrical tool profile provide the better mechanical properties compared to other tool profiles.
    Keywords: Solid state welding; mechanical properties; microstructure; SEM; tool profile; fracture behaviours.

  • Thermal Microscopy (TM)   Order a copy of this article
    by A.M. Mansour 
    Abstract: Thermal analysis is an analytical method that contains a wide variety of essential approaches that study the materials by testing their properties variations with the variation of heating and time. Many thermal techniques are available for characterization of many of the thermochemical and thermophysical features of the materials such as differential scanning calorimetry (DSC), differential thermal analysis (DTA), thermogravimetry (TG), thermomechanical analysis (TMA), dynamic mechanical analysis (DMA), and thermoptometry. Thermoptometry is one of the thermal analysis techniques that defined as a family of thermoanalytical techniques where an optical feature of the test sample is monitored with time and/or temperature. An important member of the thermoptometry family is the thermomicroscopy, which is also referred to as thermal microscopy (TM), optical thermal analysis (OTA), fusion methods, or hot-stage microscopy (HSM). Some thermal transitions cannot be understood accurately with common thermal analysis techniques. Hot-stage (thermal) microscopy is the blend of microscopy and thermal investigation to allow the properties of the materials to study with heating and time. Besides determining details about particle size and particle morphology, the optical evaluation offers useful data about the substance under testing relating to glass transition, melting transition or various other thermal changes. Thermal microscopy provides an excellent possibility to visually observe thermal changes. Thermomicroscopy is a supporting technique to investigate the thermal behavior in these kinds of events and to understand the different thermal phenomena.
    Keywords: Optical; Thermal analysis; DSC; DTA; TGA; Microscopy.

  • MoO3:In2O3 Binary Oxide Thin Films as CO Gas Sensor   Order a copy of this article
    by Nimba Kothawade, Vikas Deshmane, Arun Patil 
    Abstract: The aim of the study was to understand gas sensing properties of thin films of molybdenum trioxide and indium oxide (MoO3-In2O3) indifferent normality proportions. Thin films were prepared by spray pyrolysis technique on glass substrates at 400?C. The films were characterized using X-ray diffraction, scanning electron microscope and energy dispersive analysis by x-ray spectra. The electrical and gas sensing properties of the films were studied using static gas sensing apparatus. The resistivity of films increased by adding MoO3 as the dopant in In2O3. The maximum resistivity of film was found 1.75 x104 ?m for 0.3N (MoO3) and 0.1N (In2O3) binary oxide films. The films were tested against five different target gases. The composition ratio 0.3N:0.1N films showed the 70.50% sensitivity for 300 ppm CO gas at 1500C. The response time (15s) and recovery time (25s) was found to be quick.
    Keywords: MoO3; In2O3; Spray Pyrolysis; Carbon monoxide; Gas sensor.

  • Dispersion of electrically conductive carbon fibers in self-compacting concrete using chemical and mechanical dispersing techniques   Order a copy of this article
    by Iftekar Gull, M.A. Tantray 
    Abstract: The carbon fiber reinforced cement composites (CFRC) have a recent novel contribution to structural health monitoring. The inclusion of electrically conductive carbon fibers in the concrete has proven to be effective in providing non-structural functions such as structural health monitoring with self-sensing property for sensing the damage, temperature, and strain, electromagnetic reflection for electromagnetic interference shielding and self-heating for thawing. The integration of the short carbon fibers (SCF) in the concrete renders the electrical property of fibers into the non-conducting concrete and makes the concrete electrically conductive that result in the improvement of the non-structural functions of the concrete. However, the efficiency of the electromechanical performance of carbon fiber-based concrete is significantly dependent on the dispersion and distribution of carbon fiber thread filaments in the cement composite. The process and method of dispersion to de agglomerate the carbon fiber filaments plays thus a critical role. In this study, the influence of the mechanical de-agglomeration of carbon fibers in the mixing water blended with methylcellulose and sodium dodecyl benzene sulfonic acid salt (SDBS) for dispersion of carbon fibers in self-compacting concrete (SCC) was studied. The mechanical energy needed for de-agglomeration was provided by churning the carbon fibers in the treated water using mechanical churner at varying speed of 1440RPM to 23000RPM. The degree of dispersion was evaluated by investigating the variations in rheological, electro-mechanical and microstructure properties of carbon fiber reinforced SCC. It was observed that the mechanical churner at lower speed (1440RPM to 11000RPM) in the surfactant blended water successfully de-agglomerated the carbon fiber filament threads without disturbing their individual morphology that resulted in better distribution of fibers in the concrete. Microstructure images further confirmed the role of mechanical mixing in improving the dispersion of fibers. The use of methylcellulose did not contribute to the dispersion properties as such.
    Keywords: Mechanical Dispersion; Methylcellulose; Surfactants; Carbon fiber; Self Compacting Concrete; Electrically conductive concrete.

Special Issue on: ICWNDT2018 Welding and Non-Destructive Testing

  • Influence of interlayer temperature on microstructure of 5183 aluminium alloy made by wire arc additive manufacturing (WAAM)   Order a copy of this article
    by Karan Derekar, David Griffiths, Sameehan Joshi, Jonathan Lawrence, Xiang Zhang, Adrian Addison, Geoff Melton, Lei Xu 
    Abstract: The variations in mechanical properties compared to the traditional processed (wrought) products, porosity formation, and solidification cracking are the primary concerns that may restrict industrial applications of WAAM aluminium alloy products. Interlayer temperature is one of the crucial factors that can adversely affect the built quality and properties of material produced using WAAM. The paper aims at the possible effects of different interlayer temperatures on the geometry and microstructure of WAAM aluminium 5183 alloy as a function of varying heat input. For a given heat input, samples built using a higher interlayer temperature (100
    Keywords: Wire arc additive manufacturing (WAAM); aluminium; interlayer temperature; microstructure; layer geometry.