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 (8 papers in press)

Regular Issues

  • Asymmetric Gated Ge-Si0.7Ge0.3 nHTFET and pHTFET for Steep Subthreshold Characteristics   Order a copy of this article
    by Suman Lata Tripathi, Sobhit Saxena 
    Abstract: The miniaturisation of transistors imposes thermal limits on MOSFET structures due to increase in leakage current and static power consumption per unit area of chip below 20 nm technology node. Tunnel FET has potential to reduce static power consumption to design below 20 nm technology within thermal limits thus increases the scope of future scaling trends. A new asymmetric Ge-Si0.7Ge0.3 hetero-junction tunnel FET (HTFET) is proposed with different oxide thickness from source and drain side. The asymmetric Ge-Si0.7Ge0.3 HTFET has steep subthreshold characteristic, low DIBL with high ION/IOFF current ratio for operating voltage less than 1V. The proposed design can be fabricated easily due to the similar lattice structure of Ge and Si. The ION/IOFF current ratio greater than 108 is achieved for gate length of 15 nm in nHTFET having Pt/HfO2 as gate contact and oxide material. The lowering of parasitic BJT effect in OFF state condition is also achieved in the same.
    Keywords: band to band tunnelling; BTBT; drain induced barrier lowering; DIBL; subthershold slope; SS; hetero-junction; narrow band gap material.
    DOI: 10.1504/IJMMP.2019.10022985
     
  • Micro hardness and corrosion properties of A390alloy + x vol. % Zirconium dioxide (ZrO2) composites processed by P/M method   Order a copy of this article
    by Karthikeyan S, M. Subramanian, Ashoke Ghosh, M. Prashanth, R. Karunanithi 
    Abstract: A390+X vol. %ZrO2 (X=5, 10, 15) composites have been fabricated through P/M technique. The mixed aluminum alloy and zirconium oxide powders were cold compacted at 200MPa and sintered at 580
    Keywords: A390 alloy; Zirconium Oxide; Corrosion; Vickers micro hardness; Powder Metallurgy.

  • Comparison of texture evolution in low carbon steel fabricated by plane strain and multi-directional forging of the martensite starting structure   Order a copy of this article
    by Mahdi Saalari 
    Abstract: It has been clarified that deformation and annealing of martensite starting structure can produce ultrafine grained structure in low carbon steel. This study aims to investigate the texture evolution and mechanical properties of samples with martensite structure deformed by two different forging processes. The martensitic steel samples were forged by plane strain compression and multi-directional forging up to the same true strain of 2. All samples were then annealed at 450 and 550
    Keywords: texture evolution; martensite treatment; multi-directional forging; plane strain compression; low carbon steel; mechanical properties.
    DOI: 10.1504/IJMMP.2019.10022997
     
  • Structural, Thermal and Electrical Properties of Ionic Conductors (AgPO3)1-x(Ag2SO4)x Glass Systems   Order a copy of this article
    by Atif Alkhazali, Morad Etier, Mohammad Aljarrah, Hesham Al-Momani, Fathy Salman 
    Abstract: This study aims to investigate the effect of temperature and frequency on the ac conductivity of ion conducting glasses systems of (AgPO3)1-x(Ag2SO4)x, where x = 0.00, 0.10, 0.15, 0.20 and 0.25. Structural characterisation was examined in different samples using different techniques. At lower frequency range, the frequency dependence of the total conductivity was nearly constant and then followed a power relation as frequency and temperature increased. The observed values of the exponent S were somehow frequency-dependent and decreased with increasing temperature from 1.3 to 0.2 for the composition when x = 0.15. The cutoff frequency from dc to the dispersive region, c, increased with temperature. In addition, c values were within the same range as other values. Total conductivity tot() was found to be thermally activated of the Arrhenius type.
    Keywords: ionic conductivity; impedance spectroscopy; glass synthesis.
    DOI: 10.1504/IJMMP.2019.10024521
     
  • Thermomechanical interactions due to Time Harmonic Sources in a Transversely Isotropic Magneto Thermoelastic Solids with rotation   Order a copy of this article
    by Iqbal Kaur, Parveen Lata 
    Abstract: The present research deals in two dimensional transversely isotropic magneto thermoelastic solid with rotation due to time-harmonic source in generalized Lord-Shulman (LS) theory of thermoelasticity. The Fourier transform has been used to find a solution to the problem. The displacements components, stress components, and conductive temperature distribution with the horizontal distance in the physical domain are calculated numerically. The effect of rotation and various frequencies with two temperature (WTT) are depicted graphically on the resulting quantities. The proposed model is helpful for finding the type of relations between mechanical and thermal fields as most of the structural elements of heavy industries are frequently related to mechanical and thermal stresses at a higher temperature.
    Keywords: Transversely isotropic Magneto thermoelastic; Mechanical and Thermal stresses; Time harmonic source;.

  • Simulation Analysis of Intake Transition Section Steel Lining for Hydropower Station Penstock   Order a copy of this article
    by Wen-liang MA, Qi-xuan GUO 
    Abstract: In order to improve the bending stiffness of steel plate structure, anchor bars and stiffeners are used to anchor the thin steel plate in the intake transition section in the concrete. In this paper, the finite element method is used to simulate the steel lining at the penstock intake transition section of hydropower station. The analysis results show that, the overall deformation of steel lining structure is small, which can meet the requirement of stiffness, the stress of steel lining structure is complex, the stress concentration at the stiffening ring is very high, the stress value of other parts is low, and the general stress value does not exceed 43.0 MPa, and the stress distribution is more uniform. The structural stress value of dam in the gate section is relatively low, through conventional reinforcement can meet the design requirements.
    Keywords: Penstock; Intake transition section; Steel lining; Stiffening ring; Finite element method; Deformation analysis.

  • Mechanics Study of Automotive Aluminum Alloy Materials Based on Elastohydrodynamic Model   Order a copy of this article
    by Jianna Huang, Xuang Wang 
    Abstract: In order to solve the problem of large error in traditional testing methods for automotive aluminum alloy materials, a testing method for mechanical properties of automotive aluminum alloy materials based on Elastohydrodynamic model was proposed. Firstly, the Elastohydrodynamic model of automobile aluminium alloy material is constructed to obtain the bearing capacity and strength of automobile aluminium alloy material. Secondly, based on the Elastohydrodynamic model of automobile aluminium alloy material, the load and yield strength of automobile aluminium alloy material mechanical components are analyzed, and the vehicle use is estimated. Parameters of mechanical components of aluminium alloy materials. Finally, the mechanical properties of automotive aluminium alloys were further optimized by the evaluation method of under-actuated two-degree-of-freedom mechanism and the calculation of the coupling eigenfunction of mechanical properties of aluminium alloys and the energy equation of the relationship between friction force and friction coefficient.
    Keywords: Elastohydrodynamic Model; Aluminum Alloy Materials; Mechanical Properties; Thermoelasticity.

  • Translucent - and /-SiAlON Ceramics: Study on investigation of the relationship between phase diversity and optical properties   Order a copy of this article
    by Suna Avcioglu, Semra Kurama 
    Abstract: In this study, Dy+3, Y+3, and La+3 doped SiAlON ceramics were fabricated by using spark plasma sintering (SPS) technique. The effects of additive cation, starting composition and processing conditions on the morphological evolution as well as on the phase assembly of SiAlON ceramics were investigated. The influence of phase diversity on the optical properties of SiAlON ceramics was also discussed. The microstructure and phase characterization of the samples was carried out by using SEM and XRD techniques, respectively. The IR transmittance of the sintered SiAlON ceramics was inspected in 2000-7000 cm-1 wavenumber region by using FTIR. Results indicate that translucent α- SiAlON, α/β-SiAlON ceramics and their in-situ composites with AlN-polytypoids were successfully obtained. The presence of a high amount of secondary phases such as AlN-polytype and the oxynitride glassy phase has been found to reduce the optical transmission of SiAlON ceramics. The Y+3 and Dy+3 cations contribute better to the formation of single-phase α-SiAlON than La+3. Doping SiAlON ceramics with Dy+3 cation leads to the formation of relatively homogenized final microstructure. Therefore, higher IR transmission values were observed on Dy-α-SiAlON (42.2%) and Dy-α/β-SiAlON (45.07%) samples. Additionally, final grain size/grain size distribution and density of the sintered bodies are influential factors on optical properties of SiAlON ceramics.
    Keywords: SiAlON; phase composition; SPS; microstructure; optical properties.