Yazar "Akyıldız, Öncü" için listeleme
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Assessing The Volume Fractions Of The Phases, Nodularity And Nodule Count Of Spheroidal Graphite Cast Iron Using Imagej Software
In this study, a simple method for assessing the microstructure of ductile cast iron by using a freeware digital image processing software is described. The method is applied to three different ductile iron grades to assess ... -
Dynamics of phase transformation in LiFePO4 in battery electrode
Yu, Huichia; Orvañanos, Bernardo; Akyıldız, Öncü; Thornton, Katsuyo (International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, 2015)[No abstract available] -
A fully coupled thermal–microstructural–mechanical finite element processmodel for directed energy deposition additive manufacturing of Ti–6Al–4V
Tuna; Baykasoğlu, Cengiz; Akyıldız, Öncü; C.To, Albert (TAYLOR & FRANCIS LTD, 2023)A fully coupled thermal–microstructural–mechanical finite element modelling framework is developed to investigate the distortion and residual stresses during directed energy deposition (DED) of multi-phase Ti–6Al–4V alloy. ... -
İkincil lityum iyon piller için çift aktif malzemeli katotların geliştirilmesi ve karakterizasyonu
Yılmaz, Ezgi (Hitit Üniversitesi, 2023)Lityum iyon pillerin ana bileşenlerinden olan katot aktif malzemelerden elektrikli araç teknolojileri, tüketici elektroniği vb. gibi uygulamalarda istenen performans (enerji yoğunluğu, güç yoğunluğu, güvenlik ve fiyat) ... -
Particle-size and morphology dependence of the preferred interface orientation in LiFePO4 nano-particles
Abdellahi, Aziz; Akyıldız, Öncü; Malik, Rahul; Thornton, Katsuyo; Ceder, Gerbrand (Royal Society of Chemistry, 2014)We gain new insights into the equilibrium properties and potential two-phase lithiation mechanisms in LiFePO4 nano-particles by conducting a first-principles investigation of the anisotropic chemical interfacial energy ... -
Predicting microstructure evolution during directed energy deposition additive manufacturing of Ti-6Al-4V
Baykasoğlu, Cengiz; Akyıldız, Öncü; Candemir, Duygu; Yang, Qingcheng; To, Albert C. (American Society of Mechanical Engineers (ASME), 2018)Laser engineering net shaping (LENS) is one of the representative processes of directed energy deposition (DED) in which a moving heat source having high-intensity melts and fuses metal powders together to print parts. The ... -
A process-microstructure finite element simulation framework for predicting phase transformations and microhardness for directed energy deposition of Ti6Al4V
Baykasoğlu, Cengiz; Akyıldız, Öncü; Tunay, Merve; To, Albert C. (Elsevier, 2020)This paper presents a process-microstructure finite element modeling framework for predicting the evolution of volumetric phase fractions and microhardness during laser directed energy deposition (DED) additive manufacturing ... -
Simulation of phase equilibria in high chromium white cast irons
Akyıldız, Öncü; Candemir, Duygu; Yıldırım, Hakan (Uludağ University, 2018-12)In this study, using the Materials Calculator software program, the pseudo binary phase diagrams (i.e. isoplethal maps) of high chromium white cast irons (~19% in weight) with different molybdenum contents were simulated. ... -
Synthesis, characterization and electrochemical performance of Nb doped LiFePO4/C cathodes by mechanochemical activation
Bağcı, Cengiz; Akyıldız, Öncü (Hitit University, 2018)We synthesized Nb-doped LiFePO4/C nano composite cathode materials by mechanochemical activation followed by a single step calcination. The starting chemicals of Li2CO3, FeC2O4.2H2O, NH4H2.PO4 and C6H8O7 as lithium, iron, ... -
Thermal grooving by surface diffusion: a review of classical thermo-kinetics approach
Akyıldız, Öncü; Oğurtanı, Tarık Ömer (Hitit University, 2017)In polycrystalline materials wherever a grain boundary intersects a free surface and whenever the topographic variation associated with the atomic motion is favored by total free energy dissipation, the material surface ... -
The thermodynamic stability of intermediate solid solutions in LiFePO4 nanoparticles
Abdellahi, Aziz; Akyıldız, Öncü; Malik, Rahul; Thornton, Katsuyo; Ceder, Gerbrand (Royal Society of Chemistry, 2016)Theoretical predictions from first principles and recent advances in in situ electrochemical characterization techniques have confirmed the presence of solid-solution states during electrochemical (de)lithiation of LiFePO4 ... -
Yönlendirilmiş enerji bırakımlı eklemeli imalat süreçlerinde meydana gelen metalurjik faz dönüşümlerinin sonlu elemanlar yöntemi kullanılarak benzetilmesi
Baykasoğlu, Cengiz; Akyıldız, Öncü; Tunay, Merve (2019)Son yıllarda popülerlik kazanmış olan eklemeli imalat teknolojileri kullanılarak önceden imalatı veya tamiri oldukça zor veya imkânsız olan yapısal parçalar metalik, seramik, polimer ve karma malzemeler kullanılarak imal ...
