نتایج جستجو برای: microstructural evolution
تعداد نتایج: 353951 فیلتر نتایج به سال:
Friction stir welding (FSW) was conducted on AISI 304 austenitic stainless steel plate with 2 mm thickness. The FSW was performed at a welding and rotational speeds of 50 mm/min and 400 rpm, respectively. Microstructure observations by the optical microscopy showed that a severe grain refinement occurred in the stir zone (SZ). Electron backscattered diffraction analysis (EBSD) results indicated...
The microstructural evolution of Fe–0.2C–5Mn steel during intercritical annealing with holding time for up to 144 hours was examined by TEM and STEM. It was demonstrated by TEM that the martensite lath structure gradually transformed into a lamellar ferrite and austenite duplex structure. The partitioning of manganese from ferrite to austenite was found by STEM. Typical Kurdjumov-Sachs orientat...
Ta-doped tin oxide, SnO , films have been deposited using metalorganic chemical vapor deposition system on sapphire (0001) 2 substrates in temperature range of 400–6008C. When Ta concentration is varied from 0 to 8.30 at.% in the films, the electrical resistivity is changed by three orders of magnitude where the minimum resistivity was observed at 1.35% of Ta. An increase in the carrier concent...
The driving force for coarsening is provided by the excess interfacial free energy. In a system with isotropic interface energies, classical coarsening theories can predict the evolution of the sizes of spherical crystals. However, if the interfaces are anisotropic, crystal growth and shrinkage may be limited by the surface attachment/detachment rate, the motion of ledges, or the nucleation of ...
[3] M. Burger, F. Haußer, C. Stöcker, A. Voigt, A level set approach to anistropic flows with curvature regularization, Preprint (2006), submitted. [4] W.C. Carter, J.E. Taylor, J.W. Cahn, Variational methods for microstructural evolution, JOM 49 (1997), 30-36. [5] K.Deckelnick, G.Dziuk, A fully discrete numerical scheme for weighted mean curvature flow, Numer. Math. 91 (2002), 423-452. [6] F. ...
Nematic liquid crystals are textured, anisotropic, viscoelastic materials. The remarkable rheological properties of viscoelastic materials are governed by the flow-induced evolution of molecular configuration. Analogues to liquid crystal flow processes occur in the supramolecular selfassembly processes of living biological tissues. A good understanding of the relationships between rheological p...
Durability of engineering workpieces surfaces is well-known to be strongly related to the microstructural evolutions induced by machining processes. One current challenge is to choose the right process parameters, such as the sliding speed, in order to optimize both the subsurface microstructure and the surface properties. In this paper, a special tribometer, able to simulate contact pressures ...
An effect of rolling temperature on the mechanical properties and microstructural evolution of an Al-Mg-Si alloy was studied. The material was rolled up to a true strain of ∼0.7 at three different temperatures viz; room temperature, liquid propanol and liquid nitrogen. The liquid nitrogen rolled sample exhibited superior properties with a yield and tensile strength of 332 MPa and 364 MPa, respe...
In the present study, 1.1 volume percent of nano size copper was incorporated into pure tin using hybrid microwave sintering assisted powder metallurgy route. Microwave sintered samples were extruded both at room temperature and at 230 °C. Microstructural characterization studies were conducted on the extruded samples to investigate the distribution characteristics of secondary phase and grain ...
We report experimental observations on the evolution of acoustic entropy in the course of cyclic loading as degradation occurs due to fatigue. The measured entropy is a result of the materials’ microstructural changes that occur as degradation due to cyclic mechanical loading. Experimental results demonstrate that maximum acoustic entropy emanating from materials during the course of degradatio...
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