نتایج جستجو برای: petch relationship
تعداد نتایج: 553574 فیلتر نتایج به سال:
The practice of cardiology is increasingly constrained by guidelines, regulations, and legal considerations. Cardiologists, like any other group of doctors, have a primary duty of care to individual patients, but also have wider responsibilities to society in general, to their institution, and to their colleagues. In the UK these duties and responsibilities have been defined by the General Medi...
The ferrite fraction and phase distribution of duplex steels depend strongly on the temperature evolution during hot deformation are correlated to different mechanical behaviors as well cold deformation. Therefore, control microstructure forming is relevant for target-oriented material design. In flow stress modelling forming, influence beyond often neglected. present work, a new method demonst...
The local microstructure, texture gradient and mechanical properties through the shoulder dimension (10 mm) of upper lower AA5182 aluminum sheets were investigated using electron backscatter diffraction (EBSD) Vickers microhardness after friction stir spot welding (FSSW). Based on microstructural features (mean grain size, boundary type dynamic recrystallization (DRX)), sheet was found to be ma...
AZ61/carbon nanotubes (CNTs) (0, 0.1, 0.5, and 1 wt.%) composites were successfully fabricated by using the stir-casting method. Hall–Petch relationship superposition of different strengthening mechanisms analyzed for aged as-cast AZ61/CNTs composites. Aged showed higher frictional stress (108.81 MPa) than that (31.56 Mpa) when grain size was fitted directly against experimentally measured yiel...
We introduce a modified phase field crystal (MPFC) technique that self-consistently incorporates rapid strain relaxation alongside the usual plastic deformation and multiple crystal orientations featured by the traditional phase field crystal (PFC) technique. Our MPFC formalism can be used to study a host of important phase transformation phenomena in material processing that require rapid stra...
The hallmark of materials science is the ability to tailor the structures of a given material to provide a desired response. In this work, the structures involving crystallinity and crystallographic orientation of Cu nanowires electrochemically fabricated in ion-track templates have been investigated as a function of fabrication condition. Both single crystalline and polycrystalline nanowires w...
We report on molecular-dynamics (MD) simulations of tensile loading of nano-crystalline Al modeled by an embedded-atom method (EAM) potential. Usage of two different sample preparation methods of the nano-crystalline material allows us to compare mechanical properties for different sample qualities. A Voronoi-constructed polycrystal exhibits nearly no pores and has different mechanical properti...
We present the first and southernmost records of the fungi Hirsutella strigosa Petch, H. citriformis Speare (Ascomycota: Hypocreales), and Pandora nouryi (Remaudière & Hennebert) Humber (Zygomycota: Entomophthorales) infecting Doru lineare (Eschscholtz) (Dermaptera: Forficulidae), Ectopsocus californicus (Banks) (Psocodea: Ectopsocidae), and Heterocaecilius sp. (Psocodea: Pseudocaeciliidae), re...
High temperature nanoindentation experiments are conducted to assess the activation enthalpy for deformation of nanocrystalline Ni-W alloys, for grain sizes between 3 and 80 nm. Thermal softening becomes less pronounced at finer grain sizes, and the activation enthalpy has an apparent inflection at a grain size near ~10-20 nm, in the vicinity the Hall-Petch breakdown. This inflection is related...
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