منابع مشابه
Grain-size dependence of plastic deformation in nanocrystalline Fe
Plastic deformation of nanocrystalline Fe was investigated by nanoindentation. Samples, synthesized by mechanical attrition, consisted of powder particles with diameters greater than 30 mm. The average grain diameters within the particles of different samples ranged from 10 nm to 10 mm. To avoid potential artifacts, samples were prepared without use of heat treatment, and measurements were cond...
متن کاملPlastic Flow and Grain Refinement Under Simple Shear-Based Severe Plastic Deformation Processing
In the present work, effects of loading scheme and strain reversal on structure evolution are studied by using high pressure torsion (HPT) and twist extrusion (TE) techniques. High purity aluminum (99.99%) was processed at room temperature up to a total average equivalent strain of ~4.8 by TE and HPT with two deformation modes: monotonic and reversal deformation with a step of 12 ̊ rotation. It ...
متن کاملThermodynamics and kinetics of grain boundaries in ultra fine grained copper produced by severe plastic deformation
1 List of symbols and abbreviations 3 Chapter 1: INTRODUCTION 6 Chapter 2: LITERATURE SURVEY 8 2.1: The essence of ultra fine grained materials 8 2.2: Severe plastic deformation: a method for producing UFG microstructure 11 2.3: Physical properties of materials derived from GB character 15 2.4: Non-equilibrium GBs: theoretical aspects 16 2.4.1: Conventional models for GB structure 16 2.4.2: Mod...
متن کاملGrain growth in a bulk nanocrystalline Co alloy during tensile plastic deformation
A bulk nanocrystalline Co–P alloy was subjected to tensile tests. Grain growth from approximately 12 nm in the as-deposited state to about 25 nm after the tensile test was observed. Grain growth was not observed when the deforming volume was increased, or when the specimen was annealed at 433 K or above prior to the tensile tests. 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights ...
متن کاملMeasuring Plastic Deformation
This article describes the current level of understanding of dislocation plasticity in thin films and small structures in which the film or structure dimension plays an important role. Experimental observations of the deformation behavior of thin films, including mechanical testing as well as electron microscopy studies, will be discussed in light of theoretical models and dislocation simulatio...
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ژورنال
عنوان ژورنال: Quantum Beam Science
سال: 2019
ISSN: 2412-382X
DOI: 10.3390/qubs3030017