Ultrafine-grained materials
Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview
... UFG Materials SCC sensitivity of UFG materials by SPD has far less been studied as compared to corrosion ...UFG materials is that structural materials which exhibit SCC are generally high ...
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Process Modelling of Equal Channel Angular Pressing for Ultrafine Grained Materials
... The strain rate sensitive (m ¼ 0:5) materials in Fig. 5(c) shows that the outer (bottom after pressed) part of the workpiece experiences more severe deformation and the inner (top after pressed) part of the ...
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Room Temperature Superplaticity in Fine/Ultrafine Grained Materials Subjected to Severe Plastic Deformation
... constant and T is the absolute temperature) G is the shear modulus, b is the burgers vector, · is the flow stress, k is the Boltzmann’s constant, d is the grain size, n is the stress exponent and p is the inverse gran ...
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Historical Studies by Polish Scientist on Ultrafine Grained Materials by Severe Plastic Deformation
... Erbel investigated the mechanical properties of severely deformed materials by hardness measurement, tensile test and torque measurement. For pure aluminum (Al0.22% F, 0.18% Si, 0.01% Mg/Mn/Zn, 0.01% Zn, 0.001% ...
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Mechanical behavior of ultrafine-grained materials under combined static and dynamic loadings
... Rittel and co-workers (11) proposed a possible mechanism of ASB initiation, i.e., dynamic recrystalization. The microstructure of UFG materials are usually unstable compared to their coarse grain (CG) conterparts, ...
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Radiation Tolerance of Ultrafine Grained Materials Fabricated by Severe Plastic Deformation
... metallic materials. SPD materials typically have submicron grain size; for some alloys, the grain size can be reduced to a value less than 100 ...ultrafine- grained (UFG) structure and, consequently, ...
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Superior Strength in Ultrafine Grained Materials Produced by SPD Processing
... Recent studies demonstrated that the processing of metallic alloys by severe plastic deformation (SPD) can result in not only strong grain re fi nement but also leads to the formation of grain boundaries (GBs) with ...
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Ten years of severe plastic deformation (SPD) in Iran, part II: accumulative roll bonding (ARB)
... UFG materials produced by SPD causes the mechanical properties deterioration of these materials because of the remarkable grain growth of the ultrafine grains during welding at high temperatures ...
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Incremental ECAP as a novel tool for producing ultrafine grained aluminium plates
... Abstract. Conventional equal channel angular pressing is an efficient technique to obtain bulk ultrafine grained materials (UFG) with extraordinary mechanical properties in the form of rods. In this ...
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Special Grain Boundaries in Ultrafine Grained Tungsten
... structural materials [1–3]. The role of GBs in these ultrafine-grained materials is enhanced due to the ex- tremely increased amount of GBs, their total area, and the corresponding fraction of ...
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Extra Strengthening and Superplasticity of Ultrafine Grained A2024 Alloy Produced by High Pressure Sliding
... Figure 4 shows TEM microstructures observed on the SD-TD section after HPS processing under 2 GPa. The up- per image in each figure is a bright-field image, the lower image is a dark-field image, and the center shows an ...
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Microstructure and mechanical properties of friction stir welded joints made from ultrafine grained aluminium 1050
... Generally, FSW welding of aluminium plates after SPD causes a relatively high reduction in hardness in the stir zone, which is consistent with results obtained in [13,16]. In this zone, grain coarsening is expected to ...
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Brittle grain-size reduction of feldspar, phase mixing and strain localization in granitoids at mid-crustal conditions (Pernambuco shear zone, NE Brazil)
... in ultrafine-grained feldspathic layers deforming by diffusion creep, which in turn represents a viable mechanical explanation for strain localization in these polyphase ...
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Effect of Initial Microstructure on Superplasticity in Ultrafine Grained 18Cr 9Ni Stainless Steel
... metallic materials such as dual phase stainless steel 8,11) and Ti-Al-V system alloy 12) because it is important to keep grain size fine during the deformation at the elevated temperature for obtaining large ...
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Optimization of Microstructure and Mechanical Properties of Co Cr Mo Alloys by High Pressure Torsion and Subsequent Short Annealing
... This study was supported in part by a Grant-in-Aid for Sci- entific Research (A) No. 24246111 from the Japan Society for the Promotion of Science (JSPS) and the Inter-University Cooperative Research Program Innovation ...
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Formation of Ultrafine Grained Structure in Plain Carbon Steels Through Thermomechanical Processing
... Ultrafine grained structures in plain carbon steels are gaining in popularity amongst research groups around the World as means of cutting the cost of steel production and opening up the window of high band ...
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Pitting Corrosion Resistance of Ultrafine Grained Aluminum Processed by Severe Plastic Deformation
... metallic materials to the submicrometer range or even the nanometer range using the equal-channel angular pressing (ECAP) process is increas- ingly being studied with the aim of improving mechanical properties ...
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Hall Petch Relationship and Dislocation Model for Deformation of Ultrafine Grained and Nanocrystalline Metals
... This paper consists of two parts. In the fi rst part, several representative models to explain the HP relationship were reviewed. In the second part, recently developed dislocation bow-out and depinning model has been ...
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Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys
... subdivided by the martensitic transformation. The effective grain size of this martensite microstructure estimated from HAGBs was approximately 1 µm. Since the starting martensite structure had such a fine-grained ...
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Investigation of Physical Characteristics of Non-Structural Lightweight Aggregate Blocks
... Coarse-grained materials: natural and synthetic lightweight aggregates in lightweight aggregate concrete are used instead of coarse grains. Scoria of Sanandaj, Ghorveh mine with specific weight of 910 ...
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