scholarly journals Determination of static fracture toughness of coarse-grained and ultrafine-grained materials by the depth of the plastic zone under the fractures surface

2021 ◽  
Vol 11 (1) ◽  
pp. 45-49
Author(s):  
Gennady Klevtsov ◽  
Ruslan Valiev ◽  
Natalya Klevtsova ◽  
Irina Pigaleva
Keyword(s):  
Fracture Toughness ◽  
Plastic Zone ◽  
Coarse Grained ◽  
Ultrafine Grained ◽  
Static Fracture ◽  
Ultrafine Grained Materials

Application of Nuclear Gamma-Resonance Spectroscopy for Determination of Grain-Boundary Diffusion Characteristics and the State of Grain Boundaries

2019 ◽  
Vol 391 ◽  
pp. 201-214
Author(s):  
Vladimir V. Popov
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Coarse Grained ◽  
Resonance Spectroscopy ◽  
Diffusion Parameters ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials

Capabilities of application of Mössbauer spectroscopy for determination of grain-boundary diffusion parameters in coarse-grained and ultrafine-grained materials have been analyzed. Application of this method for revealing of non-equilibrium state of grain boundaries in ultrafine-grained materials obtained by severe plastic deformation is demonstrated.

Measures of Ductility for UFG Materials Obtained by SPD

2009 ◽  
Vol 633-634 ◽  
pp. 223-230 ◽  
Author(s):  
Yan Beygelzimer ◽  
O. Prokof'eva ◽  
R. Kulagin ◽  
Viktor Varyukhin ◽  
Sergey Synkov
Keyword(s):  
Plastic Deformation ◽  
Coarse Grained ◽  
Alloy Structure ◽  
Commercial Grade ◽  
Ultrafine Grained ◽  
Twist Extrusion ◽  
Coarse Grained State ◽  
Ultrafine Grained Materials ◽  
Reduction Of Area ◽  
Discontinuity Flaws

It is shown that for ultrafine grained materials obtained with severe plastic deformation methods, the value of elongation up to fracture does not determine ductility, while the reduction of area up to fracture does determine it. The latter characteristic gives information about how an alloy structure resists the formation of discontinuity flaws under deformation in a hard stress state. We show that for a commercial grade titanium that underwent Twist Extrusion (TE), the value of , and thus ductility, is higher in the UFG state than in the coarse-grained state.

Mechanical Behaviors of Ultrafine Grained Metallic Materials

2007 ◽  
Vol 124-126 ◽  
pp. 1325-1328
Author(s):  
Dong Hyuk Shin ◽  
Duck Young Hwang ◽  
Jung Yong Ahn ◽  
Kyung Tae Park ◽  
Yong Suk Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Coarse Grained ◽  
Metallic Materials ◽  
Room Temperature Ductility ◽  
Ultrafine Grained ◽  
Superior Mechanical Properties ◽  
Ultrafine Grained Materials ◽  
The Relationship

Ultrafine grained materials fabricated by severe plastic deformation exhibit both superior and inferior mechanical properties, as the prominent structural materials, compared to coarse grained counterparts. The superior mechanical properties are ultrahigh strength and exceptional ductility at high temperatures (i.e., superplasticity). The inferior mechanical properties are lack of strain hardenability and room temperature ductility. In this study, the relationship between microstructure and mechanical properties of ultrafine grained materials fabricated by severe plastic deformation is investigated in order to provide insight broadening their future applicability.

Determination of the size of structural elements in ultrafine grained materials

2011 ◽  
Vol 47 (15) ◽  
pp. 1687-1688
Author(s):  
V. A. Popov ◽  
A. V. Sisanbaev ◽  
V. N. Danilenko
Keyword(s):  
Structural Elements ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials

Diffusion in Ultrafine Grained Materials

2008 ◽  
Vol 584-586 ◽  
pp. 1012-1017 ◽  
Author(s):  
Sergiy V. Divinski ◽  
Gerhard Wilde
Keyword(s):  
Grain Boundaries ◽  
Short Circuit ◽  
High Mobility ◽  
Coarse Grained ◽  
Kinetic Properties ◽  
Fine Grained ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Diffusion Rates ◽  
Short Circuit Diffusion

The paper provides an overview of recent results of the radiotracer investigations of short-circuit diffusion in ultra fine grained (UFG) materials produced by severe plastic deformation (SPD). Different material classes (copper of different purity levels and Cu alloys) are considered. The study is focused on the existence of non-equilibrium grain boundaries after SPD. Although a dominant contribution of common high-angle grain boundaries with very similar diffusivities as those in the corresponding coarse-grained material is established, much faster diffusion rates are also observed experimentally. The nature and kinetic properties of these “high mobility” paths in different materials are investigated and critically discussed.

scholarly journals Determination of Static Fracture Toughness of Nettle Fibre (Urtica Dioica)/Polymethyl-methacrylate Composites Using Different Fracture Methods

Mechanika ◽  
2020 ◽  
Vol 26 (2) ◽  
pp. 95-102
Author(s):  
Kenan Büyükkaya ◽  
Faruk Güner
Keyword(s):  
Fracture Toughness ◽  
Bending Strength ◽  
Tensile Tests ◽  
Compact Tension ◽  
Fibre Reinforcement ◽  
Bending Stresses ◽  
Static Fracture ◽  
Compact Tension Test ◽  
Point Bend

In this study, the breaking behaviour of polymethylmethacrylate reinforced with nettle fibre was investigated experimentally. Single edge notched bending (SENB) and compact test(CT)  specimens were produced to include notches in various ratios. The Mode I fracture behaviour of samples were determined utilizing static frac-ture toughness experiments such as the Three Point Bend-ing (TPB) and Compact Tensile tests. The fracture tough-ness (KIC) was investigated using the TPB Test (Compli-ance and Initial notch method), and Compact Tension test. The bending module and bending stresses were also determined. It was found that nettle-fibre reinforcement improves the bending strength of the composite by 60% and improves the fracture toughness more than two-fold.

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