scholarly journals Structural stability and energetics of grain boundary triple junctions in face centered cubic materials

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
I. Adlakha ◽  
K. N. Solanki
Keyword(s):  
Grain Boundary ◽  
Structural Stability ◽  
Face Centered Cubic ◽  
Triple Junctions ◽  
Cubic Materials ◽  
Boundary Triple ◽  
Face Centered

scholarly journals Effects of Different Contents of Each Component on the Structural Stability and Mechanical Properties of Co-Cr-Fe-Ni High-Entropy Alloys

2021 ◽  
Vol 11 (6) ◽  
pp. 2832
Author(s):  
Haibo Liu ◽  
Cunlin Xin ◽  
Lei Liu ◽  
Chunqiang Zhuang
Keyword(s):  
Mechanical Properties ◽  
Structural Stability ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
Obvious Effect ◽  
High Entropy ◽  
Precise Control ◽  
Component Content ◽  
Face Centered ◽  
And Performance

The structural stability of high-entropy alloys (HEAs) is closely related to their mechanical properties. The precise control of the component content is a key step toward understanding their structural stability and further determining their mechanical properties. In this study, first-principle calculations were performed to investigate the effects of different contents of each component on the structural stability and mechanical properties of Co-Cr-Fe-Ni HEAs based on the supercell model. Co-Cr-Fe-Ni HEAs were constructed based on a single face-centered cubic (FCC) solid solution. Elemental components have a clear effect on their structure and performance; the Cr and Fe elements have an obvious effect on the structural stability and equilibrium lattice constant, respectively. The Ni elements have an obvious effect on stiffness. The Pugh ratios indicate that Cr and Ni addition may increase ductility, whereas Co and Fe addition may decrease it. With increasing Co and Fe contents or decreasing Cr and Ni contents, the structural stability and stiffness of Co-Cr-Fe-Ni HEAs are improved. The structural stability and mechanical properties may be related to the strength of the metallic bonding and covalent bonding inside Co-Cr-Fe-Ni HEAs, which, in turn, is determined by the change in element content. Our results provide the underlying insights needed to guide the optimization of Co-Cr-Fe-Ni HEAs with excellent mechanical properties.

Wandering and nanolaminated structures of grain boundary triple junctions in tungsten

2020 ◽  
Vol 260 ◽  
pp. 126980
Author(s):  
T.I. Mazilova ◽  
E.V. Sadanov ◽  
I.V. Starchenko ◽  
I.M. Mikhailovskij
Keyword(s):  
Grain Boundary ◽  
Triple Junctions ◽  
Boundary Triple

Hall-Petch Basis for Assessing Alloy Strengthening

1994 ◽  
Vol 362 ◽  
Author(s):  
Ronald W. Armstrong ◽  
R. Michael Douthwaite
Keyword(s):  
Grain Boundary ◽  
Alloy Composition ◽  
Friction Stress ◽  
Face Centered Cubic ◽  
Square Root ◽  
Petch Relation ◽  
Face Centered ◽  
Al Mg Alloys ◽  
Zn Alloys ◽  
Grain Boundary Strengthening

AbstractThe Hall-Petch relation σ = σo + kl−½, provides for the separate consideration of friction stress strengthening within the polycrystal grain volumes through σo and grain boundary strengthening through the product of the microstructural stress intensity k and the reciprocal square root of the grain diameter l Smaller grain diameters are normally obtained at higher alloy contents as illustrated for yield strength results reported for different face-centered-cubic Al-Mg alloys. Results on Al-Li alloy give an interesting example of substantial grain boundary strengthening that is associated with reduced ductility of the material. More complete results reported for the Cu-Al system, allow an evaluation of the strengthening component dependencies on alloy composition, in particular, connecting with a predicted square root of grain boundary obstacle stress in k. The much studied Cu-Zn alloys bring out subtle changes in σo and k

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