Improving the tensile ductility and uniform elongation of high-strength ultrafine-grained Al alloys by lowering the grain boundary misorientation angle

2014 ◽  
Vol 78-79 ◽  
pp. 25-28 ◽  
Author(s):  
T. Hu ◽  
K. Ma ◽  
T.D. Topping ◽  
B. Saller ◽  
A. Yousefiani ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Misorientation Angle ◽  
Tensile Ductility ◽  
Uniform Elongation ◽  
High Strength ◽  
Al Alloys ◽  
Boundary Misorientation ◽  
Ultrafine Grained ◽  
Grain Boundary Misorientation

scholarly journals The Effects of Grain Boundary Misorientation on the Mechanical Properties and Mechanism of Plastic Deformation of Ni/Ni3Al: A Molecular Dynamics Study

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5715
Author(s):  
Jun Ding ◽  
Sheng-Lai Zhang ◽  
Quan Tong ◽  
Lu-Sheng Wang ◽  
Xia Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Grain Boundary ◽  
Misorientation Angle ◽  
Interfacial Energy ◽  
Stacking Faults ◽  
Boundary Misorientation ◽  
Grain Boundary Misorientation ◽  
Mechanisms Of Plastic Deformation

The effects of grain boundary misorientation angle (θ) on mechanical properties and the mechanism of plastic deformation of the Ni/Ni3Al interface under tensile loading were investigated using molecular dynamics simulations. The results show that the space lattice arrangement at the interface is dependent on grain boundary misorientations, while the interfacial energy is dependent on the arrangement. The interfacial energy varies in a W pattern as the grain boundary misorientation increases from 0° to 90°. Specifically, the interfacial energy first decreases and then increases in both segments of 0–60° and 60–90°. The yield strength, elastic modulus, and mean flow stress decrease as the interfacial energy increases. The mechanism of plastic deformation varies as the grain boundary misorientation angle (θ) increases from 0° to 90°. When θ = 0°, the microscopic plastic deformation mechanisms of the Ni and Ni3Al layers are both dominated by stacking faults induced by Shockley dislocations. When θ = 30°, 60°, and 80°, the mechanisms of plastic deformation of the Ni and Ni3Al layers are the decomposition of stacking faults into twin grain boundaries caused by extended dislocations and the proliferation of stacking faults, respectively. When θ = 90°, the mechanisms of plastic deformation of both the Ni and Ni3Al layers are dominated by twinning area growth resulting from extended dislocations.

scholarly journals Investigation on the Effects of Grain Boundary on Deformation Behavior of Bicrystalline Pillar by Crystal Plasticity Finite Element Method

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 923
Author(s):  
Hui Zhou ◽  
Pei Wang ◽  
Shanping Lu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dislocation Density ◽  
Grain Boundary ◽  
Misorientation Angle ◽  
Deformation Behavior ◽  
Boundary Misorientation ◽  
Crystal Orientations ◽  
Grain Boundary Misorientation ◽  
Element Method

A dislocation density–grain boundary interaction scheme coupled with the dislocation density-based crystalline plasticity finite element method has been established and used to investigate the deformation behavior of bicrystalline pillars with the same grain boundary misorientation angle but different crystal orientations. It is found that the angle between the activated slip systems, which is determined by the crystal orientations, rather than the grain boundary misorientation angle, influences the interactions between the plastic slip and the grain boundary, which further influence the heterogeneous deformation of bicrystalline specimens.

Effect of grain boundary misorientation angle on diffusion behavior in molybdenum-tungsten systems

2020 ◽  
Vol 819 ◽  
pp. 152975 ◽  
Author(s):  
Yupeng Hao ◽  
Chengwen Tan ◽  
Xiaodong Yu ◽  
Rong Chen ◽  
Zhihua Nie ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Misorientation Angle ◽  
Boundary Misorientation ◽  
Diffusion Behavior ◽  
Grain Boundary Misorientation
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