Hardness anisotropy and active slip systems in a (Hf-Ta-Zr-Nb)C high-entropy carbide during nanoindentation

2021 ◽  
pp. 105646
Author(s):  
Tamás Csanádi ◽  
Vladimír Girman ◽  
Łukasz Maj ◽  
Jerzy Morgiel ◽  
Michael J. Reece ◽  
...  
Keyword(s):  
Slip Systems ◽  
High Entropy ◽  
Hardness Anisotropy ◽  
Active Slip

Temperature Dependence of the Yield Stress in α-Titanium Investigated with Crystal Plasticity Analysis

2018 ◽  
Vol 941 ◽  
pp. 1474-1478
Author(s):  
Yelm Okuyama ◽  
Masaki Tanaka ◽  
Tetsuya Ohashi ◽  
Tatsuya Morikawa
Keyword(s):  
Finite Element ◽  
Temperature Dependence ◽  
Yield Stress ◽  
Crystal Plasticity ◽  
Slip Systems ◽  
Temperature Dependent ◽  
Element Analysis ◽  
Pyramidal Slip ◽  
Active Slip ◽  
Lattice Friction

The effect of the activated slip systems on the temperature dependence of yield stress was investigated in α-Ti by using crystal plasticity finite element method. A model for finite element analysis (FEA) was constructed based on experimental results. The displacement in FEA was applied up to the nominal strain of 4% which is the same strain as the experimental one. Stress-strain curves were obtained, which corresponds to experimental data taken every 50 K between 73 K and 673 K. The used material constants which are temperature dependent were elastic constants, and lattice friction stresses. The lattice friction stresses of basal slip systems were set to be higher than that of pyramidal slip systems at 73 K. Then, the lattice friction stresses were set to be closer as the temperature increases. It was found that the activation of slip systems is strong temperature dependent, and that the yield stress depends on the number of active slip systems.

Effect of Rotation Relationship Between γ Grains on Compatibility of Deformation of Ti-A1 Alloys

1994 ◽  
Vol 364 ◽  
Author(s):  
M. A. Morris ◽  
J Luster
Keyword(s):  
Orientation Relationship ◽  
Theoretical Calculations ◽  
Specific Rotation ◽  
Experimental Results ◽  
Slip Systems ◽  
Active Deformation ◽  
Slip Transfer ◽  
Compatibility Factor ◽  
Geometric Compatibility ◽  
Active Slip

AbstractThe specific rotation relationships between adjacent γ grains have been measured in an alloy of composition Ti-47.5Al-2.5Cr consisting of lamellar and equiaxed distributions of γ grains in which the α2 phase was distributed as long lamellae or smaller globules respectively. Detailed analyses of active slip systems have been carried out by TEM observations of deformed samples and from these, the effect that specific rotations between γ grains have on the compatibility of deformation across adjacent grains has been discussed. Theoretical calculations of the geometric compatibility factor characterising the best slip transfer across adjacent grains have been used and compared to the experimental results. It has been possible to deduce the role played by the type of orientation relationship between grains in producing active deformation systems that allow the maximum compatibility of deformation.

Tensile Deformation of Magnesium and Magnesium Alloy Single Crystals

2014 ◽  
Vol 783-786 ◽  
pp. 341-345 ◽  
Author(s):  
Shinji Ando ◽  
Atsushi Kodera ◽  
Kazuki Fukushima ◽  
Masayuki Tsushida ◽  
Hiromoto Kitahara
Keyword(s):  
Single Crystals ◽  
Basal Slip ◽  
Tensile Deformation ◽  
Pure Magnesium ◽  
Slip Systems ◽  
Pyramidal Slip ◽  
Higher Temperature ◽  
Von Mises ◽  
Zn Alloy ◽  
Active Slip

According to von-Mises criterion, five kinds of independent slip systems are required for uniform deformation, so it is necessary to activate non-basal slip systems to show good ductility. However, it has not become clear the effect of Zn or Al for non-basal slip systems yet. To investigate deformation behavior of magnesium crystal by non-basal slip and alloying effect for the non-basal slip, pure magnesium and Mg-Al-Zn single crystals were stretched in the [110] direction. While {112}<23> second order pyramidal slip was activated at room temperature in pure magnesium, {101}<23> first order pyramidal slip became active slip at higher temperature. In Mg-Al-Zn alloy single crystal, {101} twin also activated by adding aluminum. These results indicate that active non-basal slip systems and twin in magnesium strongly depend on deformation temperature and alloying elements.

RELAXATION OF A MODEL IN FINITE PLASTICITY WITH TWO SLIP SYSTEMS

2013 ◽  
Vol 23 (11) ◽  
pp. 2111-2128 ◽  
Author(s):  
SERGIO CONTI ◽  
GEORG DOLZMANN ◽  
CAROLIN KREISBECK
Keyword(s):  
Three Dimensional ◽  
Material Behavior ◽  
Variational Model ◽  
Geometrically Nonlinear ◽  
Slip Systems ◽  
Two Dimensional ◽  
Finite Plasticity ◽  
Elasto Plasticity ◽  
Moduli Of Elasticity ◽  
Active Slip

The macroscopic material response of a variational model in geometrically nonlinear elasto-plasticity with two active slip systems, rigid elasticity, and hardening is determined. In particular, an explicit formula for the relaxation of the underlying energy density is given, both in the two-dimensional and a related three-dimensional setting. Finally, it is shown that the assumption of elastically rigid material behavior is justified since models with rigid elasticity can be obtained as Γ-limits of models with finite elastic energy for diverging moduli of elasticity.

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