scholarly journals Influence of Co substitution on magnetostriction and on Young's modulus of Fe-Ga alloy single crystal

2015 ◽  
Author(s):  
S. Fujieda ◽  
R. Ukai ◽  
Y. Onuki ◽  
S. Suzuki ◽  
T. Fukuda
Keyword(s):  
Single Crystal ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Alloy Single Crystal ◽  
Co Substitution

Significant reduction in Young's modulus of Fe–Ga alloy single crystal by inverse magnetostrictive effect under tensile stress

2018 ◽  
Vol 124 (23) ◽  
pp. 233901 ◽  
Author(s):  
S. Fujieda ◽  
S. Asano ◽  
S. Hashi ◽  
K. Ishiyama ◽  
T. Fukuda ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Single Crystal ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Alloy Single Crystal

Effect of Phase Stability on Some Physical and Mechanical Properties in β-Ti Single Crystal for Biomedical Applications

2014 ◽  
Vol 783-786 ◽  
pp. 1372-1376 ◽  
Author(s):  
Mitsuharu Todai ◽  
Pan Wang ◽  
Keisuke Fukunaga ◽  
Takayoshi Nakano
Keyword(s):  
Physical Properties ◽  
Single Crystal ◽  
Young’S Modulus ◽  
Phase Stability ◽  
Young's Modulus ◽  
Physical And Mechanical Properties ◽  
Elastic Stiffness ◽  
Alloy Single Crystal ◽  
Β Phase ◽  
Ti Alloys

The electron-atom ratio (e/a) dependence of the appearance of the lattice modulation and physical properties in β-phase Ti-xNb alloys (x= 28, 30, 34 and 40) were investigated by using some physical properties measurements, compressive test and transmission electron microscope observations (TEM observations), focusing on the β-phase stability. The microstructure, physical properties, deformation mode depend on thee/aratio which is closely related to the β-phase stability in Ti-Nb alloys. Thee/aratio is defined by the average electrons per atom in free atom configuration. Athermal ω-phase is suppressed in Ti-30Nb alloy single crystal with lowe/aratio. The Ti-30Nb alloy single crystal also exhibits a lattice modulation and low Debye temperature. These results imply that the β-phase stability in β-phase Ti alloys decreases with decreasing thee/aratio and are related to the softening of elastic stiffness,c′. Consequently, a decrease in thee/aratio leads to the softening ofc′ and a significant reduction in modulus along the [100] direction in β-phase Ti alloys single crystal. In fact, the Young’s modulus along [100] of the Ti-15Mo-5Zr-3Al alloy (wt.%) single crystal with lowe/aratio exhibits as low as 45 GPa, which is comparable to that the human cortical bone. That is, controlling thee/aratio is an ultimate strategy to develop the future superior biocompatible implant materials with extremely low Young’s modulus and good deformability.

Determination of single-crystal elastic constants from a cubic polycrystalline aggregate

1985 ◽  
Vol 18 (6) ◽  
pp. 513-518 ◽  
Author(s):  
M. Hayakawa ◽  
S. Imai ◽  
M. Oka
Keyword(s):  
Single Crystal ◽  
Young’S Modulus ◽  
Elastic Constants ◽  
Young's Modulus ◽  
Polycrystalline Aggregate ◽  
X Ray ◽  
Cubic Stiffness

A method for determining cubic stiffness constants from polcrystalline Young's modulus and X-ray elastic constants is described. The relations used among these elastic constants are those based on Kröner's quasiisotropic model. The X-ray elastic constants required [S1(hkl)] are obtained by measuring various (hkl) d spacings of a stressed specimen under symmetric θ–2θ scan mode. An application to an Fe–31Ni alloy has given the results: C 11 = 1.47, C 12 = 1.05 and C 44 = 1.24 × 1011 Pa.

Finite Element Analysis of Cylindrical Inclusions in Polycrystalline Nickel Alloys

2018 ◽  
Vol 09 (02) ◽  
pp. 1850003
Author(s):  
E. A. Bonifaz ◽  
A. Alban ◽  
A. Czekanski
Keyword(s):  
Finite Element ◽  
Single Crystal ◽  
Young’S Modulus ◽  
Applied Load ◽  
Elastic Limit ◽  
Young's Modulus ◽  
The Matrix ◽  
Cylindrical Inclusions ◽  
The Difference ◽  
Curve Extension

Inspired by nanotubes, a 3D finite element model was developed to simulate the influence of cylindrical inclusions on the polycrystalline mechanical behavior of Nickel alloys. A dislocation based strain hardening model, constructed in the so-called Kocks–Mecking framework, is used as the main strategy for the constitutive modeling of individual bulk grains. To determine the influence of the inclusions distribution, the direction of applied load and the size of the matrix phase on the inelastic stress–strain distribution, the digital microstructure code DREAM.3D was coupled to ABAQUS[Formula: see text] finite element code through a MatLab[Formula: see text] program. Four affordable computational representative volume elements (RVEs) meshes of two different edge sizes and two different inclusion distributions were tested to investigate the relation between micro and macro deformation and stress variables. The virtual specimens, subjected to continuous monotonic strain loading conditions, were constrained with random periodic boundary conditions. The difference in crystallographic orientation, which evolves in the process of straining, and the incompatibility of deformation between neighboring grains were accounted for by the introduction of single crystal averaged Taylor factors, single crystal Young’s modulus, single phase elastic modulus and the evolution of geometrically necessary dislocation density. The effects of single crystal Young’s modulus, inclusion distribution and direction of the applied load upon the aggregate local response are clearly observed. Results demonstrate a strong dependence of flow stress and plastic strain on phase type, Young’s modulus values and direction of the applied load, but slightly on matrix grain size. The stress–strain curve extension and the variation in the elastic limit of the individual inclusions depend on the inclusion-matrix Young’s modulus difference and applied load direction. The difference in curve extension and the difference in elastic limit decrease as the Young’s modulus of the single crystal inclusion approach the Young’s modulus of the matrix majoritary phase, while the resistance to flow increases when the applied load is perpendicular to the inclusion longitudinal axis.

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