Neutron diffraction studies on lattice strain evolution around a crack-tip during tensile loading and unloading cycles

2005 ◽  
Vol 53 (8) ◽  
pp. 971-975 ◽  
Author(s):  
Yinan Sun ◽  
Hahn Choo ◽  
Peter K. Liaw ◽  
Yulin Lu ◽  
Bing Yang ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Lattice Strain ◽  
Crack Tip ◽  
Tensile Loading ◽  
Strain Evolution ◽  
Loading And Unloading

scholarly journals Texture and Lattice Strain Evolution during Tensile Loading of Mg–Zn Alloys Measured by Synchrotron Diffraction

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 124
Author(s):  
Xiaohua Zhou ◽  
Changwan Ha ◽  
Sangbong Yi ◽  
Jan Bohlen ◽  
Norbert Schell ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Basal Slip ◽  
Lattice Strain ◽  
Tensile Loading ◽  
Tensile Tests ◽  
Vital Role ◽  
Prismatic Slip ◽  
Synchrotron Diffraction ◽  
Strain Evolution ◽  
Zn Alloys

To explore the effect of neodymium (Nd) on the deformation mechanisms of Mg–Zn alloys, texture and lattice strain developments of hot-rolled Mg–Zn (Z1) and Mg–Zn–Nd (ZN10) alloys were investigated using in situ synchrotron diffraction and compared with elasto-viscoplastic self-consistent simulation under tensile loading. The Nd-containing ZN10 alloys show much weaker texture after hot rolling than the Nd-free Z1 alloy. To investigate the influence of the initial texture on the texture and lattice strain evolution, the tensile tests were carried out in the rolling and transverse direction. During tension, the {002}<100> texture components develop fast in Z1, which was not seen for ZN10. On the other hand, <100> fiber // loading direction (LD) developed in both alloys, although it was faster in ZN10 than in Z1. Lattice strain investigation showed that <101> // LD-oriented grains experienced plastic deformation first during tension, which can be related to basal slip activity. This was more apparent for ZN10 than for Z1. The simulation results show that the prismatic slip plays a vital role in the plastic deformation of Z1 directly from the beginning. In contrast, ZN10 plastic deformation starts with dominant basal slip but during deformation prismatic slip becomes increasingly important.

scholarly journals Lattice strain evolution during uniaxial tensile loading of stainless steel

1999 ◽  
Vol 259 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Bjørn Clausen ◽  
Torben Lorentzen ◽  
Mark A.M. Bourke ◽  
Mark R. Daymond
Keyword(s):  
Stainless Steel ◽  
Lattice Strain ◽  
Tensile Loading ◽  
Uniaxial Tensile ◽  
Strain Evolution ◽  
Uniaxial Tensile Loading

In situlattice strain mapping during tensile loading using the neutron transmission and diffraction methods

2012 ◽  
Vol 45 (1) ◽  
pp. 113-118 ◽  
Author(s):  
Kenji Iwase ◽  
Hirotaka Sato ◽  
Stefanus Harjo ◽  
Takashi Kamiyama ◽  
Takayoshi Ito ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Lattice Strain ◽  
Tensile Deformation ◽  
Tensile Loading ◽  
Applied Force ◽  
Strain Mapping ◽  
Neutron Transmission ◽  
Iron Plate ◽  
Position Dependence

In this study, the change in internal lattice strain in an iron plate during tensile deformation was investigated by performingin situmeasurements under applied force. The lattice strain was evaluated by neutron diffraction and Bragg-edge transmission. The neutron diffraction results showed that the averaged 110 lattice strain along the direction perpendicular to the applied force was between −422 and −109 × 10−6. The position dependence of the lattice strain and the change in the distribution of elastic strain in an iron plate with notches during tensile deformation was obtained by Bragg-edge transmission. It was also observed that, when the load increased over 30 kN, the area of plastic deformation increased around the positions of the notches.

D-53 Changes in Elastic Strain Profiles Around a Crack Tip During Tensile Loading and Unloading Cycles

2004 ◽  
Vol 19 (2) ◽  
pp. 199-199
Author(s):  
Y. Sun ◽  
P. K. Liaw ◽  
Y. L. Lu ◽  
B. Yang ◽  
H. Choo ◽  
...  
Keyword(s):  
Elastic Strain ◽  
Crack Tip ◽  
Tensile Loading ◽  
Loading And Unloading

Intergranular Strain Evolution in Titanium During Tensile Loading: Neutron Diffraction and Polycrystalline Model

2015 ◽  
Vol 46 (11) ◽  
pp. 5038-5046 ◽  
Author(s):  
David Gloaguen ◽  
Guy Oum ◽  
Vincent Legrand ◽  
Jamal Fajoui ◽  
Marie-José Moya ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Tensile Loading ◽  
Strain Evolution ◽  
Intergranular Strain ◽  
Polycrystalline Model

Probing Mesoscopic Strain Evolution during Creep Deformation: An In-Situ Neutron Diffraction Study

2004 ◽  
Vol 840 ◽  
Author(s):  
Hahn Choo ◽  
Donald W. Brown ◽  
Mark A. M. Bourke ◽  
Robert W. Swindeman
Keyword(s):  
Neutron Diffraction ◽  
Creep Deformation ◽  
Lattice Strain ◽  
Dislocation Creep ◽  
Secondary Creep ◽  
Direction Parallel ◽  
Strain Evolution ◽  
Lattice Strains ◽  
Creep Regime

ABSTRACTThe development of lattice strain was studied using in-situ time-of-flight neutron diffraction during constant-load tensile creep deformation of an austenitic 316FR stainless steel at 180, 240, and 300MPa at 873K (a power-law creep regime) with time resolution of 900 seconds. The macroscopic (global) and mesoscopic (lattice) strains were measured simultaneously during creep using an extensometer and neutron diffraction, respectively. The hkl-specific lattice strains were measured to gain insights into the plastic anisotropy at various stages of creep deformation (i.e., primary, secondary, and tertiary regimes). Furthermore, the creep-induced lattice strain behavior was compared to the result obtained from a quasistatic tension test at 873K. The lattice strain evolution in the axial direction (direction parallel to the tensile loading axis) during the primary and secondary creep (dislocation creep) is quite similar to the quasistatic case (slip). However, in the tertiary creep regime, the creep-induced lattice strain accumulation is smaller than the quasistatic case at a given total strain, except the (111) reflection.

Modeling lattice strain evolution during uniaxial deformation of textured Zircaloy-2

2008 ◽  
Vol 56 (14) ◽  
pp. 3672-3687 ◽  
Author(s):  
F. Xu ◽  
R.A. Holt ◽  
M.R. Daymond
Keyword(s):  
Lattice Strain ◽  
Uniaxial Deformation ◽  
Strain Evolution

scholarly journals Crystal Plasticity Analysis of Stress Partitioning Mechanisms and Their Microstructural Dependence in Advanced Steels

2015 ◽  
Vol 82 (3) ◽  
Author(s):  
Chao Pu ◽  
Yanfei Gao
Keyword(s):  
Crystal Plasticity ◽  
Lattice Strain ◽  
Martensite Phase ◽  
Geometric Constraints ◽  
High Yield ◽  
Uniaxial Tensile ◽  
Hard Phase ◽  
Ductile Phase ◽  
Strain Evolution ◽  
Stress Partitioning

Two-phase advanced steels have an optimized combination of high yield strength and large elongation strain at failure, as a result of stress partitioning between a hard phase (martensite) and a ductile phase (ferrite or austenite). Provided with strong interfaces between the constituent phases, the failure in the brittle martensite phase will be delayed by the surrounding geometric constraints, while the rule of mixture will dictate a large strength of the composite. To this end, the microstructural design of these composites is imperative especially in terms of the stress partitioning mechanisms among the constituent phases. Based on the characteristic microstructures of dual phase and multilayered steels, two polycrystalline aggregate models are constructed to simulate the microscopic lattice strain evolution of these materials during uniaxial tensile tests. By comparing the lattice strain evolution from crystal plasticity finite element simulations with advanced in situ diffraction measurements in literature, this study investigates the correlations between the material microstructure and the micromechanical interactions on the intergranular and interphase levels. It is found that although the applied stress will be ultimately accommodated by the hard phase and hard grain families, the sequence of the stress partitioning on grain and phase levels can be altered by microstructural designs. Implications of these findings on delaying localized failure are also discussed.

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