scholarly journals Microscopic Evaluation of Plastic Deformation during Back-and-Forth Bending of Polycrystalline Pure Titanium Specimen with a Pair of Parallel Grooves Using Arranged Marks at Lattice Points

2013 ◽  
Vol 79 (800) ◽  
pp. 420-432
Author(s):  
Naoya TADA ◽  
Ichiro SHIMIZU
Keyword(s):  
Plastic Deformation ◽  
Pure Titanium ◽  
Lattice Points ◽  
Microscopic Evaluation ◽  
Titanium Specimen

Molecular Dynamics Modeling the Nano-Identation of Titanium

2021 ◽  
Author(s):  
Peiqiang Yang ◽  
Xueping Zhang ◽  
Zhenqiang Yao ◽  
Rajiv Shivpuri
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Titanium Alloys ◽  
Large Scale ◽  
Mechanical Response ◽  
Pure Titanium ◽  
Dynamics Modeling ◽  
Dynamics Model ◽  
Nano Indentation ◽  
Molecular Dynamics Modeling

Abstract Titanium alloys’ excellent mechanical and physical properties make it the most popular material widely used in aerospace, medical, nuclear and other significant industries. The study of titanium alloys mainly focused on the macroscopic mechanical mechanism. However, very few researches addressed the nanostructure of titanium alloys and its mechanical response in Nano-machining due to the difficulty to perform and characterize nano-machining experiment. Compared with nano-machining, nano-indentation is easier to characterize the microscopic plasticity of titanium alloys. This research presents a nano-indentation molecular dynamics model in titanium to address its microstructure alteration, plastic deformation and other mechanical response at the atomistic scale. Based on the molecular dynamics model, a complete nano-indentation cycle, including the loading and unloading stages, is performed by applying Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). The plastic deformation mechanism of nano-indentation of titanium with a rigid diamond ball tip was studied under different indentation velocities. At the same time, the influence of different environment temperatures on the nano-plastic deformation of titanium is analyzed under the condition of constant indentation velocity. The simulation results show that the Young’s modulus of pure titanium calculated based on nano-indentation is about 110GPa, which is very close to the experimental results. The results also show that the mechanical behavior of titanium can be divided into three stages: elastic stage, yield stage and plastic stage during the nano-indentation process. In addition, indentation speed has influence on phase transitions and nucleation of dislocations in the range of 0.1–1.0 Å/ps.

The Effect of Strain Rate on the Plastic Deformation Mode of CP-Ti during Surface Nanocrystallization

2011 ◽  
Vol 675-677 ◽  
pp. 239-242
Author(s):  
Chun Huan Chen ◽  
Cheng Jin ◽  
Rui Ming Ren
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Strain Rate ◽  
Shot Peening ◽  
Pure Titanium ◽  
Deformation Mode ◽  
Rate Variation ◽  
Commercially Pure Titanium ◽  
Surface Nanocrystallization ◽  
Cp Ti

The effect of the strain rate on the surface nanocrystallization of titanium is investigated both theoretically and experimentally in this paper. The strain rate variation and stress distribution from surface to the interior of titanium during shot peening are estimated firstly using finite element method. Then shot peening experiment is carried out on a commercially pure titanium (CP-Ti) plate, and the obtained surface microstructures is characterized by transmission electron microscopy (TEM). Combining theoretical simulations and experimental observations, the effect of strain rate on the strain accommodation mechanism and plastic deformation mode are discussed. It is concluded that the strain rate and stress achieve the highest at the top surface layer of CP-Ti, and the strain rate decrease dramatically from the surface to the interior. The strain rate at the top surface layer is up to 104 s-1, which leads to superplastic deformation of Ti. There is no mechanical twin in the surface layer, instead, deformation lamella and adiabatic shear bands are the dominating microstructures. By means of rotation recrystallization, those deformation bands evolve to nanocrystallines.

ELECTRICAL RESISTIVITY OF PURE TITANIUM AFTER SEVERE PLASTIC DEFORMATION AS A FUNCTION OF TEMPERATURE

2015 ◽  
Vol 0 (3) ◽  
pp. 5-5
Author(s):  
V.V. Berezovsky ◽  
◽  
O.K. Bazaleeva ◽  
V.S. Kalashnikov ◽  
◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Electrical Resistivity ◽  
Severe Plastic Deformation ◽  
Pure Titanium

A Numerical Investigation of a Single-Shot Impact Effects on Plastic Deformation of Titanium Alloys

2021 ◽  
Vol 105 ◽  
pp. 119-124
Author(s):  
Eser Yarar ◽  
A. Tamer Erturk
Keyword(s):  
Plastic Deformation ◽  
Pure Titanium ◽  
Impact Behavior ◽  
Surface Mechanical Attrition Treatment ◽  
Rigid Sphere ◽  
Single Shot ◽  
Commercially Pure Titanium ◽  
The Finite Element Method ◽  
Mechanical Attrition ◽  
Explicit Dynamic

Surface mechanical attrition treatment is a pre-stressing process that enhances the lifespan of mechanical parts. The experimental evaluation of SMAT parameters is not only very complex but also costly. In this study, the single impact behavior of commercially pure titanium and Ti6Al4V alloys is analyzed using the finite element method. For simulating the single-shot impact process, a rigid sphere on a rectangular component is modeled using ANSYS/AUTODYN explicit dynamic solver. The effects of single-shot impact on the induced compressive residual stress and plastic deformation were investigated. Besides, the change in shot velocity after a single shot was revealed by calculating the restitution coefficient, and its relation to plastic deformation was investigated.

Molecular Dynamics Simulation of Plastic Deformation of Pure Titanium Under Shock Loading

2016 ◽  
Vol 43 (8) ◽  
pp. 0802014
Author(s):  
陈亚洲 Chen Yazhou ◽  
周留成 Zhou Liucheng ◽  
何卫锋 He Weifeng ◽  
罗思海 Luo Sihai ◽  
焦阳 Jiao Yang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Molecular Dynamics Simulation ◽  
Shock Loading ◽  
Pure Titanium ◽  
Dynamics Simulation
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