Monotonic and cyclic behavior of the nitrogen ion-implanted commercially pure-titanium

2021 ◽  
Vol 15 (1) ◽  
pp. 7662-7670
Author(s):  
N. Ali ◽  
M.S. Mustapa ◽  
T. Sujitno ◽  
T.E. Putra ◽  
Husaini .
Keyword(s):  
Material Properties ◽  
Room Temperature ◽  
Pure Titanium ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Cyclic Behavior ◽  
Strain Hardening Exponent ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Nitrogen Ion

This research aims to study the behavior of monotonic and cyclic plastic deformation on commercially pure titanium which has undergone surface treatment using the nitrogen ion implantation method. The doses of 2.0×1017 ions/cm2 and the energy of 100 keV were used to implant the nitrogen ions into the CpTi. Monotonic properties tests were performed in a laboratory air and at room temperature using ASTM E8 standard specimens. Fatigue and corrosion fatigue tests were conducted in a laboratory  air and in artificial saline solutions, at room temperature using ASTM 1801-97 specimens. Tensile tests were carried out with constant displacement rate and fatigue tests were carried under fully-reversed with stress-controlled conditions with stress amplitudes 230, 240, 250, 260, 270 and 280 MPa. The results showed the material properties of monotonic behavior for CpTi and Nii-Ti; tensile strength (σu) of 497 and 539 MPa and for 0.2% offset yield strength (σy) of 385 and 440 MPa, respectively and of cyclic behavior; cyclic strength coefficient (k’) of 568.41 and 818.64 and cyclic strain hardening exponent (n’) of 0.176 and 0.215, respectively. This study has succeeded in producing useful new material properties that will contribute to the field of material science and engineering.

Improvement in Ductility in Commercially Pure Titanium Alloys by Stress Relaxation at Room Temperature

2014 ◽  
Vol 611-612 ◽  
pp. 92-98 ◽  
Author(s):  
Irena Eipert ◽  
Giribaskar Sivaswamy ◽  
Rahul Bhattacharya ◽  
Muhammad Amir ◽  
Paul Blackwell
Keyword(s):  
Stress Relaxation ◽  
Titanium Alloys ◽  
Yield Point ◽  
Room Temperature ◽  
Pure Titanium ◽  
Tensile Tests ◽  
Tensile Behaviour ◽  
Strain Rates ◽  
Commercially Pure Titanium ◽  
Commercially Pure

Present work focusses on the effect of stress relaxation on the tensile behaviour of two commercially pure titanium alloys of different strength levels (Grade 1 and Grade 4) subjected to tensile tests at room temperature. The stress relaxation tests were performed by interrupting the tensile tests at regular strain intervals of 5% in the plastic region of the tensile curve and compared to the monotonic tensile tests at different strain rates ranging from 10-4to 10-1s-1. To understand the effect of anisotropy, samples were taken along 0° and 90° to rolling direction (RD) for both the alloys. Improvement in ductility of different levels at all the strain rates was observed in both the alloys when stress relaxation steps were introduced as compared to monotonic tests. However there is not much change in the flow stress as well as in strain hardening behaviour of the alloys. The true stress-true strain curves of Grade 4 samples taken in 90° to RD exhibited discontinuous yielding phenomenon after the yield point, which is termed as a yield-point elongation (YPE). The improvement in ductility of the Cp-Ti alloys can be linked to recovery process occurring during the stress relaxation steps which resulted in the improvement in ductility after repeated interrupted tensile tests. The paper presents and summarise the results based on the stress relaxation for the two different alloys.

The effect of molybdenum on titanium’s castability in dental prosthesis applications: A numerical analysis

2018 ◽  
Vol 233 (10) ◽  
pp. 1966-1971 ◽  
Author(s):  
Volkan Kovan ◽  
Tugce Tezel ◽  
Eyup Sabri Topal
Keyword(s):  
Room Temperature ◽  
Pure Titanium ◽  
Low Density ◽  
Metallic Materials ◽  
Commercially Pure Titanium ◽  
High Melting ◽  
Dental Prostheses ◽  
High Melting Temperature ◽  
Commercially Pure ◽  
Potential Use

The ISO 22674 standard categorizes metallic materials that are suitable for dental appliances and restoration fabrication. Nickel, cadmium, and beryllium are classified as hazardous elements in this international standard. However, many alloys containing nickel and beryllium are used in dentistry as biomedical metallic materials. Numerous studies on the toxicity of nickel and beryllium have led to serious doubts about the biological reliability of these alloys. Titanium therefore attracts great interest due to its potential use in dental prostheses. Commercially pure titanium has biocompatibility, low density, great corrosion resistance, and mechanical strength at room temperature. In spite of its numerous desirable properties, it is hard to cast titanium because of its high melting temperature. In this study, the microstructure and castability of binary Ti–Mo alloys (2%, 4%, 6%, 8%) was investigated using numerical methods to evaluate their potential use in dentistry. ProCAST software was used to model the casting behavior.

Processing by Hydrostatic Extrusion of Titanium Coated with Aluminides

2006 ◽  
Vol 114 ◽  
pp. 63-68 ◽  
Author(s):  
Halina Garbacz ◽  
Wacław Pachla ◽  
Tadeusz Wierzchoń ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Glow Discharge ◽  
Room Temperature ◽  
Pure Titanium ◽  
Hydrostatic Extrusion ◽  
Commercially Pure Titanium ◽  
Size Refinement ◽  
Frictional Wear ◽  
Commercially Pure

The material examined was commercially pure titanium with intermetallic Ti-Al layers produced by magnetron sputtering followed by glow discharge assisted treatment. This material was subjected to hydrostatic extrusion at room temperature. This resulted in substantial grain size refinement in the titanium accompanied by significant property improvement. The intermetallic Ti- Al layers reduced the pressure required during hydroextrusion and also increased the microhardness and frictional wear resistance of the material.

scholarly journals Johnson–Cook Parameter Identification for Commercially Pure Titanium at Room Temperature under Quasi-Static Strain Rates

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3887
Author(s):  
Alice Siegel ◽  
Sébastien Laporte ◽  
Fabien Sauter-Starace
Keyword(s):  
Strain Rate ◽  
Room Temperature ◽  
Pure Titanium ◽  
Element Model ◽  
Tensile Tests ◽  
Strain Rates ◽  
Commercially Pure Titanium ◽  
Elastoplastic Behavior ◽  
Plastic Parts ◽  
Cook Model

Background: To simulate mechanical shocks on an intracranial implant called WIMAGINE®, Clinatec chose a Johnson–Cook model to account for the viscoplastic behavior of grade 2 titanium in a dynamic study using Radioss©. Methods: Thirty tensile specimens were subjected to tensile tests at room temperature, and the influence of the strain rate (8 × 10−3 and 8 × 10−2 s−1) and sandblasting was analyzed. Relaxations were included in the tests to analyze viscosity phenomena. Results: A whole set of parameters was identified for the elastic and plastic parts. Strain rate influence on stress was negligible at these strain rates. As expected, the sandblasting hardened the material during the tests by decreasing the hardening parameters, while local necking occurred at an earlier strain. Conclusions: This article provides the parameters of a Johnson–Cook model to simulate the elastoplastic behavior of pure titanium (T40, grade 2) in Finite Element Model (FEM) software.

Process capabilities of commercially pure titanium grade 2 formed through warm incremental sheet forming

2021 ◽  
pp. 095440542199566
Author(s):  
Pavan Kumar ◽  
Puneet Tandon
Keyword(s):  
Room Temperature ◽  
Fe Simulation ◽  
Pure Titanium ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Limit ◽  
Commercially Pure Titanium ◽  
Wall Angle ◽  
Commercially Pure ◽  
Cp Ti

Commercially pure titanium (CP-Ti) Grade-2 has many applications due to its good weldability, strength, ductility, formability, and superior corrosion resistance. Although, CP-Ti Grade-2 can be formed at room temperature, however, it has lower ductility at room temperature. Therefore, heat treatment or thermal activation is required to increase its ductility and formability. In this paper, the process capabilities of CP-Ti Grade-2 to form the components through warm incremental sheet forming (ISF) has been investigated. To identify the optimal temperature at which CP-Ti Grade-2 sheets can be incrementally formed, straight groove tests were performed experimentally at various temperatures. Two geometries, namely, varying wall angle truncated cone, and constant wall angle truncated cone were used as test cases to evaluate the formability of CP-Ti Grade-2, in terms of limiting wall angle. The formability was also assessed through forming limit diagram obtained by Finite Element (FE) simulation. With forming limit damage criterion, fracture in the formed component was predicted with FE simulation using Abaqus Explicit software. To assess the process capabilities of CP-Ti Grade-2 sheet formed through warm ISF, thickness distribution, forming forces, geometrical accuracy, and surface roughness were analyzed through both FE simulation and experimental work.

scholarly journals Oxidation kinetics of commercially pure titanium

2007 ◽  
Vol 12 (3) ◽  
pp. 525-531 ◽  
Author(s):  
E. Gemelli ◽  
N.H.A. Camargo
Keyword(s):  
Oxidation Kinetics ◽  
Room Temperature ◽  
Thermal Analyses ◽  
Pure Titanium ◽  
Thermal Characterization ◽  
Commercially Pure Titanium ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Commercially Pure

The aim of this work was to perform thermal characterization of commercially pure titanium in dry air to determine its oxidation kinetics and the structure of the oxide. The oxidation kinetics were determined thermogravimetrically under isothermal conditions in the temperature range 300 to 750 ºC for 48 hours and the structure of the oxides was determined by differential thermal analyses and X-ray diffraction in the temperature range room temperature - 1000ºC. The oxidation rate of titanium increased with increase in temperature. It was high in the initial stages of oxidation and then decreased rapidly with time, especially up to 600 ºC. The kinetic laws varied between inverse logarithmic at the lower temperatures (300 and 400 ºC) and parabolic at the higher temperatures (650, 700 and 750 ºC). Evidences from X-ray diffraction and differential thermal analyses data revealed that the passive oxide film formed at room temperature crystallized into anatase at about 276 ºC. The crystallized oxide formed in the range 276 - 457 ºC consisted of anatase, in the range 457 - 718 ºC consisted of anatase and rutile sublayers, and at temperatures beyond 718 ºC consisted of a layer of pure rutile. Scanning electron microscopy observations reveled that the oxidized surfaces were crack-free and the surface roughness increased steadily with oxidation temperature.

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