scholarly journals Contact Guidance Effect and Prevention of Microfouling on a Beta Titanium Alloy Surface Structured by Electron-Beam Technology

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1474
Author(s):  
Sara Ferraris ◽  
Fernando Warkomicka ◽  
Jacopo Barberi ◽  
Andrea Cochis ◽  
Alessandro Calogero Scalia ◽  
...  
Keyword(s):  
Human Fibroblasts ◽  
Surface Texturing ◽  
Stress Shielding ◽  
Young Modulus ◽  
Contact Guidance ◽  
Shielding Effect ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beam Surface ◽  
Micro Structuring

Nano- and micro-structuring of implantable materials constitute a promising approach to introduce mechanical contact guidance effect, drive cells colonization, as well as to prevent bacteria adhesion and biofilm aggregation, through antifouling topography. Accordingly, this paper aims to extend the application of e-beam surface texturing and nano-structuring to the beta titanium alloys, which are of great interest for biomedical implants because of the low Young modulus and the reduction of the stress shielding effect. The paper shows that surface texturing on the micro-scale (micro-grooves) is functional to a contact guidance effect on gingival fibroblasts. Moreover, nano-structuring, derived from the e-beam surface treatment, is effective to prevent microfouling. In fact, human fibroblasts were cultivated directly onto grooved specimens showing to sense the surface micro-structure thus spreading following the grooves’ orientation. Moreover, Staphylococcus aureus colonies adhesion was prevented by the nano-topographies in comparison to the mirror-polished control, thus demonstrating promising antifouling properties. Furthermore, the research goes into detail to understand the mechanism of microfouling prevention due to nano-topography and microstructure.

A METALLURGICAL OVERVIEW OF TI – BASED ALLOY IN BIOMEDICAL APPLICATIONS

2015 ◽  
Vol 76 (7) ◽  
Author(s):  
Nur Hidayatul Nadhirah Elmi Azham Shah ◽  
Mazyan Yahaya ◽  
Maheran Sulaiman ◽  
Muhammad Hussain Ismail
Keyword(s):  
Young’S Modulus ◽  
Biomedical Application ◽  
Young's Modulus ◽  
Stress Shielding ◽  
Young Modulus ◽  
Processing Technique ◽  
Shielding Effect ◽  
Β Phase ◽  
Ti Alloys ◽  
Α Phase

Titanium (Ti)-based alloys are prominently used in biomedical application. This review paper emphasizes on some of the important aspects of the Ti-alloys in terms of metallurgical aspects, manufacturing routes and biocompatibility. Two kinds of structure are reviewed namely dense and porous, both differs in terms of purpose and satisfies different needs. This advancement of materials and equipment helps to improve the quality of life for patients and alleviate their health problems. Metallic materials, mainly Ti-based alloys have been used commercially as bone implant owing to its promising mechanical properties, biocompatibility and bioactivity. The outmost important issue in manufacturing  of  this  alloy  is  the  impurity  contents,  specifically  oxygen  and  carbon  which contribute   to decreasing in material performance of the alloy attributed from the formation of unwanted  oxide compounds such as TiO2 and  TiC. Another issue is the mismatch value of the Young’s modulus between the metallic implant and bone that result in stress shielding effect.  The structure of Ti-based  alloy is  mainly comprised of α-phase, β-phase or a combination of  both that result in variation of Young’s modulus ranging from 45 -110 GPa. Compared to α-phase Ti alloy, the β-phase rich alloys may exhibit lower value of Young modulus through the right processing technique. Therefore, the development of β-phase Ti-alloys has been researched progressively in line with the need of low Young’s modulus that suit for implant applications.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Radiation-Induced Precipitation in Ti-6A1-4V

1980 ◽  
Vol 38 ◽  
pp. 154-155
Author(s):  
J. E. O'Neal ◽  
S. M. L. Sastry ◽  
J. W. Davis
Keyword(s):  
Dark Field ◽  
Dislocation Loops ◽  
Beta Titanium Alloy ◽  
Defect Clusters ◽  
Weak Beam ◽  
Beta Titanium ◽  
Small Defect ◽  
Radiation Induced ◽  
Vector Orientation ◽  
Defect Microstructures

The radiation-induced defect structure and nonequilibrium phase precipitation were studied in T1-6A1-4V (an alpha-beta titanium alloy), irradiated at 450 ± 30°C in row VII of the EBR-II to a fluence of 3.0 × 1021 neutrons/cm2 (En > 0.1 MeV). The Irradiation-induced defect microstructures were examined using bright-field, conventional dark-field, and weak-beam dark-field techniques. The nature of dislocations and dislocation loops was determined by standard-contrast experiments under two-beam conditions, and the small defect clusters were identified using the line-of-contrast criterion and black-white vector orientation criterion.

SP 700

Alloy Digest ◽  
1995 ◽  
Vol 44 (6) ◽  
Keyword(s):  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Beta Titanium Alloy ◽  
Superplastic Behavior ◽  
Temperature Performance ◽  
Beta Titanium ◽  
Wide Range ◽  
Alpha Beta ◽  
Cold Workability

Abstract SP 700 is a high strength, beta-rich alpha-beta titanium alloy. It was developed with the following attributes: (1) excellent hot- and cold-workability; (2) enhanced hardenability with a wide range of mechanical properties that can be obtained by heat treatment; and (3) superior superplastic behavior at low temperature (around 1050 K). This datasheet provides information on composition, physical properties, microstructure, elasticity, tensile properties, and bend strength. It also includes information on high temperature performance as well as heat treating. Filing Code: TI-107. Producer or source: NKK Corporation.

ALLVAC 6Al-6V-2Sn

Alloy Digest ◽  
1991 ◽  
Vol 40 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Stabilizing Effect ◽  
Alpha Beta

Abstract ALLVAC 6A1-6V-2Sn is a highly beta stabilized alpha + beta titanium alloy, a modification of the 6 A1-4V system. Added vanadium plus copper and iron produce the stabilizing effect. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ti-98. Producer or source: Teledyne Allvac.

UNS R54620

Alloy Digest ◽  
1987 ◽  
Vol 36 (7) ◽  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Time Use ◽  
Temperature Stability ◽  
High Strength ◽  
Heat Treating ◽  
High Temperature Stability ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Long Time

Abstract UNS No. R54620 is an alpha-beta titanium alloy. It has an excellent combination of tensile strength, creep strength, toughness and high-temperature stability that makes it suitable for service to 1050 F. It is recommended for use where high strength is required. It has outstanding advantages for long-time use at temperatures to 800 F. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-86. Producer or source: Titanium alloy mills.

RMI 6Al-6V-2Sn

Alloy Digest ◽  
1980 ◽  
Vol 29 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Rocket Engine ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Beta Titanium Alloy ◽  
Annealed Condition ◽  
Good Corrosion Resistance ◽  
Beta Titanium ◽  
Alpha Beta

Abstract RMI 6A1-6V-2Sn is an alpha-beta titanium alloy that provides a tensile strength of 150,000 psi in the mill-annealed condition in section sizes up to 2 inches. It offers good corrosion resistance in applications requiring high strength-to-weight ratios at temperatures up to 750 F. Among its uses are rocket engine cases and ordnance components. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-79. Producer or source: RMI Company.

Coarsening Behavior of an Alpha-Beta Titanium Alloy

2004 ◽  
Author(s):  
S. L. Semiatin ◽  
B. C. Kirby ◽  
G. A. Salishchev
Keyword(s):  
Titanium Alloy ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Coarsening Behavior ◽  
Alpha Beta
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