scholarly journals The Role of Moisture and Hydrogen in Hot-Salt Cracking of Titanium Alloys

2003 ◽  
Author(s):  
S P Rideout
Keyword(s):  
Titanium Alloys

scholarly journals The role of β-titanium ligaments in the deformation of dual phase titanium alloys

2019 ◽  
Vol 746 ◽  
pp. 394-405 ◽  
Author(s):  
Tea-Sung Jun ◽  
Xavier Maeder ◽  
Ayan Bhowmik ◽  
Gaylord Guillonneau ◽  
Johann Michler ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Dual Phase

Corrosion Behaviour of Ti6Al4V and TiMo10Zr4 Alloys in the Ringer’s Solution: Effect of pH and Plastic Strain

2015 ◽  
Vol 227 ◽  
pp. 435-438 ◽  
Author(s):  
Joanna Loch ◽  
Alicja Łukaszczyk ◽  
Vincent Vignal ◽  
Halina Krawiec
Keyword(s):  
Corrosion Resistance ◽  
Plastic Strain ◽  
Titanium Alloys ◽  
Passive Film ◽  
Current Density ◽  
Potentiodynamic Polarization ◽  
Corrosion Behaviour ◽  
Ringer’S Solution ◽  
Ph Values

The corrosion behaviour of titanium alloys is not well understood – especially the role of the microstructure and plastic strain. In this paper, the influence of the microstructure and plastic strain on the corrosion resistance of TiMo10Zr4 and Ti6Al4V alloys was studied in the Ringer’s solution at 37 °C. Measurements were performed for different pH values and in aerated and de-aerated solutions using potentiodynamic polarization techniques. Results obtained on the two alloys were compared. It was shown that in the absence of plastic strain TiMo10Zr4 shows better corrosion resistance than Ti6Al4V (especially for pH = 8). By contrast, the current density in the passive range measured after 8% plastic strain was greater on TiMo10Zr4 than on Ti6Al4V, indicating that the passive film on TiMo10Zr4 is less protective than that formed on Ti6Al4V.

Effect of Oxygen on Phase Precipitation and Mechanical Functionality in Ti-29Nb-13Ta-4.6Zr

2010 ◽  
Vol 436 ◽  
pp. 179-184 ◽  
Author(s):  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Toshikazu Akahori ◽  
Harumi Tsutsumi
Keyword(s):  
Solid Solution ◽  
Titanium Alloys ◽  
Young’S Modulus ◽  
Martensite Phase ◽  
Phase Precipitation ◽  
Solid Solution Strengthening ◽  
Orthorhombic Martensite ◽  
Solution Strengthening ◽  
Effect Of Oxygen

Oxygen plays very important roles in titanium and its alloys. Solute oxygen in titanium alloys leads to solid solution strengthening, suppressing the precipitation of the athermal omegaor orthorhombic martensite phase, enhancing the formation of the -case, etc. The proper using oxygen is effective to improve the mechanical functionalities of titanium alloys. However, the role of oxygen in titanium alloys is still not well understood. Therefore, the effect of oxygen on the mechanical functionalities such as strength-ductility balance, hardness, and Young’s modulus in Ti-29nb-13Ta-4.6Zr was investigated.

Dwell Sensitive Fatigue Response of Titanium Alloys for Power Plant Applications

2002 ◽  
Vol 125 (1) ◽  
pp. 241-245 ◽  
Author(s):  
M. R. Bache ◽  
W. J. Evans
Keyword(s):  
Titanium Alloys ◽  
Fatigue Testing ◽  
Cyclic Strain ◽  
Peak Stress ◽  
Strain Accumulation ◽  
Cleavage Facet ◽  
Fundamental Cause ◽  
Temperature Strain ◽  
Facet Formation

The phenomenon of “dwell sensitivity” in the α+β and near α titanium alloys and the intrinsic relationship with quasi-cleavage facet formation is discussed. In the present paper, particular emphasis is placed upon the role of “cold creep” and ambient temperature strain accumulation under cyclic loading. A process of stress redistribution between microstructurally distinct regions that demonstrate different strengths is proposed as the fundamental cause of facet development and subsequent dwell failures. A model to describe the redistribution process is validated through a matrix of fatigue testing designed to assess the effects of microstructural form, stress axiality, and periods of dwell loading at peak stress on cyclic strain accumulation.

scholarly journals Deformation and fracture behavior of new strain-transformable titanium alloys: a multi-scale investigation

2020 ◽  
Vol 321 ◽  
pp. 11006
Author(s):  
Chloé VARENNE ◽  
Frédéric PRIMA ◽  
Cédrik BROZEK ◽  
Julie BOURGON ◽  
Jacques BESSON ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Coarse Grained ◽  
Multi Scale ◽  
Ti Alloys ◽  
Deformation And Fracture ◽  
Initiation And Propagation ◽  
Deformation Features ◽  
Deformation Work ◽  
Ductile Fracture Process

Titanium alloys possessing Twinning and Transformation Induced Plasticity effects show promising mechanical properties, particularly high ductility, hardenability, impact and fracture toughness. This work focuses on a strain-transformable, coarse-grained β-Ti-Cr-Sn alloy displaying TWIP effect. To account for the enhanced properties of this alloy, compared to more conventional β-Ti alloys, fracture and deformation features were correlated at different scales. Examinations evidenced a major role of twinning and, more generally, of plasticity-induced phenomena in the ductile fracture process. The resistance of this alloy to plastic deformation (work-hardening), and to crack initiation and propagation is interpreted in view of the progressive, multiscale twinning mechanisms that occur up to the very final stages of fracture.

scholarly journals The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

2020 ◽  
Vol 7 ◽  
Author(s):  
Yolaine Danard ◽  
Fan Sun ◽  
Thierry Gloriant ◽  
Immanuel Freiherr Von Thüngen ◽  
Michaël Piellard ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Solution Strengthening
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