Oxidation Effects during High Temperature Deformation of CP Ti Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 3678-3683
Author(s):  
Ming Jen Tan ◽  
X.J. Zhu ◽  
S. Thiruvarudchelvan ◽  
K.M. Liew
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
High Temperatures ◽  
Pure Titanium ◽  
Initial Strain Rate ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Uniaxial Tensile ◽  
Commercially Pure Titanium ◽  
Commercially Pure

This work reports the influence of oxidation on the superplasticity of commercially pure titanium at high temperatures. Uniaxial tensile tests were conducted at temperatures in the range 600-800°C with an initial strain rate of 10s-1 to 10s-3. This study shows that oxidization at the surface of the alloy causes oxide film on the surface of commercially pure titanium alloy, and the thickness of oxide film increase with increasing exposure time and temperature. XRD analysis shows that the oxide film consists of TiO2. Because this oxide film is very brittle, it can induce clefts and degrade the ductility of the titanium at high temperatures. The mechanism of the initial clefts was investigated and a model for the cleft initiation and propagation during high temperature tensile test was proposed.

Superplasticity in CP-Titanium Alloys

2007 ◽  
Vol 551-552 ◽  
pp. 373-378 ◽  
Author(s):  
X.J. Zhu ◽  
Ming Jen Tan ◽  
K.M. Liew
Keyword(s):  
High Temperature ◽  
Grain Growth ◽  
Initial Strain Rate ◽  
Tensile Tests ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Uniaxial Tensile ◽  
Step Method ◽  
Commercially Pure ◽  
Effects Of Temperature

In this work, studies were carried out to investigate the superplasticity of a commercially pure (CP) titanium alloy during high temperature deformation. Uniaxial tensile tests were carried out at 600, 750 and 800°C with an initial strain rate from 10-1s-1 to 10-4s-1. It was found that the alloy do not show good superplasticity due fast grain growth at high temperature and cavity. The effects of temperature on the grain growth and cavity phenomena as well as the dynamic recrystallization of the alloy were studied and a ‘two-step-method’ was introduced to increase the superplasticity of the alloy.

MST 3Al-2.5V

Alloy Digest ◽  
1959 ◽  
Vol 8 (4) ◽  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Elevated Temperature ◽  
Pure Titanium ◽  
Heat Treating ◽  
Commercially Pure Titanium ◽  
Bend Strength ◽  
Elevated Temperature Strength ◽  
Temperature Performance ◽  
Commercially Pure

Abstract MST 3A1-2.5V is a highly weldable titanium alloy having greater room and elevated temperature strength with greater flarability than commercially pure titanium. It is also age-hardenable. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as creep and fatigue. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ti-18. Producer or source: Mallory-Sharon Metals Company.

scholarly journals Corrosion Resistance of Ti-29Nb-13Ta-4.6Zr Alloy in a Fluoride-Containing Solution

2012 ◽  
Vol 529-530 ◽  
pp. 584-587
Author(s):  
Shinji Takemoto ◽  
Masaaki Nakai ◽  
Masayuki Hattori ◽  
Masao Yoshinari ◽  
Eiji Kawada ◽  
...  
Keyword(s):  
Oxide Film ◽  
Saline Solution ◽  
Pure Titanium ◽  
Marked Change ◽  
Commercially Pure Titanium ◽  
Subsequent Increase ◽  
Commercially Pure ◽  
Outermost Surface ◽  
Before And After ◽  
Constituent Elements

The objective of this study was to evaluate the corrosion behavior of Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) with immersion in an acidic saline solution containing fluoride by investigating change in color and the surface structure of the oxide film. With immersion in fluoride-containing solution, TNTZ showed a less marked change in color than commercially pure titanium (TI), and a smaller decrease in glossiness. The outermost surface was covered with oxides from its constituent elements at before and after immersion in solution with or without fluoride. When immersed in fluoride-containing solution, the film consisted of larger niobium and tantalum oxides than that before or after immersion in solution without fluoride. In summary, TNTZ showed superior resistance to discoloration to TI after immersion in fluoride-containing solution. The results suggest that the subsequent increase in niobium and tantalum fractions in the oxide film in TNTZ improves resistance to corrosion.

Instrumented Indentation Testing to Evaluate High-Temperature Material Properties

2011 ◽  
Author(s):  
Chan-Pyoung Park ◽  
Kug-Hwan Kim ◽  
Seung-Kyun Kang ◽  
Won-Je Jo ◽  
Dongil Kwon
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Material Properties ◽  
Indentation Test ◽  
Temperature Deformation ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Indentation Testing ◽  
Instrumented Indentation ◽  
Uniaxial Tensile Testing

Mechanical properties must be evaluated at high temperatures to predict high-temperature deformation and fracture behavior, since high-temperature properties differ greatly from those at room temperature. A high-temperature uniaxial tensile test, a representative high-temperature test, is generally used, but it has the limitation of obtaining merely the average material properties. Recently an advanced method for evaluating tensile properties has been developed: the instrumented indentation test (IIT), which simultaneously applies a load and measures displacement. Here we use instrumented indentation testing to evaluate the flow properties (yield strength, ultimate tensile strength, etc.) of heat-resistant steel at high temperature. The contact-area determination algorithm and representative stress-representative strain approach are applied for high temperatures. We compare our experimental results to those of conventional high-temperature uniaxial tensile testing to assess the high-temperature performance of the instumented indentation test.

CRUCIBLE A-70

Alloy Digest ◽  
1971 ◽  
Vol 20 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Pure Titanium ◽  
Heat Treating ◽  
Commercially Pure Titanium ◽  
Bearing Strength ◽  
Temperature Performance ◽  
Commercially Pure ◽  
Specialty Metals

Abstract CRUCIBLE A-70 is a grade of commercially pure titanium that is used where higher strength is required than is achieved with grade A-55. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive, shear, and bearing strength as well as fracture toughness, creep, and fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-63. Producer or source: Crucible Specialty Metals Division, Colt Industries.

Superplasticity-Like Behavior, Microstructures and Deformation Mechanism Map in Superlight Mg-6Li-3Zn Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 2504-2510
Author(s):  
Fu Rong Cao ◽  
Ren Guo Guan ◽  
Hua Ding ◽  
Ying Long Li ◽  
Ge Zhou ◽  
...  
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
Strain Rate ◽  
Deformation Mechanism ◽  
Initial Strain Rate ◽  
Lattice Diffusion ◽  
Initial Strain ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Diffusion Activation Energy

Mg-6Li-3Zn alloy sheets were prepared by melting and casting, and heavy rolling with a total reduction of 94%. The high-temperature mechanical behavior, microstructures and deformation mechanisms were investigated. The maximum elongation to failure of 300% was demonstrated at 623K and an initial strain rate of 1.67×10-3s-1. Observations by optical microscope, transmission electron microscope reveal that significant dynamic recrystallization and grain refinement occurred in banded grains at 573K and an initial strain rate of 1.67×10-3s-1, under which the subgrain contour was ambiguous and dislocation distribution was relatively uniform. It is shown by newly constructed deformation mechanism map that the high-temperature deformation mechanism in Mg-6Li-3Zn alloy sheet with banded grains at 573K and an initial strain rate of 1.67×10-3 s-1 is dislocation viscous glide controlled by lattice diffusion, the stress exponent is 3 (strain rate sensitivity exponent 0.33) and deformation activation energy is 134.8 kJ mol-1, which is the same as the lattice diffusion activation energy of magnesium.

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