Jul 5 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Welding
Annealing
Applications
Introduction
Titanium alloys have many good attributes that allow their use in varied industries such as consumer electronics, aerospace, medical, marine, military, automobile, and sports equipment. Their key properties are excellent corrosion resistance, very high tensile strength, and durability.
Grade 17 Ti-0.05Pd alloy is quite similar to Grade 11. The main difference is the varying palladium content. The presence of palladium helps to enhance the alloy’s corrosion resistance.
The following sections will discuss in detail about grade 17 Ti-0.05Pd alloy.
Chemical Composition
The chemical composition of grade 17 Ti-0.05Pd alloy is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
0.2 |
|
Oxygen, O |
0.18 |
|
Carbon, C |
0.08 |
|
Palladium, Pd |
0.04-0.08 |
|
Nitrogen, N |
0.03 |
|
Hydrogen, H |
0.015 |
|
Other, total |
0.4 |
|
Titanium, Ti |
Balance |
Physical Properties
The physical properties of grade 17 Ti-0.05Pd alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
4.51 g/cm3 |
0.162 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of grade 17 Ti-0.05Pd alloy.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
345 MPa |
50038 psi |
|
Yield strength |
220 MPa |
31908 psi |
|
Poisson's ratio |
0.34-0.40 |
0.34-0.40 |
|
Elastic modulus |
103 GPa |
14938 ksi |
|
Elongation in 50 mm (A5) |
25% |
25% |
|
Hardness (HV) |
115 |
115 |
Thermal Properties
The thermal properties of grade 17 Ti-0.05Pd alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal conductivity (room temperature) |
20.8 W/mK |
144 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Welding
Weldability of grade 6 Ti-5Al-2.5Sn alloy is rated as good. This alloy is a single-phase material, hence the microstructure of the alpha phase is not affected by thermal treatments or welding temperatures.
Annealing
Annealing of this material can be performed by heating to 650-760°C (1202-1400°F) for 6 min -2 h and then air cooled. In case stress relieving is required, the material has to be heated to 480-595°C (896-1103°F) for 15 min - 4 h, and then air cooled.
Applications
Grade 17 Ti-0.05Pd alloy is chiefly used in the chemical and marine industries due to its good corrosion resistance and in airframe construction due to its ease in formability.