Aug 6 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
Grade Ti-4Al-4Mo-2Sn-0.5Si alloy is an alpha-beta alloy with medium strength. This alloy can be solution treated at 900ºC (1652°F) and aged 500ºC (932°F).
The following sections will discuss in detail about grade Ti-4Al-4Mo-2Sn-0.5Si alloy.
Chemical Composition
The chemical composition of grade Ti-4Al-4Mo-2Sn-0.5Si alloy is outlined in the following table.
Element |
Content (%) |
Titanium, Ti |
89 |
Molybdenum, Mo |
4 |
Aluminum, Al |
4 |
Tin, Sn |
2 |
Iron, Fe |
≤ 0.20 |
Oxygen, O |
≤ 0.27 |
Silicon, Si |
0.5 |
Hydrogen, H |
≤ 0.0125 |
Physical Properties
The physical properties of grade Ti-4Al-4Mo-2Sn-0.5Si alloy are tabulated below.
Properties |
Metric |
Imperial |
Density |
4.57 g/cm3 |
0.165 lb/in3 |
Melting point |
≤ 1650 °C |
≤ 3000 °F |
Mechanical Properties
The following table shows mechanical properties of grade Ti-4Al-4Mo-2Sn-0.5Si alloy.
Properties |
Metric |
Imperial |
Tensile strength |
1100 MPa |
160000 psi |
Yield strength |
940 MPa |
136000 psi |
Poisson’s ratio |
0.33 |
0.33 |
Elastic modulus |
115 GPa |
16700 ksi |
Elongation at break |
7 |
7 |
Hardness, Vickers |
360 |
360 |
Thermal Properties
The thermal properties of grade Ti-4Al-4Mo-2Sn-0.5Si alloy are tabulated below.
Properties |
Metric |
Imperial |
Thermal expansion co-efficient (@20-100°C/68-212°F) |
8 µm/m°C |
4.89 µin/in°F |
Thermal conductivity |
7.50 W/mK |
52 BTU in/hr.ft².°F |
Applications
Grade Ti-4Al-4Mo-2Sn-0.5Si alloy is used in the following application areas:
-
In aerospace – for airframe and engine components