Grade Ti-4Al-4Mo-2Sn-0.5Si Alloy

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

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