Grade Ti 6Al 2Nb 1Ta 0.8Mo Alloy

Aug 9 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications

Introduction

Titanium alloys are divided into four categories - alpha-phase, near-alpha phase, beta-phase, and alpha-beta-phase.

Grade Ti 6Al 2Nb 1Ta 0.8Mo alloy is an alpha alloy. This alloy is known to possess excellent weldability, high toughness, and resistance to corrosion in salt water. If oxygen impurity increases, beta transus is increased and grain size is decreased.

The following sections will discuss in detail about grade Ti 6Al 2Nb 1Ta 0.8Mo alloy.

Chemical Composition

The chemical composition of grade Ti 6Al 2Nb 1Ta 0.8Mo alloy is outlined in the following table.

Element Content (%)
Titanium, Ti 90
Aluminum, Al 6
Niobium, Nb 2
Tantalum, Ta 1
Molybdenum, Mo 0.80
Iron, Fe ≤ 0.12
Oxygen, O ≤ 0.10
Hydrogen, H ≤ 0.10
Carbon, C ≤ 0.030
Nitrogen, N ≤ 0.020
Other, each ≤ 0.10
Other, total ≤ 0.40

Physical Properties

The physical properties of grade Ti 6Al 2Nb 1Ta 0.8Mo alloy are tabulated below.

Properties Metric Imperial
Density 4.48 g/cm3 0.162 lb/in3
Melting point ≤ 1650 °C ≤ 3000 °F

Mechanical Properties

The following table shows mechanical properties of grade Ti 6Al 2Nb 1Ta 0.8Mo alloy.

Properties Metric Imperial
Tensile strength 830 MPa 120000 psi
Yield strength 710 MPa 103000 psi
Poisson’s ratio 0.31 0.31
Elastic modulus 115 GPa 16700 ksi
Shear modulus 43.9 GPa 6370 ksi
Elongation at break 11% 11%
Hardness, Brinell 290 290
Hardness, Knoop 315 315
Hardness, Rockwell C 30 30
Hardness, Vickers 304 304

Thermal Properties

The thermal properties of grade Ti 6Al 2Nb 1Ta 0.8Mo alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 9 µm/m°C 5 µin/in°F
Thermal conductivity 6.40 W/mK 44.4 BTU in/hr.ft².°F

Applications

Grade 6Al 2Nb 1Ta 0.8Mo alloy is used in the following application areas:

  • Submersible hulls
  • Pressure vessels

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