Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr Alloy (UNS R58650)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Heat Treatment
     Aging
Applications

Introduction

Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is an alpha-beta wrought alloy that has high tensile strength, good fracture toughness, and good crack growth/fatigue resistance.

The following sections will discuss in detail about grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy.

Chemical Composition

The chemical composition of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is outlined in the following table.

Element Content (%)
Titanium, Ti 83
Aluminum, Al 5
Molybdenum, Mo 4
Chromium, Cr 4
Tin, Sn 2
Zirconium, Zr 2
Iron, Fe ≤ 0.30
Oxygen, O 0.080 - 0.13
Nitrogen, N ≤ 0.040
Hydrogen, H ≤ 0.0125

Physical Properties

The physical properties of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy are tabulated below.

Properties Metric Imperial
Density 4.65 g/cm3 0.168 lb/in3

Mechanical Properties

The following table shows mechanical properties of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy.

Properties Metric Imperial
Tensile strength 1000 MPa 145000 psi
Yield strength 1140 MPa 165000 psi
Poisson's ratio 0.33 0.33
Elastic modulus 100-120 GPa 14503-17404 ksi
Shear modulus 43.2 GPa 6270 ksi
Elongation at break 8% 8%
Hardness, Brinell 369 369
Hardness, Knoop 403 403
Hardness, Rockwell C 40 40
Hardness, Vickers 386 386

Thermal Properties

The thermal properties of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 8.50 µm/m°C 4.72 µin/in°F
Thermal conductivity 7.80 W/mK 54.1 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Heat Treatment

Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is double solution treated 860ºC (1580°F) for 2h and 800ºC (1472°F) for 4h.

Aging

Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy can be aged at 620ºC (1148°F)for 8h.

Applications

Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is used in the following application areas:

  • Compressor discs
  • Heavy section forgings for gas turbine engine components.

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