Grade 11 Ti-0.15Pd Alloy (UNS R52250)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Forming
     Welding
     Annealing
     Forging
Applications

Introduction

Grade 11 Ti-0.15Pd alloy’s mechanical properties are known to be similar to commercially pure titanium grade 1. The main difference is the presence of palladium in grade 11. Palladium helps to enhance the alloy’s corrosion resistance in crevices and reducing acid chloride environments. This alloy has excellent ductility, high-impact toughness and useful strength.

The following sections will discuss in detail about grade 11 Ti-0.15Pd alloy.

Chemical Composition

The chemical composition of grade 11 Ti-0.15Pd alloy is outlined in the following table.

Element Content (%)
Iron, Fe <0.20
Oxygen, O <0.18
Palladium, Pd 0.12-0.25
Carbon, C <0.10
Nitrogen, N <0.03
Hydrogen, H <0.015
Titanium, Ti Balance

Physical Properties

The physical properties of grade 11 Ti-0.15Pd alloy are tabulated below.

Properties Metric Imperial
Density 4.51 g/cm3 0.162 lb/in3
Melting point 1670°C 3038°F

Mechanical Properties

The following table shows mechanical properties of grade 11 Ti-0.15Pd alloy.

Properties Metric Imperial
Tensile strength 345 MPa 50038 psi
Yield strength 221 MPa 32908 psi
Elastic modulus 103 GPa 14938 ksi
Elongation over 2”% 37% 37%
Hardness (BHN) 120 120

Thermal Properties

The thermal properties of grade 11 Ti-0.15Pd alloy are tabulated below.

Properties Metric Imperial
Thermal conductivity (room temperature) 20.6 W/mK 143 BTU in/hr.ft².°F

Other Designations

Equivalent materials to grade 11 Ti-0.15Pd alloy are as follows:

  • ASTM B265
  • ASTM B337
  • ASTM B338
  • ASTM B348
  • ASTM B861
  • ASTM B862
  • ASTM B381
  • ASTM B863
  • ASTM B363 (WPT)

Fabrication and Heat Treatment

Forming

Grade 11 Ti-0.15Pd alloy has good formability.

Welding

Weldability of grade 11 Ti-0.15Pd alloy is rated as excellent.

Annealing

Annealing of this material can be performed by heating to 704°C (1300°F) for 2 h and then air cooled. In case stress relieving is required, the material has to be heated to 482-538°C (900-1000°F) for 45 min.

Forging

Rough forging can be performed at 871°C (1600°F) and completed at 788-843°C (1450-1550°F).

Applications

Grade 11 Ti-0.15Pd alloy is chiefly used in the chemical and marine industries and in airframe construction sectors.

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