Structural Titanium Biomedical Alloys

For Aerospace Applications

D.J. Bryan, E.D. Keys, J.V. Mantione, H.L. Freese

Titanium 2010

October 3-6, 2010 – Orlando, FL

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ATIAerospace

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Overview

• Introduction

• Structural Applications

• Annealed Properties

• Aged Properties

• Summary

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Introduction

Biomedical Titanium Alloys

ATI 6-7TM

TiOsteum®

Stryker TMZF®

ATI 15MoTM

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Introduction

• Traditional Biomedical Ti Alloys

– Aerospace alloys adapted for Biomedical applications

– Alpha-beta alloys (high strength, good ductility)

• ATI 6-4TM, ATI 6-4ELITM, ATI CP-2TM, ATI 3-2.5TM

– Aerospace beta alloys (high strength, good high cycle fatigue)

• ATI 38-644TM, ATI 10-2-3TM

• Targeted Biomedical Structural Ti Alloys

– Developed for biocompatibility and osseointegratability

• Low toxicity, elastic modulus, and bone ―in-growth‖

• Increased corrosion & wear resistance

• ATI 6-7TM, TiOsteum®, Stryker TMZF®, ATI 15MoTM

TiOsteum is a registered trademark of ATI Properties, Inc.

TMZF is a registered trademark of Stryker Orthopaedics

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– Ti 6Al-7Nb Alloy developed as a Ti 6Al-4V replacement with better biocompatibility

– Ti 12Mo – 6Zr – 2Fe Alloy

– Low modulus of elasticity, high strength

– Improved fatigue, ductility

– Low modulus of elasticity

– Ti 35Nb – 7Zr – 5Ta Alloy

– Superior corrosion resistance

– Lowest modulus of elasticity

Structural Biomedical Titanium Alloys

ATI 6-7TM

TiOsteum®

Stryker TMZF®

ATI 15MoTM

Po

lari

zati

on

Resis

tan

ce (

R/Ω

-cm

)

Steinemann, et.al., ―Beta Titanium Alloy for Surgical Implants,‖

7th World Conference on Titanium, 1992.

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0

200

400

600

800

1000

1200

6 8 10 12 14 16 18 20

Elastic Modulus (Msi)

Sp

ecif

ic Y

S i

n A

nn

eale

d C

on

dit

ion

(lb

f*in

/lb

) ATI 38-644TM

Ti-6246

Ti-6242

Ti-64TMZF®

ATI 15MoTMTiOsteum® CP4

Ti-6-7

Elastic Modulus and Specific Strength

> 0.1800.170-0.180

< 0.170

Density (lb/in3)

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Structural Applications

Biomedical Titanium Alloys

ATI 6-7TM

TiOsteum®

Stryker TMZF®

ATI 15MoTM

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Medical and Surgical Structural Devices

• Titanium Mill Products

– Long products: billet, bar, rod, wire

– Flat products: sheet, strip, plate

– Machining stock (heat treated)

– Forging stock

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• Titanium Product Applications

– Fracture fixation

– Orthopedic implants

– Spinal implants

– Screws, fasteners

Medical and Surgical Structural Devices

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Annealed Properties

Biomedical Titanium Alloys

ATI 6-7TM

TiOsteum®

Stryker TMZF®

ATI 15MoTM

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Tensile Yield Strength & Elongation

(Annealed Condition)

60

70

80

90

100

110

120

130

140

150

160

0 10 20 30 40 50 60

Elongation (%)

Yie

ld S

tren

gth

(ksi)

TiOsteum®

ATI 15MoTM

CP4

TMZF®

ATI 6-4

ATI 6-7

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0

100

200

300

400

500

600

700

Stryker TMZF®

ATI 6-4 ATI CP4 ATI 6-7 ATI 15Mo (aged)

ATI 15Mo (a+b process)

Smooth

Notched (kT=1.6)

TM TM TM TM TM

Disegi, J., ―AO/ASIF Titanium 6%Al – 7%Nb Implant Material,‖ AO/ASIF Technical Publication, Synthes, 1993.

B. Marquardt, R, Shetty, ―Beta Titanium Alloys Processed for High Strength Orthopedic Applications,‖ Journal of ASTM Int., Oct-05, Vol. 2 No.9

―TMZF – A Beta titanium Alloy for Orthopaedic Implants,‖ Stryker, 2003.

Rotating Beam Fatigue Strength

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Aged Properties

Biomedical Titanium Alloys

TiOsteum®

Stryker TMZF®

ATI 15MoTM

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0

5

10

15

20

0 1 2 3 4 5 6 7 8 9 10

Al Equivalent

Mo

Eq

uiv

ale

nt

ATI

38-644TM

Ti-

10-2-3

Ti-17

Ti-6246

Ti-6242Ti-64

ATI 425®

Ti-5553

TMZF®

ATI 15MoTM

TiOsteum®

> 180

170-180

160-170

<160

UTS (ksi)

Ultimate Tensile Strength & Alloy Content

(High Strength Condition)

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850

900

950

1000

1050

1100

1150

1200

1250

0 2 4 6 8 10 12 14

Elongation (%)

Sp

ecif

ic Y

S i

n H

igh

Str

en

gth

Co

nd

itio

n

(lb

f*in

/lb

) ATI

38-644TM

Ti-64

ATI

15MoTM

Ti-17TMZF®

Ti-

10-2-3

TiOsteum®

Ti-5553

> 0.1800.170-0.180< 0.170

Density (lb/in3)

Specific Yield Strength & Elongation

(High Strength Condition)

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Summary

Biomedical Titanium Alloys

ATI 6-7TM

TiOsteum®

Stryker TMZF®

ATI-15MoTM

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Aerospace Structural Components

Biomedical Titanium Alloy Opportunities

• Fuselage frames & spars

• Wing & body fairings

• Window & door frames

• Nacelle & inlet skins

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ATI 6-7TM TiOsteum® Stryker TMZF® ATI-15MoTM

Summary• Structural Biomedical Titanium Alloys, originally developed for

biocompatibility (low toxicity, elastic modulus & bone ―in-

growth‖) can offer unique advantages for Aerospace structural

applications.

– Low modulus

– High ductility / formability

– Heat treatable to high strength

– Good corrosion & wear resistance

– Improved high cycle notch fatigue

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Thank You

Questions?

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Titanium 2010: October 3-6, 2010 — Orlando, FL