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Types of Titanium Alloys

Titanium alloys are advanced metallic materials prized for their exceptional strength-to-weight ratio, corrosion resistance, and biocompatibility. These alloys are categorized into alpha, alpha-beta, and beta types, each optimized for specific performance needs. 

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Titanium Alloys

Types of Titanium Alloys

Category

Alloy Type

Composition

Key Properties

Common Applications

Standards/Grades
Alpha Alloys CP Titanium (Grade 1-4) 99.5%+ Ti Excellent corrosion resistance, good formability, low strength Chemical processing, marine components ASTM B265 (Gr 1-4)
Ti-5Al-2.5Sn Ti + 5% Al + 2.5% Sn High creep resistance, weldability Aerospace (engine components), cryogenic uses AMS 4910
Near-Alpha Alloys Ti-6Al-2Sn-4Zr-2Mo Ti + 6% Al + 2% Sn + 4% Zr + 2% Mo High-temperature stability (up to 500掳C), fatigue resistance Jet engines, airframe structures AMS 4919
Ti-8Al-1Mo-1V Ti + 8% Al + 1% Mo + 1% V Lightweight, moderate strength Compressor blades, aerospace AMS 4912
Alpha-Beta Alloys Ti-6Al-4V (Grade 5) Ti + 6% Al + 4% V Balanced strength/ductility, biocompatible Aerospace, medical implants, marine hardware ASTM F1472, AMS 4928
Ti-6Al-4V ELI Low interstitial version of Ti-6Al-4V Enhanced fracture toughness (for medical/surgical uses) Spinal implants, surgical tools ASTM F136
Ti-6Al-2Sn-4Zr-6Mo Ti + 6% Al + 2% Sn + 4% Zr + 6% Mo High strength, corrosion resistance Military aircraft, marine shafts AMS 4981
Beta Alloys Ti-10V-2Fe-3Al Ti + 10% V + 2% Fe + 3% Al Ultra-high strength, forgeability Landing gear, structural aerospace parts AMS 4987
Ti-15V-3Cr-3Sn-3Al Ti + 15% V + 3% Cr + 3% Sn + 3% Al Cold-formable, excellent fatigue life Springs, fasteners, airframes AMS 4914
Ti-3Al-8V-6Cr-4Zr-4Mo Ti + 3% Al + 8% V + 6% Cr + 4% Zr + 4% Mo Superior corrosion resistance (acidic/offshore) Oilfield equipment, chemical plants ASTM B381
Specialty Alloys Ti-0.2Pd (Grade 7) Ti + 0.2% Pd Enhanced crevice corrosion resistance Chemical reactors, desalination plants ASTM B265 (Gr 7)
Ti-0.3Mo-0.8Ni (Grade 12) Ti + 0.3% Mo + 0.8% Ni Improved weldability vs. CP Ti Heat exchangers, hydrometallurgy ASTM B265 (Gr 12)
Ti-6Al-7Nb Ti + 6% Al + 7% Nb Medical-grade alternative to Ti-6Al-4V (no vanadium) Orthopedic implants, dental prosthetics ASTM F1295

Key Notes:

  • Alpha Alloys: Non-heat-treatable, best for corrosion resistance.

  • Alpha-Beta Alloys: Most widely used (e.g., Ti-6Al-4V).

  • Beta Alloys: Heat-treatable for extreme strength.

  • Standards: Aerospace (AMS), medical (ASTM F), industrial (ASTM B).

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