Ti-15Mo Titanium Alloy (UNS R58210 , ASTM F2066)

Titanium 15Mo Alloys (UNS R58150) is a beta titanium alloy capable of a wide variety of properties depending on the metallurgical condition. The achievable properties include low modulus of elasticity, high strength, excellent fatigue strength, good ductility/formability, exceptional corrosion resistance, and well-documented biocompatibility.

Ti-15Mo Titanium Alloys are manufactured as bar, rod, and wire product forms primarily for orthopedic, trauma, spinal, dental, orthodontic, and cardiovascular applications. Other product forms can be made available by request.

Ti15Mo Alloy is formulated from two metals with greatly different elemental densities. To ensure complete melting and to minimize molybdenum segregation, these alloys are melted in a plasma arc furnace and re-melted in a VAR furnace.

Alloy can be supplied to ASTM F2066 in one of three different metallurgical conditions:

• Beta Annealed
• Alpha plus Beta Annealed
• Micrograined Alpha plus Beta Aged

The beta annealed condition consists of a fully recrystallized beta phase (bcc) structure. In this condition, the alloy has a modulus of elasticity that is about two-thirds the modulus of Ti-6Al-4V Alloy, along with considerably improved ductility and corrosion fatigue properties.

The alpha plus beta annealed condition consists of a beta phase (bcc) matrix with a significant volume fraction of alpha phase (hcp). Alpha plus beta Titanium 15Mo Alloys provide a good combination of strength and ductility, whereas beta Titanium 15Mo Alloy provides better ductility and formability.

Finally, a micro-grained alpha plus beta phase Ti-15Mo Alloy exhibiting very high notched corrosion fatigue strength but with remarkable ductility has been produced. This condition provides the highest level of tensile and high-cycle fatigue strengths, significantly exceeding typical Ti-6Al-4V or Ti-6Al-4V ELI levels.

Melting Range: 3,100 - 3,200° F (1,704 - 1,760° C)

Density: 0.179 lbs/cu. in.; 4.95 gm/cc

Beta Transus Temperature: 1,425° F (± 25 F°); 774° C (± 14 C°)

Elastic Modulus:

• 78 GPa in the beta annealed condition
• 106 GPa in the alpha plus beta annealed condition
• 114 GPa in the micrograined alpha plus beta aged condition

Heat treatments can be performed by methods typical for titanium alloys. Of particular concern for Ti-15Mo is the formation of the embrittling omega phase (ω) during cooling from temperatures near or above the beta transus. To avoid ω embrittlement, either rapid cooling (beta annealed condition) or slow cooling (alpha/beta condition) is required.

Beta Annealed Titanium 15Mo Alloy

1. Anneal: 1,475 - 1,800° F (802 - 982°C), 0.5-1 hour, rapid quench to below 1,025°F (552°C).

2. Stress Relief: 1,500°F (816°C), >10 minutes, rapid quench to below 1,025°F (552°C).

Titanium 15Mo Alloy that is processed above the beta transus and is slow cooled will have an alpha plus beta phase structure.

1. Anneal: 1,475 - 1,800°F (802 - 982°C), 0.5-1 hour, slow cool to below 1,025°F (552°C).

2. Stress Relief: 1,500°F (816°C), >10 minutes, slow cool to below 1,025°F (552°C).

Titanium 15Mo Alloy that is processed below the beta transus will have an alpha plus beta phase structure.

1. Anneal: 1,000 - 1,200°F (538 - 649°C), >4 hour, air cool

This alloy exhibits excellent hot and cold working properties, which are typical for beta titanium alloys 7,8. In the beta annealed condition, the low elastic modulus and exceptional ductility of this alloy are properties that contribute to an unusual springiness or "spring back" in forming and in machining.

It can be forged above the beta transus from temperatures above 1,500°F (816°C) or below the beta transus from temperatures between 1,200 - 1,375°F (649 -746°C). An immediate water quench minimizes the formation of omega phase in thin sections of this alloy, depending upon the microstructural properties desired.

Lork Group is a leading supplier of high-quality Ti-15Mo Titanium Alloy, offering premium-grade materials for aerospace, medical, and industrial applications. Contact us today for competitive pricing, technical specifications, and reliable supply solutions!

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