Microstructure and Mechanical Properties of β-Titanium Ti-15Mo Alloy Produced by Combined Processing including...

Area of Science:

• Materials Science
• Metallurgy
• Biomaterials Engineering

Background:

• Metastable β-titanium alloys are crucial for medical applications.
• Enhancing strength and fatigue properties is a key research objective.
• Severe plastic deformation is a promising technique for strengthening titanium alloys.

Purpose of the Study:

• To investigate the effect of combined processing on Ti-15Mo alloy microstructure and mechanical properties.
• To evaluate the potential of equal channel angular pressing-conform and drawing for producing enhanced titanium alloy rods.
• To achieve an ultrafine-grained structure in a medical metastable β-titanium alloy.

Main Methods:

• Combined processing of equal channel angular pressing-conform and drawing.
• Deformation of a medical metastable β-titanium alloy (Ti-15Mo, ASTM F2066) in the (α + β) state.
• Microstructural analysis to determine the size of structural elements.
• Mechanical testing to evaluate tensile strength, ductility, and endurance limit.

Main Results:

• Production of long-length rods (1500 mm) of Ti-15Mo alloy.
• Obtained an ultrafine-grained structure with an average grain size below 100 nm.
• Achieved high tensile strength (σ_uts = 1590 MPa) and ductility (δ = 10%).
• Recorded a significant increase in the endurance limit under tension-compression (σ_-1 = 710 MPa).

Conclusions:

• Combined processing is effective for enhancing the properties of metastable β-titanium alloys.
• The developed method enables the production of high-performance titanium alloy rods for medical applications.
• The achieved combination of strength, ductility, and fatigue resistance is notable for biomedical implants.