Probing the Phase Composition and Surface Roughness in the Biological Response of Additively Manufactured Titanium...

Area of Science:

• Biomaterials Science
• Materials Engineering
• Additive Manufacturing

Background:

• Titanium alloys, particularly Ti-6Al-4V, are crucial for bioimplants due to their high strength-to-weight ratio.
• Additive manufacturing, such as laser powder bed fusion (LPBF), accelerates implant production.
• Biological performance of implants depends on surface characteristics and phase composition, influenced by manufacturing methods.

Purpose of the Study:

• To investigate the impact of surface roughness and phase composition on the biological performance of Ti-6Al-4V.
• To compare biological outcomes between implants produced via LPBF and those post-processed with hot isostatic pressing (HIP).

Main Methods:

• Experimental comparison of Ti-6Al-4V samples produced by LPBF and HIP.
• Assessment of biological performance based on surface roughness and phase composition differences.
• Evaluation of cell viability on as-built LPBF and HIP-ed samples.

Main Results:

• Surface roughness was identified as a more significant factor than phase composition in determining biological performance.
• Rougher surfaces demonstrated a positive correlation with improved biological performance.
• Hot isostatic pressing (HIP) resulted in enhanced cell viability compared to as-built LPBF samples.

Conclusions:

• Surface topography plays a critical role in the biological success of additively manufactured Ti-6Al-4V bioimplants.
• HIP post-processing can improve the biological response of LPBF-manufactured titanium implants.
• Optimizing surface roughness is key for enhancing bioimplant integration and function.