Comprehensive analysis of corrosion resistance and micro-machinability properties of α plus β and β phase novel Ti-30Zr-5Mo biomedical alloys

The biocompatibility and corrosion resistance of biomedical alloys are crucial to preventing adverse tissue reactions and maintaining implant integrity. Additionally, machinability is essential for producing implants with complex shapes and high surface quality. This study investigates the biocompatibility and micro-machinability of Ti-30Zr-5Mo alloys with different phase compositions: forged (mostly alpha), solution-treated at 600 degrees C (alpha + beta), and 700 degrees C (only beta). Biocompatibility was evaluated through electrochemical corrosion tests under in-vitro conditions, while machinability was assessed via micro-milling tests. The corrosion rate of the beta-phase alloy was approximately 3.5 times lower than the forged (9.08 nm/year) and 600 degrees C-treated alloys (9.85 nm/year), attributed to its stable and uniform structure. The forged sample exhibited the lowest corrosion resistance due to its heterogeneous alpha + beta structure, with microgalvanic corrosion observed. Additionally, the forged alloy, with a high alpha phase content, showed higher cutting forces (21.5 N) and burr widths (230 mu m). As the solution treatment temperature increased, the alpha phase decreased, leading to lower cutting forces and burr widths. The beta-phase alloy (700 degrees C) showed about a 60 % reduction in cutting forces (8.5 N) and an 8-fold decrease in burr widths (28 mu m) in up-milling compared to forged sample, indicating superior machinability under micro conditions.

Dergi

JOURNAL OF MANUFACTURING PROCESSES

Yıl

2025

Cilt

141

Sayfa

445-460

ISSN

1526-6125

eISSN

2212-4616

DOI

10.1016/j.jmapro.2025.02.074

WoS UID

WOS:001442829900001