Why do medical implants prefer titanium alloys?

Titanium alloys possess excellent biological inertness without releasing toxic ions inside human tissues, effectively avoiding rejection reactions. Their elastic modulus is close to human bone, reducing stress shielding that weakens surrounding bone tissue long-term. The surface oxide film prevents corrosion from body fluid and blood. They support precise machining and laser welding for complex implant shapes, and can be surface treated to improve cell adhesion, which guarantees stable and safe long-term implantation inside the human body.