Constructing surface coatings is an effective way to improve the corrosion resistance and biocompatibility of magnesium alloy bioabsorbable implants. In this present work, a titanium oxide coating with a thickness of about 400 nm was successfully prepared on a MgZn alloy surface via a facile magnetron sputtering route. The surface features were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the contact angle method. The corrosion behavior and biocompatibility were evaluated. The results indicated that the amorphous TiO₂ coating with a flat and dense morphology was obtained by magnetron-sputtering a titanium oxide target. The corrosion current density decreased from 1050 (bare MgZn alloy) to 49 μA/cm² (sample with TiO₂ coating), suggesting a significant increase in corrosion resistance. In addition, the TiO₂ coating showed good biocompatibilities, including significant reduced hemolysis and platelet adhesion, and increased endothelial cell viability and adhesion.

The quasi-static and dynamic impact compression tests of the TA31 titanium alloy were conducted at the strain rates from 0.001 s⁻¹ to 4000 s⁻¹ and deformation temperatures from 293 K to 773 K, and the TA31 titanium alloy showed typical elastic-plastic characteristics. In the initial stage of compression (elastic deformation), the stress and strain are proportional, and the stress–strain curve is a straight line. In the plastic deformation stage, the flow stress decreases significantly with the increase of deformation temperature, while the strain rate has no significant effect on the flow stress during dynamic compression. A constitutive model has been established to predict the flow stress, and the relative error is 2.32%. It is shown by observing the microstructure that when the deformation temperature is 293 °C, and the strain rate reaches 1600 s⁻¹, a shear band with an angle of about 45° to the axial direction of the specimen appears, and the severe shear deformation makes the α phase in the shear band fibrous and contains high-density dislocations. The formation process of the shear band and its influence on fracture are analyzed and discussed.

In the present study, isothermal compression tests are conducted for a near-α Ti–3.3Al–1.5Zr–1.2Mo–0.6Ni titanium alloy at deformation temperatures ranging from 1073 K to 1293 K and strain rates ranging from 0.01 s⁻¹ to 10 s⁻¹ on a Gleeble-3500 thermomechanical compressor. The results show that, in the initial stage of the compression, the flow stress rapidly increases to a peak value because of elastic deformation, and then the alloy enters the plastic deformation stage and the flow stress slowly decreases with the increase in strain and tends to gradually stabilize. In the plastic deformation stage, the flow stress significantly decreases with the increase in the deformation temperature and the decrease in strain rate. A flow stress model considering the contribution of the strain is established, and the relative error between the calculated and the experimental values is 3.72%. The flow stress model has higher precision and can efficiently predict the flow behavior in the isothermal compression of the alloy. Furthermore, the processing map of the Ti–3.3Al–1.5Zr–1.2Mo–0.6Ni alloy is drawn. Based on the processing map, the influence of process parameters on power dissipation efficiency and stability parameters is analyzed, and the optimized hot working process parameters are pointed out.

Magnesium alloy represents a typical category of biodegradable medical materials. However, the poor corrosion resistance and rapid degradation have significantly hindered the clinical adoption of magnesium alloy implants. This paper puts forward a method to improve the corrosion resistance of magnesium alloy by using an Fe-based composite coating. The microstructure and composition of the coating were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive spectroscopy (EDS). The corrosion resistance was evaluated through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements conducted in simulated body fluid, while the degradation behavior of the samples was evaluated by examining the hydrogen evolution volume and corrosion morphology during immersion tests. The results indicate that the composite coating exhibits a dual-layer structure, consisting of an amorphous carbon–fluorine transition layer and an iron-rich surface layer. After coating treatment, the corrosion current density of magnesium alloy decreased from 1.38 × 10⁻⁴ to 3.41 × 10⁻⁶ A/cm². Throughout a 28-day immersion period, the composite-coated sample demonstrated a remarkably low hydrogen evolution rate and maintained a smooth, intact surface. Furthermore, hemolysis and platelet adhesion tests confirmed the outstanding blood compatibility of the composite-coated magnesium alloy, showing an ultralow hemolysis rate of 0.1% and minimal platelet adhesion with well-preserved morphology.