Magnesium shows potential for bioimplant applications because of its high biocompatibility and equivalent bone strength. However, the high corrosion rate of magnesium and magnesium alloys in the physiological environment results in the rapid evolution of H₂ gas, which is lethal to the neighboring tissues. With an intention to reduce the corrosion rate, magnesium alloy AZ91D is reinforced with nanophase SiO₂ to fabricate surface composite by friction stir processing. The metallurgical characterization reveals the refinement of grains, fine dispersion of β phase and nanophase SiO₂ in the composite matrix. The surface characterization of the corrosion products depicts the formation of an adherent layer of corrosion products that are rich in calcium hydroxyapatite and calcium-magnesium phosphate. The combined consequence of metallurgical and corrosion phenomenon reduces the corrosion rate, aids bone growth, and augments implant-bone integration. The results demonstrate that AZ91D-SiO₂ composite is an effective material for bioimplant applications.

AZ91D-SiO₂surface composite for bioimplant applications

中文翻译：

---

生物植入物摩擦搅拌法制备镁合金表面复合材料AZ91D-SiO 2。

镁由于其高的生物相容性和同等的骨强度而显示出在生物植入物应用中的潜力。然而，镁和镁合金在生理环境中的高腐蚀速率导致H ₂气体的快速释放，这对邻近组织具有致命性。为了降低腐蚀速率，用纳米相SiO ₂增强了镁合金AZ91D，并通过摩擦搅拌工艺制备了表面复合材料。冶金学特征表明晶粒细化，β相细分散和纳米SiO ₂在复合矩阵中。腐蚀产物的表面特征描述了腐蚀产物粘附层的形成，该粘附层富含羟基磷灰石钙和磷酸钙镁。冶金和腐蚀现象的综合结果降低了腐蚀速率，有助于骨骼生长，并增强了植入物与骨的结合。结果表明，AZ91D-SiO ₂复合材料是生物植入应用的有效材料。

用于生物植入物的AZ91D-SiO ₂表面复合材料