Abstract
In the present study, the effects of bioactive glass (64SiO2-31CaO-5P2O5) reinforcement on the microstructure, mechanical properties, and in-vitro corrosion characteristics of AZ91-bioactive glass composite wire, produced via friction stir back extrusion (FSBE), were investigated. The findings reveal that the bioactive glass reinforcement phase, exhibiting a gradient distribution in the AZ91 matrix and the α-Mg and β-Mg17Al12 phases, predominantly appear in the extruded samples. Additionally, a higher rotational speed during FSBE reduces bioactive glass powder agglomeration within the AZ91 matrix. The optimal yield strength, ultimate tensile strength, and corrosion resistance were observed in the FSBE-processed composite containing 5 vol% bioactive glass. It was revealed that employing a rotational speed of 1200 rpm and an extrusion speed of 30 mm/min during FSBE on as-cast AZ91 alloy with 5 vol% bioactive glass led to an 86 % enhancement in corrosion resistance in simulated body fluid (SBF) compared to the as-cast alloy. Incorporating 5 vol% bioactive glass into the homogenized AZ91 alloy increased corrosion resistance by 98 %. Moreover, raising the rotational speed from 800 to 1200 rpm resulted in a 24 % increase in corrosion resistance, reaching a 0.0427 mm/year rate.
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