Developing new Mg alloy as potential bone repair material via constructing weak anode nano-lamellar structure

• DOI: 10.1016/j.jma.2022.08.011
• Publication Date: 2022-09-27T03:01:58Z
• Authors: Jinshu Xie; Lele Wang; Jinghuai Zhang; Liwei Lu; Zhi Zhang; Yuying He; Ruizhi Wu
• Keywords: Ductility (Earth science)

The mechanics-corrosion and strength-ductility tradeoffs of magnesium (Mg) alloys have limited their applications in fields such as orthopedic implants. Herein, a fine-grain structure consisting weak anodic nano-lamellar solute-enriched stacking faults (SESFs) with the average thickness 8 nm spacing 16 is constructed an as-extruded Mg96.9Y1.2Ho1.2Zn0.6Zr0.1 (at.%) alloy, obtaining high yield strength (YS) 370 MPa, excellent elongation (EL) 17%, low corrosion rate 0.30 mm y−1 (close to that high-pure Mg) uniform mode. Through scanning Kelvin probe force microscopy (SKPFM), one-dimensional nanostructured SESFs are identified anode (∼24 mV) for first time. resistance mainly related nature structure, leading more potential distribution weaken galvanic release abundant Y3+/Ho3+ from form protective film outer Ca10(PO4)6(OH)2/Y2O3/Ho2O3 layer (thickness percentage this layer: 72.45%). For comparison, as-cast alloy containing block 18R long period ordered (LPSO) phase heat-treated fine lamellar 18R-LPSO (thickness: 80 nm, spacing: 120 nm) also studied, characteristics phase, former cathode latter (37-90 mV), distinguished under same composition. Ultimately, we put forward idea designing Mg mechanical anti-corrosion properties by constructing "homogeneous strengthening microstructure", structure.