Abstract
We investigated the alloy composition of Mg-Ca-Zn alloys suitable for rapidly solidified powder metallurgy (RS PM) processing and tried to develop biomedical Mg-Ca-Zn RS PM alloys with high strength, high ductility, and high corrosion resistance. The alloy composition suitable for RS PM processing was Mg-1.0Ca-0.5Zn (at%) in ternary Mg-Ca-Zn alloys. An Mg-1.0Ca-0.5Zn RS PM alloy with combined additions of 0.1 at% Y and 0.03 at% Mn exhibited excellent performance with a tensile yield strength of 376±17 MPa, an elongation of 14.1±3.1%, and a corrosion rate of 0.46±0.04 mm·year-1 when immersed in HBSS, resulting in the achievement of our target properties. Especially the yield strength of the Mg-1.0Ca-0.5Zn-0.1Y-0.03Mn RS PM alloy developed in this study was higher than that of previously reported Mg-Zn-Ca(-Mn-Zr) or Mg-Ca-Zn(-Mn-Zr) ingot metallurgy (IM) alloys, which were produced by single extrusion, double extrusion or severe plastic deformation (SPD) of cast ingots.
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