Development of Biomedical Mg-1. 0 Ca-0. 5 Zn-0. 1 Y-0. 0 3 Mn (at %) All oy by Rap idly Solid ified Powder Metallur gy Pro cessing

We investigated the alloy composition of Mg-Ca-Zn alloys suitable for rapidly solidified powder metallurgy (RS PM) processing and tried t o 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. 0 Ca-0. 5 Zn (at%) in ternary Mg-Ca-Zn alloys. An Mg-1. 0 Ca-0. 5 Zn RS P M alloy with combined additions of 0.1 at % Y and 0.03 at% Mn exhibited excellent performance with a tensile yield strength of 376 & PLUSMN;17 MPa, an elongation of 14.1 & PLUSMN;3.1 %, and a corrosion rate of 0.46 & PLUSMN;0.04 mm ?year-1 when immersed in HBSS, resulting i n the achievement of our target properties. Especially the yield strength of the Mg-1. 0 Ca-0. 5 Zn-0. 1 Y-0. 0 3 Mn 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.