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 ꞏyear-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.

Automated summary

We investigated the alloy composition suitable for rapidly solidified powder metallurgy (RS PM) processing of Mg-Ca-Zn alloys and developed biomedical Mg-Ca-Zn RS PM alloys with high strength, high ductility, and high corrosion resistance. An Mg-1.0 Ca-0.5 Zn RS PM alloy with combined additions of 0.1 at% Y and 0.03 at% Mn exhibited excellent performance, surpassing previous IM alloys, 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 ꞏyear-1 when immersed in HBSS.