Mg Alloys Development and Surface Modification for Biomedical Application

Surface modifications through dealloying of Fe–Mn and Fe–Mn–Zn alloys developed to create tailorable, nanoporous, bioresorbable surfaces

“…The heat treatment step appears to simply allow for longer diffusion time of Zn and Mn species to the surface (an increase of about 3.76wt% of Mn with heat treatment). Dealloying was found to be largely controlled by the etching rate and length of etching time, where shorter times at STEP 4 (<1 hour) at room temperature achieved the wide-spread nanoporosity seen in figure 7, mid-length times (1-4 hours) created ligament structures similar to that reported by other authors with various other alloys (figure 9),[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] while much longer etching times always resulted in a dendritic, iron-rich skeleton, for cast alloys. In general, HCl preferentially targeted both of the less noble manganese and zinc elements, especially the interdendritic regions that are richer in manganese…”

“…[10] Customarily, mechanical roughening treatments can include machining, polishing, and blasting with different types of particles, whereas chemical treatments typically comprise of wet chemical etching and passivation treatments. [11][12][13] Alla et al…”

Microstructural changes in an extruded Mg Zn Y alloy reinforced by quasicrystalline I-phase by small additions of calcium, manganese and cerium-rich mischmetal

“…Based on the effect on other magnesium alloys, calcium, manganese and cerium-mischmetal (CeMM) were chosen as alloying elements. Calcium and RE additions refine the microstructure of magnesium alloys and improve the strength at room and high temperatures through the formation of hard intermetallic phases [2,[15][16][17][18][19][20][21]. Moreover, both elements contribute to randomize the basal texture [22].…”