Grain Refinement after Various Thermo-Mechanical Treatments in AZ80 and ZK60 Magnesium Alloys

Abstract

The eect of thermal processing prior to severe plastic deformation by extrusion and swaging on grain renement in ZK60 and AZ80 alloys was studied. The alloys received in direct-chill cast condition were homogenized at 415• C and annealed (over-aged) at temperatures from 200 to 380• C. Both the direct-hill cast and over-aged conditions were extruded at T = 300• C using an extrusion ratio of ER = 19. Hot extrusion resulted in substantial grain renement in both cases, the eect being stronger in the over-aged material. The extruded bars were severe plastically deformed at 250• C by swaging. Swaging rened further the grain size depending on the deformation ratio (number of passes). At optimal processing conditions the grain size was 450 nm and 570 nm for the AZ80 and ZK60 alloys, respectively.

Effect of Rotary Swaging on Microstructure and Mechanical Properties of an AZ31 Magnesium Alloy

“…Nano‐sized Al x Nd y precipitates in the alloy containing 0.5 and 1.0 wt% of Nd significantly improved the mechanical properties. Ultrafine‐grained AZ80 and ZK60 alloys were achieved by Ryspaev et al using hot extrusion followed by RSW of overaged materials . Fine precipitates present in the alloys acted as nuclei during dynamic recrystallization.…”

“…Ultrafine-grained AZ80 and ZK60 alloys were achieved by Ryspaev et al using hot extrusion followed by RSW of overaged materials. [14] Fine precipitates present in the alloys acted as nuclei during dynamic recrystallization. Rotary swaged magnesium alloys were also considered for biomedical applications.…”