Tailoring AZ91 laminates for combination of strength and ductility

Three types of laminates were designed by alternately stacking AZ91 extruded sheets in different states for extrusion to improve the mechanical properties. The tensile tests revealed that the combination of solid-solution-treated sheets with the aging-treated sheets achieved high tensile strength and ductility, i.e., ultimate tensile strength of similar to 386 MPa and elongation of similar to 19.8%, respectively. Electron backscatter diffraction (EBSD) and 1EM results indicated that the aging-treated layers with more nano-sized precipitates and small grain size provided high strength and reasonable ductility, while the solid-solution-treated layers with low dislocation density facilitated strain hardening. Also, the strong interface bonding between the successive layers played an important role in the enhanced ductility.

Automated summary

Three types of laminates were designed by stacking AZ91 extruded sheets in different states alternately, which showed that the combination of solid-solution-treated and aging-treated sheets achieved high tensile strength and ductility. The aging-treated layers with nano-sized precipitates and small grain size provided high strength and reasonable ductility, while the solid-solution-treated layers facilitated strain hardening with low dislocation density. The strong interface bonding between the layers played an important role in enhancing ductility.