Simultaneously improving strength and ductility through laminate structure design in Mg–8.0Gd–3.0Y-0.5Zr alloys

摘要

The laminate structure was applied to improve the mechanical properties of Mg-8.0 Gd-3.0 Y-0.5 Zr alloys.Two types of laminate structures only with different distribution positions of fine grains were produced by friction-stir processing.Results show that the trilayer structure sample exhibits an excellent strengthductility synergy compared to the homogenous structure and bilayer structure.The enhanced mechanical properties are resulted from the hetero-deformation induced(HDI)stress strengthening and strain hardening which would be enhanced by increasing the quantity of interface.These observations suggest a crucial role of the number of interfaces in designing the laminate structure.