The laminate structure was applied to improve the mechanical properties of Mg-8.0Gd-3.0Y-0.5Zr alloy. 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 strength-ductility 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.

应用层压结构以改善Mg-8.0Gd-3.0Y-0.5Zr合金的机械性能。通过摩擦搅拌处理，制得了仅具有不同的晶粒分布位置的两种层压结构。结果表明，与均质结构和双层结构相比，三层结构样品表现出优异的强度-延性协同作用。增强的机械性能归因于异质变形诱导（HDI）应力增强和应变硬化，这可以通过增加界面数量来增强。这些观察结果表明界面数量在设计层压结构中的关键作用。