Here, Mg-0.4 wt%Sn based alloys containing different Y contents, Mg-0.4Sn-xY (x = 0, 0.7 and 2.0 wt%) alloys, were extruded into the sheets to systemically investigate the role of Y element on the microstructure, texture and mechanical properties of extruded Mg-0.4Sn alloy. We found that, with the Y addition, the average grain size gradually was reduced and the typical basal texture was transformed into the splitting one tilted to the extrusion direction. Moreover, the evidence of low number density and rough grain boundary cracks after tension indicated the strengthening in grain boundary cohesion with the Y addition. Besides more basal <a> slips, the activation of prismatic <a> slip and high intergranular strain propagation capacity were observed, which efficiently accommodated the sheet strain at room temperature. Those mentioned key factors contributed to the high room-temperature ductility of Mg-0.4Sn-0.7Y sheet. However, the formation and coarsening of Sn₃Y₅ and MgSnY phases were increasingly severe with increasing the Y addition to 2.0%. Those coarse secondary phases served as crack sources during tension deteriorating the ductility of Mg-0.4Sn-2.0Y sheet at room temperature. Therefore, we concluded that Y micro-alloying provided a new insight to achieve a superior room-temperature ductility of Mg-0.4Sn sheet.

此处，含有不同Y含量的Mg-0.4 wt％Sn基合金，Mg-0.4Sn- x Y（x 分别将0、0.7和2.0 wt％的合金挤压到板材中，以系统地研究Y元素对挤压Mg-0.4Sn合金的组织，织构和力学性能的影响。我们发现，添加Y后，平均晶粒尺寸逐渐减小，典型的基础组织转变为向挤压方向倾斜的裂口。此外，低密度的证据和拉力后粗糙的晶界裂纹的迹象表明，添加Y后晶界内聚力增强。除了更多的基底滑移之外，还观察到棱柱形滑移的激活和较高的晶间应变传播能力，从而有效地适应了室温下的板应变。这些提到的关键因素促成了Mg-0.4Sn-0的高室温延展性。7年工作表。然而，锡的形成和粗化₃ Y ₅和MgSnY相越来越严重，其Y添加量增加到2.0％。在室温下，那些粗大的次生相成为裂纹源，从而破坏了Mg-0.4Sn-2.0Y薄板的延展性。因此，我们得出的结论是，Y微合金化为实现Mg-0.4Sn薄板的出色室温延展性提供了新的见解。