The structure of a unique platelet precipitate with a three close-packed layer thickness, which occurred in a Mg-1at.%Zn-2at.%Gd alloy aged at low temperatures (<∼500 K), has been determined based on scanning transmission electron microscopy and first principles calculations. The platelet precipitate is constructed by well-defined Gd networks that cause significant atomic displacements in the adjacent close-packed layer, in which the atomic sites are preferentially occupied by Zn atoms. Local Zn concentrations at the reconstructed-layer have been successfully tuned according to a similar manner of Vegard's law by reference to the local Gd-Gd interatomic distance along the c-axis. Therefore, the present platelet precipitate is found to be not a simple ordered hexagonal-close-packed Mg-Gd as previously reported, but a reconstructed ternary Mg-Zn-Gd structure.

根据扫描透射率确定了在低温（<〜500 K）时效的Mg-1at。％Zn-2at。％Gd合金中出现的具有三个密堆积层厚度的独特血小板沉淀物的结构。电子显微镜和第一原理计算。血小板沉淀物是由定义明确的Gd网络构成的，该网络会在相邻的紧密堆积层中引起显着的原子位移，其中原子位置优先被Zn原子占据。通过参考沿c的局部Gd-Gd原子间距离，已根据Vegard定律的相似方式成功地调整了重构层的局部Zn浓度。-轴。因此，发现本发明的血小板沉淀物不是先前报道的简单有序的六方密堆积Mg-Gd，而是重构的三元Mg-Zn-Gd结构。