为了揭示14H相的形成机理，制备并研究了18R LPSO单相Mg?Y?Zn(简称S18)合金经773 K退火100 h的显微组织演变。结果表明：铸态S18合金主要由18R相组成(其体积分数高于93%)，并含有少量的W相和α-Mg相。退火时，S18合金中的18R相保持稳定，未转变成14H LPSO结构。然而，在α-Mg相内部形成了14H层片相，其尺寸和体积分数随着退火时间的延长不断增大。TEM分析表明，14H相在α-Mg内基面堆垛层错区域独立形核。14H层片的增厚生长是界面控制过程，与基面台阶的形成密切联系。而14H层片的伸长生长属于扩散控制，与溶质元素的扩散有关。该18R单相合金中14H相的形成机理可通过反应式α-Mg'→α-Mg +14H表示。
Themicrostructural evolution of a 18R single phase (S18) alloy during annealing at 773 K for 100 h wasinvestigated in order to reveal the formation mechanism of 14H phase. The results showedthattheas-cast S18 alloy was composed of 18R phase (its volume fraction exceeds 93%), W particles andα-Mg phase. The 18Rphasein S18 alloy was thermallystable and was not transformed into 14Hlong period stacking ordered (LPSO) phaseduring annealing. However, 14H lamellasformed within tinyα-Mg slices, and their average size and volume fraction increased with prolongingannealing time. Moreover, the 14Hphaseis nucleated withinα-Mg independently on the basis of basalstacking faults (SFs). The broadening growth of 14Hlamellasis an interface-controlled process which involves ledges on basal planes,while the lengthening growth is a diffusion-controlled process and is associated with diffusion of solute atoms. The formation mechanism of 14Hphasein this alloy could be explained asα-Mg′→α-Mg+14H.
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