18R单相Mg-Y-Zn合金经773K退火过程中14H LPSO相的析出行为（英文）
发布时间：2018-09-03 13:23
【摘要】：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。
[Abstract]:In order to reveal the formation mechanism of 14H phase, the microstructure evolution of 18R LPSO single-phase Mg-Y-Zn (S18) alloy annealed at 773K for 100h was investigated. The results show that the as-cast S18 alloy mainly consists of 18R phase (volume fraction > 93%) and contains a small amount of W phase and 伪 -Mg phase. During annealing, the 18R phase in S18 alloy remained stable and did not change into 14H LPSO structure. However, a 14H lamellar phase was formed in the 伪 -Mg phase. The size and volume fraction of the 14H phase increased with the annealing time. Tem analysis showed that the thickening growth of the 14H phase in the stacking fault zone of 伪 -Mg was a process controlled by the interface. It is closely related to the formation of base steps. The elongation growth of 14H laminates is controlled by diffusion, which is related to the diffusion of solute elements. The formation mechanism of 14H phase in the 18R single phase alloy can be expressed by the reaction formula 伪 -Mg'n 伪 -Mg 14H.
【作者单位】： 河海大学力学与材料学院;河海大学海洋与近海工程研究院;扬州大学机械工程学院;东南大学材料科学与工程学院;
【基金】：Project(BK20160869)supported by the Natural Science Foundation of Jiangsu Province,China Project(GY12015009)supported by the Nantong Science and Technology Program,China Project(2015B01314)supported by the Fundamental Research Funds for the Central Universities,China Project(51501039)supported by the National Natural Science Foundation of China
【分类号】：TG146.22;TG166.4
本文编号：2220094
[Abstract]:In order to reveal the formation mechanism of 14H phase, the microstructure evolution of 18R LPSO single-phase Mg-Y-Zn (S18) alloy annealed at 773K for 100h was investigated. The results show that the as-cast S18 alloy mainly consists of 18R phase (volume fraction > 93%) and contains a small amount of W phase and 伪 -Mg phase. During annealing, the 18R phase in S18 alloy remained stable and did not change into 14H LPSO structure. However, a 14H lamellar phase was formed in the 伪 -Mg phase. The size and volume fraction of the 14H phase increased with the annealing time. Tem analysis showed that the thickening growth of the 14H phase in the stacking fault zone of 伪 -Mg was a process controlled by the interface. It is closely related to the formation of base steps. The elongation growth of 14H laminates is controlled by diffusion, which is related to the diffusion of solute elements. The formation mechanism of 14H phase in the 18R single phase alloy can be expressed by the reaction formula 伪 -Mg'n 伪 -Mg 14H.
【作者单位】： 河海大学力学与材料学院;河海大学海洋与近海工程研究院;扬州大学机械工程学院;东南大学材料科学与工程学院;
【基金】：Project(BK20160869)supported by the Natural Science Foundation of Jiangsu Province,China Project(GY12015009)supported by the Nantong Science and Technology Program,China Project(2015B01314)supported by the Fundamental Research Funds for the Central Universities,China Project(51501039)supported by the National Natural Science Foundation of China
【分类号】：TG146.22;TG166.4
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