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用“玻璃覆盖、熔盐净化及热循环”复合方法实现了大块Al-Mn-(Si;B)熔体的深过冷,获得了100K的过冷度,并自发生成准晶相.研究了准晶相的形核及生长形貌特点,结果表明,准晶相为初生凝固相.初生准晶相的形成归因于推晶相的固液界面能低于竞争晶体相.
The deep overcooling of bulk Al-Mn- (Si; B) melt was achieved by the composite method of “glass coating, molten salt purification and thermal cycling”. The undercooling of 100K was obtained and a quasicrystalline phase spontaneously occurred. The nucleation and growth morphology of the quasicrystalline phase were studied. The results show that the quasicrystal phase is the primary solidified phase. The formation of the nascent quasi-crystalline phase is attributed to the fact that the solid-liquid interface of the push phase is lower than that of the competing crystal phase.