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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2004); 20040822-26; Sendai(JP) >Formation of quasicrystals in Zr-Ti-Nb-Cu-Ni-Al alloys by casting or annealing
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Formation of quasicrystals in Zr-Ti-Nb-Cu-Ni-Al alloys by casting or annealing

机译：通过铸造或退火在Zr-Ti-Nb-Cu-Ni-Al合金中形成准晶体

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摘要

Three Zr-Ti-Nb-Cu-Ni-Al alloys were prepared by melt spinning and/or copper mould casting to realize different cooling rates and, therefore, different microstructures. Depending on the alloy, cast bulk samples with a glassy and/or an icosahedral quasicrystalline phase are obtained. The devitrification of glassy samples is characterized by the formation of a metastable quasicrystalline phase during the first stage of the crystallization process. The higher the ability of an alloy to form a quasicrystalline phase during casting, the smaller is the size of the quasicrystalline precipitates formed by annealing the glassy phase of the same composition (realized by higher cooling rates). This is also connected with a decrease in thermal stability. It is assumed that the existence or the absence of an icosahedral short-range order in the supercooled liquid may be responsible for the different (quasi)crystallization behaviour.
机译：通过熔融纺丝和/或铜铸模制备了三种Zr-Ti-Nb-Cu-Ni-Al合金，以实现不同的冷却速率，因此具有不同的显微组织。根据合金的不同，可以得到具有玻璃态和/或二十面体准晶相的铸造块状样品。玻璃状样品的失透特征在于在结晶过程的第一阶段形成了亚稳态准晶相。合金在铸造过程中形成准晶相的能力越高，通过退火相同组成的玻璃相而形成的准晶沉淀物的尺寸越小（通过更高的冷却速率实现）。这也与热稳定性的降低有关。假定过冷液体中是否存在二十面体短程有序可能是导致不同（准）结晶行为的原因。

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