Long-range chemical ordering in Al-Cu-Fe, Al-Cu-Mn, and Al-Cu-Cr quasicrystals
Long-range chemical ordering in Al-Cu-Fe, Al-Cu-Mn, and Al-Cu-Cr quasicrystals
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Al-Cu-Fe、Al-Cu-Mn 和 Al-Cu-Cr 准晶的长程化学有序性
DOI：
10.1557/jmr.1990.0062
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发表时间：
1990
影响因子：
2.7
通讯作者：
F. Spaepen
中科院分区：
文献类型：
--
作者：
S. Ebalard;F. Spaepen
本文报道了Al-Cu-Fe准晶的F -型有序度和稳定性与淬火速率和成分的关系。在Al-Cu-Mn和Al-Cu-Cr系中，只有亚稳准晶能形成，通过熔体快淬得到无序的二十面体相，退火后观察到P → F型有序。同时观察到的漫散射和有序的演变。三元Al-Cu-TM合金的准晶相为P型二十面体和十面体，与二元Al-TM合金的准晶相结构相似。在二十面体相的位错已被成像的应变场对比度和高分辨率。
The dependence of the F -type order and the stability of Al–Cu–Fe quasicrystals on quenching rate and composition are reported. In the Al–Cu–Mn and Al–Cu–Cr systems, where only metastable quasicrystals can be formed, a disordered icosahedral phase is obtained by melt-spinning, and P ⇉ F -type ordering is observed after annealing. Simultaneous evolution of the diffuse scattering and the ordering is observed as well. The quasicrystalline phases, P -type icosahedral as well as decagonal, in the ternary Al–Cu–TM alloys are structurally similar to those in the binary Al–TM alloys. Dislocations in the icosahedral phase have been imaged both by their strain field contrast and in high resolution.