Formation of quasicrystals in bulk glass forming Zr-Cu-Ni-Al alloys

被引：370
|
作者：
Koster, U
Meinhardt, J
Roos, S
Liebertz, H
机构：
[1] Universität Dortmund, FB Chemietechnik, AG Werkstoffe und Korrosion
来源：
APPLIED PHYSICS LETTERS | 1996年 / 69卷 / 02期
关键词：
D O I：
10.1063/1.117364
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Zr65Cu17.5Ni10Al7.5 as well as Zr69.5Cu12Ni11Al7.5 belong to the best glass forming alloys known. Glass transition temperatures of melt-spun ribbons are 372 and 360 degrees C, respectively. TEM and x-ray analysis of samples annealed above the glass transition temperature exhibit the formation of quasicrystalline microstructures with small amounts of crystalline phases. The metastable icosahedral phase is primitive with a quasilattice constant a=0.253 nm; its composition as determined by EDX is close to Zr69.5Cu12Ni11Al7.5. In both glasses, growth of the quasicrystals has been observed to be time-dependent (r(proportional to)t(1/2)), thus indicating a diffusion controlled transformation.
引用
收藏
页码：179 / 181
页数：3
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