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

被引：373

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

页码：179 / 181

页数：3

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