Quasicrystalline phases and their approximants in Al-Mn-Zn alloys

被引：18

作者：

Singh, A ^{[1
]}

Ranganathan, S ^{[1
]}

Bendersky, LA ^{[1
]}

机构：

[1] NIST,GAITHERSBURG,MD 20899

来源：

ACTA MATERIALIA | 1997年 / 45卷 / 12期

关键词：

D O I：

10.1016/S1359-6454(97)00103-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two Al-Mn-Zn alloys in melt-spun condition have been studied by transmission electron microscopy. The Al24Mn5Zn alloy was found to be fully icosahedral, while the Al12Mn2.9Zn alloy gave rise to decagonal quasicrystal. The decagonal phase grey in clusters with an orientation relationship between the grains suggesting nucleation on an icosahedral seed. On annealing at 500-600 degrees, the quasicrystalline phases transformed to a body centered orthorhombic phase L (a = 1.24, b = 1.26 and c = 3.05 nm) with a high density of planar defects. This phase transforms to an ordered and defect free monoclinic phase M, a superlattice structure of L (a = c = 1.77, b = 3.05 nm and beta = 89.1 degrees). The L phase is shown to be a rational approximant of the icosahedral phase. The interrelationship among quasicrystalline phases and their rational approximants in Al-Mn-Zn system Ire highlighted. (C) 1997 Acta Metallurgica Inc.

引用

页码：5327 / 5336

页数：10

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