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Quasicrystal formation and phase transitions by ball milling

✍ Scribed by J. Eckert; L. Schultz; K. Urban

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
456 KB
Volume
133
Category
Article
ISSN
0921-5093

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✦ Synopsis

Quasicrystalline AI-Cu-Mn powder has been prepared by mechanical alloying. The quasicrystalline phase forms directly by milling via a solid-state reaction from the crystalline elemental powders. Singlephase quasicrystalline material is obtained for (15-25) at.% Cu and (10-20) at.% Mn. Besides, twophase regions of quasicrystalline phase and crystalline material exist. The results are compared with data for melt-spun material. The milling conditions strongly affect the phase formation. For low milling intensity an amorphous phase instead of quasicrystalline material forms. High-intensity milling results in the formation of crystalline powder. The various phases can be transformed into each other by additional milling at higher or lower milling intensity. Possible mechanisms are proposed.

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Ball-milling is a way of inducing phase transformations, chemical reactions, and changes in the reactivity of solids. It is a complex process for which several models have been developed to predict the evolution of systems and to describe its physics. These models sometimes empirically need experime