Title

Grain size softening effect in Al62.5Cu25Fe12.5 nanoquasicrystals

Authors

Authors

N. K. Mukhopadhyay; F. Ali; S. Scudino; M. S. Khoshkhoo; M. Stoica; V. C. Srivastava; V. Uhlenwinkel; G. Vaughan; C. Suryanarayana;J. Eckert

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

HALL-PETCH RELATION; NANOCRYSTALLINE MATERIALS; QUASI-CRYSTALS; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; PHASE; NANOINDENTATION; BEHAVIOR; Physics, Applied

Abstract

Inverse Hall-Petch (IHP) behavior in nano-quasicrystalline Al62.5Cu25Fe12.5 is reported. Powders with varying grain sizes were produced by mechanical milling of spray-formed quasicrystals. The hardness of the milled powders increased with decreasing grain size down to about 40 nm and decreased with further refinement, demonstrating the IHP behavior. This critical grain size was found to be larger compared to other metallic nanocrystalline alloys. This IHP behaviour has been attributed to the structural complexity in quasicrystals and to thermally activated shearing events of atoms at the grain boundaries. (C) 2013 AIP Publishing LLC.

Journal Title

Applied Physics Letters

Volume

103

Issue/Number

20

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000327818700041

ISSN

0003-6951

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