Title

Inverse Hall Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon

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

Acta Phys. Pol. A

Keywords

NANOCRYSTALLINE MATERIALS; GRAIN-SIZE; PLASTIC-DEFORMATION; NANOINDENTATION; PHASE; ZN; TEMPERATURE; Physics, Multidisciplinary

Abstract

The structural and mechanical stability of quasicrystals are important issues due to their potential for possible applications at high temperatures and stresses. The aim of the present work is, therefore, to review the earlier works on conventional crystalline and quasicrystalline materials and also to report the results and the analysis on the Hall Petch and inverse Hall Petch like behavior of nanoquasicrystalline Al62.5Cu25Fe12.5 alloys. It was observed that, at large grain sizes, the hardness increases with decreasing grain size, exhibiting the conventional Hall Petch relationship, whereas for smaller grains, inverse Hall Petch behavior was identified. The inverse Hall Fetch behavior in the nanoquasicrystalline phase could be attributed to thermally activated shearing of the grain boundaries, leading to grain boundary sliding in nanostructures of quasicrystalline grains. These results were analyzed based on the dislocation pile-up model as well as the grain boundary shearing models applicable to nanomaterials.

Journal Title

Acta Physica Polonica A

Volume

126

Issue/Number

2

Publication Date

1-1-2014

Document Type

Article; Proceedings Paper

Language

English

First Page

543

Last Page

548

WOS Identifier

WOS:000342544700031

ISSN

0587-4246

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