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

Mukhopadhyay, N K and Ali, F and Scudino, S and Khoshkhoo, M S and Stoica, M and Srivastava, V C and Uhlenwinkel, V and Vaughan, G and Suryanarayana, C and Eckert, J (2014) Inverse Hall Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon. Acta Physica Polonica A , 126(2) (IF-0.604). pp. 543-548.

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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.

Item Type:Article
Official URL/DOI:
Divisions:Material Science and Technology
ID Code:7118
Deposited By:Sahu A K
Deposited On:11 Nov 2014 12:27
Last Modified:04 May 2016 14:30
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