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

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 (2013) Grain size softening effect in Al62.5Cu25Fe12.5 nanoquasicrystals. Applied Physics Letters, 103 (IF-3.79). p. 201914.

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Inverse Hall-Petch (IHP) behavior in nano-quasicrystalline Al 62.5 Cu 25 Fe 12.5 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.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Nano-quasicrystal, ball milling, inverse Hall-Petch, hardness, grain size
Divisions:Metal Extraction and Forming
ID Code:6750
Deposited By:Dr. V.C. Srivastava
Deposited On:30 Nov 2013 11:32
Last Modified:30 Nov 2013 11:32
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