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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Abstract
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: | http://dx.doi.org/10.1063/1.4831737 |
| 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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