Inverse Hall Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
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| Title |
Inverse Hall Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon
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| Creator |
Mukhopadhyay, N K
Ali, F Scudino, S Khoshkhoo, M S Stoica, M Srivastava, V C Uhlenwinkel, V Vaughan, G Suryanarayana, C Eckert, J |
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| Subject |
Materials Science
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| Description |
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.
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| Publisher |
POLISH ACAD SCIENCES INST PHYSICS, AL LOTNIKOW 32-46, PL-02-668 WARSAW, POLAND
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| Date |
2014-08
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://eprints.nmlindia.org/7118/1/Mukhopadhyay%2C_N_K.pdf
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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| Relation |
http://eprints.nmlindia.org/7118
http://eprints.nmlindia.org/7118/ |
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