Inverse Hall-Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon |
| N.K. Mukhopadhyaya, F. Alib, S. Scudinoc, M. Samadi Khoshkhooc, M. Stoicac, V.C. Srivastavad, V. Uhlenwinkele, G. Vaughanf, C. Suryanarayanag and J. Eckertc,h
aDepartment of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, India bPakistan Institute of Engineering & Applied Science, P.O. Nilore, Islamabad, Pakistan cIFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany dMetal Extraction & Forming Division, National Metallurgical Laboratory, Jamshedpur-831007, India eInstitut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany fEuropean Synchrotron Radiation Facilities ESRF, BP 220, 38043 Grenoble, France gDept. of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL. 32816-2450, U.S.A. hTU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany |
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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-Petch 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. |
DOI: 10.12693/APhysPolA.126.543 PACS numbers: 61.44.Br |