Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces |
| T.P. Yadava, S.S. Mishraa, S.K. Pandeya, D. Singha, M. Loweb, R. Tamurac, N.K. Mukhopadhyayd, O.N. Srivastavaa, R. McGrathb and H.R. Sharmab
aHydrogen Energy Centre, Department of Physics (Centre of Advance Studies) bSurface Science Research Centre and Department of Physics, The University of Liverpool, Liverpool, L69 3BX, UK cDepartment of Materials Science and Technology, Tokyo University of Science, Noda 278-8510, Japan dDepartment of Metallurgical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi, 221005, India |
| Full Text PDF |
| In the present investigation, we have studied leaching on polygrain Al-based quasicrystalline (i-Al63Cu25Fe12) as well as crystalline (B2 phase; Al55Cu30Fe15) alloy surfaces using a 10 mole NaOH solution. The surface was leached at varying times from 30 min to 8 h and subsequently characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Leaching of the samples for 30 min generated a homogeneous layer. However further leaching for 1-8 h yielded nano-size particles on the surface. Spherical microstructure has been observed on the Al-Cu-Fe crystalline surface whereas on the quasicrystalline surface a petal-like microstructure appeared. The implications of the evolution of different microstructures in the context of structure, stability and activity are discussed. The results are compared with the microstructure of leached polygrained samples containing a mixture of different surface orientations. |
DOI: 10.12693/APhysPolA.126.629 PACS numbers: 61.44.Br; 81.16.Hc; 61.66.Dk; 68.37.Hk |