Self-organized porous and tubular oxide layers on TiAl alloys |
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| Institution: | 1. College of Chemical Engineering, Sichuan University, Chengdu 610065, China;2. College of industrial manufacturing, Chengdu University, Chengdu, China;1. Research Group for Molecular Biology and Nanomedicine, Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czechia;2. Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, CZ-612 00 Brno, Czechia;3. Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. Legii 565, CZ-530 02 Pardubice, Czechia;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Center of Advanced Manufacturing and Material Processing, Department of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Department of Mechanical Convergence Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;4. Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;5. Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran;1. Central European Institute of Technology, Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic;2. Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic;3. College of Materials, Xiamen University, 422 S Siming, Siming Dictrict, Xiamen 361005, China |
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| Abstract: | The present paper describes the electrochemical fabrication of nanostructured oxide films on a TiAl intermetallic compound. The alloy is investigated under conditions where the individual alloying elements show the growth of ordered oxide structures, i.e. anodization is carried out in fluoride containing and fluoride free H2SO4 electrolytes. In 1 M H2SO4 the alloy shows randomly ordered nanoporous oxide structures while in HF-containing electrolytes highly ordered films can be formed. The key factor that affects the morphology is the anodizing potential. At low potentials (∼10 V) self-organized nanopores are formed whereas at higher potentials (∼40 V) separation of the pore walls and therefore formation of nanotubes can be observed. The results clearly indicate that on TiAl a wide range of nanoscale morphologies can be achieved ranging from random porous to organized pores to organized tubes. |
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