Analysis of nanocrystallization process in Fe73.5Cu1Nb3Si15.5B7 alloys by cumulant expansion of EXAFS

✍ Scribed by Y. Swilem

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 306 KB
• Volume: 371
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2005.10.109

✦ Synopsis

Amorphous-nanocrystalline transformation in Fe 73.5 Cu 1 Nb 3 Si 15.5 B 7 is investigated by extended X-ray absorption fine structure (EXAFS) and analysed by the cumulant method, which allows a refined study of parameters that are able to describe the local structure during the nanocrystallization. The nearest-neighbour interatomic distance and coordination number have been determined for Fe 3 Si and Fe; these elucidate the nanocrystallization in two stages. The first stage revealed the formation of DO 3 nanocrystals and the second stage show evidence of a disordered Fe-rich interfacial region formed around the DO 3 nanograins. Thus the cumulant analysis of EXAFS is sensitive to the different crystalline fraction arising from annealing at various temperatures.