Spectroscopic and Mechanical Studies on the Fe–based Amorphous Alloy 2605SA1
Agustín Cabral–Prieto,1* Juan Antonio Contreras–Vite,2a Irma García–Sosa,1 Noel Nava,3 and Federico García–Santibáñez2b
1 Instituto Nacional de Investigaciones Nucleares, Departamento de Química, Carretera México–Toluca S/N. La Marquesa, Ocoyoacac. C.P. 52750, México. Phone: (+) 53297200. FAX: (+) 53297301. *Responsible author: agustin.cabral@inin.gob.mx.
2 Facultad de Ciencias, Universidad Autónoma del Estado de México. El Cerrillo Piedras Blancas, Toluca, Edo. de México, atony_jv@hotmail.com, bfegasa@uaemex.mx.
3 Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas, 152, Col. San Bartolo Atepehuacan, Gustavo A. Madero, C.P. 07730 México D. F. tnava@im.mx.
]]> Received November 10, 2009
Abstract
The Vickers micro–hardness of this alloy was unusually dependent on the heat treatment from 300 to 634K, inferring important micro–structural changes and the presence of amorphous grains before its phase transition. Once the alloy is crystallized, the micro–hardness is characteristic of a brittle alloy, the main problem of these alloys. Within the amorphous state, other properties like free–volume, magnetic states and Fe–Fe distances were followed by PALS and MS, respectively, to analyze those micro–structural changes, thermally induced, which are of paramount interest to understand their brittleness problem.
Keywords: Amorphous alloys, Mössbauer spectroscopy, annihilation of positrons, free–volume, defects, micro hardness, brittleness.
Resumen
La microdureza Vickers de esta aleación presentó una tendencia inusual entre 300 y 634 K, a partir de lo cual se infieren cambios micro–extructurales importantes y la presencia de granos amorfos antes de ocurrir su transformación de fase. Una vez cristalizada la aleación, la microdureza es característica de una aleación fragilizada, el principal problema de estas aleaciones. Dentro de su estado amorfo, fueron estudiadas otras propiedades como volumen–libre, estados magnéticos y las distancias Fe–Fe con PALS y MS, respectivamente, para analizar esos cambios micro–estructurales, inducidos térmicamente, lo cual es del mayor interés para entender su problema de fragilidad.
Palabras claves: Aleaciones amorfas, espectroscopía Mössbauer, aniquilación de positrones, volumen libre, defectos, micro dureza, fragilidad.
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Acknowledgements
We are grateful to J. Jordan and Dr. R. Hasegawa from Metglass Inc. Co. in the USA for providing us with the 2605SA1 alloy sample.
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