Anelasticity correlated to vacancies in B2 Fe-Al alloys

✍ Scribed by Wu, J. ;Han, F. S. ;Gao, Z. Y. ;Hao, G. L. ;Wang, Q. Z.

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 357 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521404

✦ Synopsis

Abstract

Internal friction behaviors of B2 Fe–Al alloys were examined to understand the correlation between the anelasticity and thermal vacancies. Three internal friction peaks were found in the rapidly cooled specimens at around 210 °C (P1), 410 °C (P2) and 520 °C (P3), respectively, while in the slowly cooled specimens, the P1 peak was significantly decreased and the P2 peak was decomposed into two peaks (P2~L~ and P2~H~). All the internal friction peaks showed relaxational nature and they shifted toward high temperature with increasing frequency. It is suggested that the P1 peak originates from the reorientation of the divacancies composed of Fe vacancies and the nearest‐neighboring Al vacancies, the P2~L~ peak from the dissociation and diffusion of the interstitial carbon atoms from the carbon‐vacancy complexes and the P2~H~ peak from the reorientation of the triple defects. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)