The Influences of Aging on the Two Relaxation Peaks in the Air-Cooled Fe71Al29 Alloy

Abstract:

Binary Fe-Al alloy ingots with 29 at. %Al were prepared with commercially pure Fe and Al in a vacuum induction furnace. The specimens used in the internal friction measurement were cut using an electric sparkle machine from the ingots into a dimension 68×1.7×0.9 mm3. The heat treatment was performed in such regimes as heating temperature 900°C and holding time 1 hour in an argon atmosphere followed by furnace cooling or air cooling. The air-cooled samples were then aged at 350°C for different time to achieve the different degree of disorder. The internal fiction-temperature spectra of the air-cooled Fe₇₁Al₂₉ alloy were measured during both heating and cooling using a computer-controlled automatic inverted torsion pendulum through free-decay and forced vibration methods. It has been found that three internal friction peaks appear during heating at 180°C termed as P1, 340°C termed as P2 and 510°C termed as P3 in air-cooled specimens, respectively. P1 and P2 peaks disappear and P3 is retained during cooling. XRD results show that the air-cooled Fe₇₁Al₂₉ alloy is disordered and the furnace-cooled specimen possesses ordered structures. The air-cooled specimen presents similar diffraction peaks to the furnace-cooled specimen after it is heated to 650°C and then in-situ cooled to room temperature. Ageing has great influence on the P1 and P2 peaks for the air-cooled Fe₇₁Al₂₉ alloy. The height of P1 and P2 peaks is decreased with increasing aging time, which is due to the reduction in the disorder degree of the air-cooled specimen.

• Periodical: Applied Mechanics and Materials (Volumes 80-81)
• Pages: 457-463
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.80-81.457
• Online since: July 2011
• Authors: S.Y. Gu, Z. C. Zhou, Y.J. Yan, H. Yang, Jie Du
• Keywords: Aging, Air-Cooled Fe71Al29 Alloy, Internal Friction

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