Internal friction in (Fe80Ga20)99.95(NbC)0.05 alloy at elevated temperatures
作者： Meiling Fang , Jie Zhu , Igor S. Golovin , Jiheng Li , Chao Yuan
DOI: 10.1016/J.INTERMET.2012.05.015
关键词: Crystallography 、 Materials science 、 Torsion pendulum clock 、 Activation energy 、 Analytical chemistry 、 Atmospheric temperature range 、 Solid solution 、 Quenching 、 Relaxation (NMR) 、 Annealing (metallurgy) 、 Grain boundary
摘要: Abstract The temperature and frequency dependent internal friction of a rolled (Fe 80 Ga 20 ) 99.95 (NbC) 0.05 alloy has been investigated using computer-controlled automatic inverted torsion pendulum instruments. measurements were carried out in forced vibration mode from room up to 973 K with varying between 0.5 Hz 11 Hz. Results obtained by standard methods XRD, SEM DSC show that the main phases specimen structure is disorder A2 phase (random solid solution) NbC phase. Two peaks are observed range 973 K. low-temperature peak at about 423 K occurs only high quenching may be complex effect consisting Snoek-type relaxation vacancies/ordering effect. A pronounced thermally activated (P1) 750 K all samples activation energy 2.21–2.84 eV time 1.71 × 10 −20 –8.79 × 10 −17 s classified as Zener peak. damping background above P1 caused interaction precipitates solution particles temperature. (P2) 873 K water quenched below 1173 K. P2 disappears if 1373 K. height strongly on annealing decreases quickly increasing According energy, most probably originating grain boundary relaxation. In particular, boundaries lead
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