Effects of Fe Addition on the Phase Transformation Internal Friction in Ni-Al-Based Alloys

Abstract

The influences of chemical compositions on the internal friction of phase transformation were investigated for the quenched Ni-Al-based alloys. The internal friction measurements were completed using a low-frequency mechanical spectrum apparatus through forced vibration method. It was shown that the chemical compositions have the great influences on the internal friction of phase transition for the oil-cooled Ni-Al-based alloys. The peak-temperature of internal friction is lowered, and the peak-height is increased and the peak-width is narrowed when Fe content is elevated. The reducing of the peak-temperature is attributed to the increase of stability of γ phase due to the addition of Fe. The changes of the parameters of the peak are also related to the Aleq (equivalent Al) contents.

Effect of intercritical quenching soaking time on cryogenic toughness and internal friction characterization of 9Ni steel

“…The change curve of the internal friction shows that when the test steel experienced phase change, the internal friction decreased sharply and gradually compressed with the extension of holding time. The internal friction can be measured by the following expression using the original definition of internal friction [26]:…”