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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/155764
- Phase transformation in oil-quenched Ni–21.2Al–20Fe alloy
- Zhou, Z. C.; Gua, S. Y.; Wen, C. E.
- The internal friction (Q−1) and the relative dynamic modulus (RDM) of the oil-quenched Ni–21.2Al–20Fe alloy were measured using a multifunctional internal friction apparatus by forced-vibration methods from room temperature to 200 °C. An internal friction peak is represented on the internal friction-temperature curve at about 113 °C during heating and the peak is shifted to about 38 °C during cooling for the oil-quenched alloy. The peak temperature does not change for different vibration frequencies during both heating and cooling, and therefore the peak is non-relaxational. It has been shown that the peak-heights decrease with increasing f and decreasing heating rate View the MathML source and are linearly and directly proportional to View the MathML source. DSC measurements show that there is an endothermal peak at 107 °C and an exothermal peak at 42 °C on the heating curve and cooling curve, respectively. Both temperature values are similar to those of the internal friction measurements during heating and cooling, respectively. XRD results show that the oil-quenched Ni–21.2Al–20Fe alloy possesses martensitic structures (L10) in addition to Ni3Al and Ni5Al3. It can be deduced that the internal friction peak during heating is resulted from reverse martensitic transformation of L10 → γ and originated from martensitic transformation of γ → L10 during subsequent cooling. The internal friction peak height increases when Fe content is raised.
- Publication type
- Journal article
- Journal of Alloys and Compounds, Vol. 509, no. 5 (Feb 2011), pp. 1644-1647
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- Copyright © 2010 Elsevier B.V. All rights reserved.