High-temperature relaxation analysis in a fine-grain B2 FeAl intermetallic

Simas, P.; Juan, J. San; Nó, M.L.

doi:10.1016/j.intermet.2010.01.005

Cited by 13 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Weller et al [15] and recently applied to intermetallic compounds [16][17]. A linear dependence of lnQ -1 versus lnω for each temperature is clearly observed in the HTB (Fig.…”

Section: Experimental Results and Analysismentioning

confidence: 86%

High temperature internal friction measurements of 3YTZP zirconia polycrystals. High temperature background and creep

Simas

Castillo-Rodríguez

Nó

et al. 2014

Journal of the European Ceramic Society

Self Cite

View full text Add to dashboard Cite

This work focuses on the high-temperature mechanic properties of a 3 mol % yttria zirconia polycrystals (3YTZP), fabricated by hot-pressureless sintering.Systematic measurements of mechanical loss as a function of temperature and frequency were performed. An analytical method, based on the generalised Maxwell rheological model, has been used to analyse the high temperature internal friction background (HTB). This method has been previously applied to intermetallic compounds but never to ceramics, except in a preliminary study performed on fine grain and nano-crystalline zirconia. The HTB increases exponentially and its analysis provides an apparent activation enthalpy which correlates well with that obtained from creep experiments. This fact shows on the one hand the plausibility of applying the generalised Maxwell model to ceramics, and on the other hand indicates the possibility of using mechanical spectroscopy as a complementary helpful technique to investigate the high temperature deformation mechanism of materials.

show abstract

“…Weller et al [15] and recently applied to intermetallic compounds [16][17]. A linear dependence of lnQ -1 versus lnω for each temperature is clearly observed in the HTB (Fig.…”

Section: Experimental Results and Analysismentioning

confidence: 86%

High temperature internal friction measurements of 3YTZP zirconia polycrystals. High temperature background and creep

Simas

Castillo-Rodríguez

Nó

et al. 2014

Journal of the European Ceramic Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…The importance of the IFB (also called as high temperature background (HTB)) have two aspects. On one hand, it could provide information about microscopic mechanisms involved in high-temperature creep behavior, 20) and on the other hand, because once the HTB is characterized, it is possible to remove it from the internal friction spectra, and then the internal friction peak can be better analyzed. 10) Figure 6 shows the net peak after being subtracted IFB for the water quenched Ti5Mo alloy at f = 1 Hz.…”

Section: The Internal Friction Of the Timo Alloysmentioning

confidence: 99%

The Atomic Defect Relaxation Processes in the Ti–Mo Alloys

Zheng

Yang

et al. 2020

Mater. Trans.

View full text Add to dashboard Cite

The relaxation processes correlated to atomic defects were investigated by the internal friction method using a multifunctional internal friction apparatus for TiMo alloys. The microstructures of the TiMo alloys with different Mo content and heat treatments were observed using an optic microscopy and a scanning electronic microscopy. Their phase constitutions were detected by X-ray diffraction (XRD). The ¢ phase increases and ¡ phase decreases in volume with increasing Mo content for the furnace-cooled alloys. Similarly, the ¢ M phase volume increases when Mo content is increased. The two relaxational internal friction peaks, named as P1 for the low temperature peak and P2 for the high temperature peak, respectively, are found on the internal friction temperature dependent curves in the alloys. The two peaks always appear in the present experimental specimens with different Mo content and different heat treatments except for the water quenched Ti24 Mo alloys. The P1 and P2 peaks are all influenced by Mo content and heat treatments and related to phase constitutions and microstructures. The P1 peak height increases with increasing Mo content for the water quenched alloys and the P1 peak temperature is not changed with Mo content. The P2 peak height increases also with increasing Mo content and the P2 peak temperature is raised when Mo content is increased but for the water quenched Ti3Mo and Ti5Mo alloys. Relaxation parameters of P1 peak are H wq1 = 1.56 « 0.1 eV and¸0 wq1 = 2.5 © 10 ¹16«0.1 s and those of P2 peak are H wq2 = 2.3 « 0.1 eV and¸0 wq2 = 2.1 © 10 ¹17«0.1 s for the water-quenched Ti5Mo alloy, respectively. The P1 peak is attributed to the stressinduced short-range ordering of oxygen complexes around Ti atoms in the TiMo alloys. The increase of the P1 peak height with increasing Mo content is attributed to the increase of ¢ phase in volume. The P2 peak is resulted from the interaction of MoO atoms or the reorientation of MoMo atomic pairs by means of vacancies. The MoO interaction is strengthened when Mo content is increased, which results in the increase of both the peak temperature and the activation energy of the P2 peak.

show abstract

“…Khachaturyan [21,37,38]. The Bain strain is required for the diffusionless part of cubic to tetragonal displacive transformation that brings the structure closer to an equilibrium fcc-based At least three relaxation processes were reported in Fe-based alloys in similar temperaturefrequency range with the P2 peak: Zener relaxation due to reorientation of substitute atoms, grain boundary relaxation due to elastic sliding of grain boundaries and medium temperature dislocation effects [41]. Activation parameters of the P2 peak and, in particular the  0 term, are not consistent with a dislocation dominated relaxation process.…”

Section: Experimental Techniquementioning

confidence: 99%

Influence of composition and heat treatment on damping and magnetostrictive properties of Fe–18%(Ga + Al) alloys

Golovin¹,

Palacheva²,

Zadorozhnyy³

et al. 2014

Acta Materialia

View full text Add to dashboard Cite

Structure, magnetostriction and damping properties are analyzed in Fe 82 Ga (18-x) Al x (x = 0, 5, 8, 12) alloys. Anelastic response of Fe-18(Ga+Al) alloys is studied as a function of temperature (from 0 to 600°C), frequency (from 0.01 to 200 Hz) and amplitude (from 0.0004% to 0.2%) of forced vibrations. The origin of the relatively high damping capacity of Fe-Ga-Al alloy at room temperature is checked by applying magnetic field and different heat treatment regimes. Substitution of Ga by Al in Fe-18%Ga alloys decreases magnetostriction and damping. Heat treatment of alloys influences the damping capacity of alloys more than variations of their chemical compositions. Thermally activated frequency and temperature dependent anelastic effects in Fe-Ga-Al alloys are analyzed and corresponding activation parameters for relaxation processes are evaluated. Internal friction effects caused by structural transformations are recorded and are consistent with the A2 → D0 3 → L1 2 reaction. Physical mechanisms for all anelastic effects are discussed.

show abstract

High-temperature relaxation analysis in a fine-grain B2 FeAl intermetallic

Cited by 13 publications

References 30 publications

High temperature internal friction measurements of 3YTZP zirconia polycrystals. High temperature background and creep

High temperature internal friction measurements of 3YTZP zirconia polycrystals. High temperature background and creep

The Atomic Defect Relaxation Processes in the Ti–Mo Alloys

Influence of composition and heat treatment on damping and magnetostrictive properties of Fe–18%(Ga + Al) alloys

Contact Info

Product

Resources

About