Mechanical loss spectrum of Ni3(Al,Ta) single crystals

Mourisco, Aroldo; Baluc, N.; Bonneville, J.; Schaller, R.

doi:10.1016/s0921-5093(97)00594-7

Cited by 14 publications

(13 citation statements)

References 5 publications

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“…A peak with H and 0 close to those of peak 1 [2] has been observed by other investigators [1,3,4] who have given alternative interpretations. The peak was attributed by Gadaud et al [1] to Ni diffusion whereas Mourisco et al [3,4] considered it as a Zener peak.…”

Section: Introductionsupporting

confidence: 78%

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Single crystal PWA 1483 superalloy: Dislocation rearrangement and damping phenomena

Deodati

Montanari

Tassa

et al. 2009

Materials Science and Engineering: A

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a b s t r a c tThe structural stability of the single-crystal PWA 1483 superalloy has been investigated by internal friction (IF) and dynamic modulus measurements from room temperature to 1073 K. The examined samples were in the solubilized state.The vibrating reed technique with electrostatic excitation and frequency modulation detection of flexural vibrations has been employed. Frequency was ∼350 Hz.IF spectra recorded in successive test runs on the same samples show a Q −1 maximum (M1) above 623 K, whose intensity and position change from one run to another; in correspondence with M1 the modulus undergoes a slow decrease followed by a sudden increase. Sometimes another maximum (M2) has been observed at lower temperature (∼523 K).After each run the values of the modulus and of Q −1 change indicating that a progressive irreversible transformation occurs. Damping phenomena have been attributed to the rearrangement of dislocation structures in the disordered matrix. This rearrangement modifies the density and the average distance of pinning points. This explanation is supported by transmission electron microscopy (TEM) observations.

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Section: Introductionsupporting

confidence: 78%

“…The peak was attributed by Gadaud et al [1] to Ni diffusion whereas Mourisco et al [3,4] considered it as a Zener peak.…”

Section: Introductionmentioning

confidence: 99%

Single crystal PWA 1483 superalloy: Dislocation rearrangement and damping phenomena

Deodati

Montanari

Tassa

et al. 2009

Materials Science and Engineering: A

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“…Since the observed relaxation effect is very similar in character to that reported for Ni 3 Al [2,7,8], it seems most reasonable to interpret it as of the same origin: stress-induced reorientation of Ga in the Ni sublattice (or the ␣ sublattice). The particular features supporting this interpretation involve the magnitudes of the activation parameters and the dependence of the relaxation strength on the Ga content, which are shown in Fig.…”

Section: Origin Of the Relaxationsupporting

confidence: 74%

Application of mechanical spectroscopy to studies of atomic diffusion in ordered compounds

Numakura¹,

Nishi²

2009

Materials Science and Engineering: A

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“…Mourisco et al [3,4] reported a similar relaxation peak in Ni 3 Al containing a small amount of Ta (Ni 75 Al 24 Ta 1 ). The latter is believed to be the same effect as the former, i.e., it is not due to Ta solutes but intrinsic defects, from the close similarities between the two.…”

Section: Relaxation Effect In Ni 3 Almentioning

confidence: 81%

“…Ni 3 Al, an intermetallic compound with the L1 2 ordered structure, exhibits a well-defined anelastic relaxation effect [1][2][3][4], which can be interpreted to be due to stress-induced reorientation of antisite Al atoms in the Ni sublattice [5]. In this paper we first review earlier observations and the proposed mechanism.…”

Section: Introductionmentioning

confidence: 99%

Probing diffusional jumps in ordered compounds by anelastic relaxation spectroscopy

Numakura¹

2005

Mat.-wiss. u. Werkstofftech.

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Intrinsic point defects may give rise to anelastic relaxation effects in ordered compounds in which some of the sublattice sites have lower symmetry than the host lattice. Detailed experiments have been carried out on one of such effects: the relaxation effect in Ni 3 Al, which was interpreted to be due to stress-induced reorientation of antisite Al atoms in the Ni-sublattice (Numakura et al. 1999), focussing on the effects of deviation of composition from stoichiometry. The relaxation strength has been found to increase sensitively with increasing Al concentration, supporting firmly the earlier interpretation. The observed relaxation rates have been analysed on the basis of the mechanism of atomic diffusion

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Mechanical loss spectrum of Ni3(Al,Ta) single crystals

Cited by 14 publications

References 5 publications

Single crystal PWA 1483 superalloy: Dislocation rearrangement and damping phenomena

Single crystal PWA 1483 superalloy: Dislocation rearrangement and damping phenomena

Application of mechanical spectroscopy to studies of atomic diffusion in ordered compounds

Probing diffusional jumps in ordered compounds by anelastic relaxation spectroscopy

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