Internal friction at first-order phase transitions in solids

Postnikov, V. S.; Гриднев, С. А.; Darinskii, B. M.; Sharshakov, I. M.

doi:10.1007/bf02722500

Cited by 55 publications

(11 citation statements)

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“…3 and 5, it can be also concluded that the high-temperature IF peak is a nonlinear function of _ T T=f, and does not agree with Delorme's model [19]. Several investigators have already reported such nonlinear relations [20,21]. According to the model of phase interface [22], in the foamed Zn-Al eutectoid alloy, the IF of phase transition is defined as…”

Section: High-temperature If Peakmentioning

confidence: 99%

Damping Behavior and Mechanism of Foamed Zn-Al Eutectoid Alloy

Wei

Han

2002

phys. stat. sol. (a)

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Subject classification: 62.40.+iThe present work investigates the damping behavior and mechanisms in foamed Zn-Al eutectoid alloy prepared by air pressure infiltration process. Pores in the foamed Zn-Al eutectoid alloy have macroscopic size of the order of a millimeter (0.5-1.0 mm) and in large proportions, typically up to 65 vol%. The damping behavior of the foamed Zn-Al eutectoid alloy is characterized by internal friction (IF). IF and relative dynamic modulus measurements at maximum surface shear strain of 20 Â 10 --6 have been made using a multifunction internal friction apparatus (MFIFA) at three discrete frequencies of 0.5, 1.0, and 3.0 Hz over a temperature range from room temperature to 400 C, while continuously changing temperature. Two IF peaks were found in the IF-temperature curves. The first is a grain boundary IF peak, which is associated with the diffusive flux on a crystalline boundary of Al. Its activation energy has been calculated to be (1.12 AE 0.04) eV and the pre-exponential factor t 0 is 10 --14 s in IF measurements. The second is a phase transition peak, which results from the transformation of Zn-Al eutectoid. Experimental results show that this phase transition IF peak is a function of _ T T=f ( _ T T rate of temperature change, f vibration frequency), but is not proportional to _ T T=f . Finally, the damping capacity of the foamed Zn-Al eutectoid alloy, with different macroscopic pore volume fractions and two different macroscopic pore sizes, were compared with that of bulk Zn-Al eutectoid alloy specimens. The damping capacity of the materials is shown to increase with increasing volume fraction of macroscopic pores and increase with decreasing macroscopic pore size. The operative possible damping mechanisms in the foamed Zn-Al eutectoid alloy were discussed in light of IF measurements.

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Section: High-temperature If Peakmentioning

confidence: 99%

Damping Behavior and Mechanism of Foamed Zn-Al Eutectoid Alloy

Wei

Han

2002

phys. stat. sol. (a)

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“…The heights of both peaks are reciprocally proportional to the vibration frequency. This is the feature of mechanical loss due to phase transition [8]. The peak located at 188°C corresponds to the ferro-paraelectric phase transition.…”

Section: Specimens and Experimental Proceduresmentioning

confidence: 95%

97/04986 Mechanical loss and elastic modulus associated with phase transitions in PLZT ceramics

1997

Fuel and Energy Abstracts

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The phase transition in lanthanum modified lead zirconate-titanate ceramic of 6/60/40 is studied by mechanical loss Q-I and elastic modulus measurements. The shear elastic modulus measured from 50°C to 250°C shows that the Curie temperature is located at 180°C for the transition from cubic to rhombohedral phase. The Q-' curves at low frequencies show clearly a peak corresponding to such phase transition. This phase transition is c o n f m e d by measurements of Young's modulus and Q-I using resonance curve technique from-100°C to 300°C at kilohertz. Moreover, between 50°C and 90°C, the resonance curve recorded at kHz frequency shows two resonance peaks. Such existence of double peaks means that a phase transition takes place between two rhombohedral phases FE2 and FEl in the fenpelectric state. These phase transitions are also studied by DSC measurement.

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“…Further the transition exhibits a broad peak with a kink which may be attributed to the relaxor ferroelectric nature of the ceramic or an improper ferroelastic transition mostly observed in barium based ceramics. According to Postnikov et al [19] fluctuating model of low frequency internal friction, at the phase transition interface it is assumed that thermally activated new nuclei will appear and grow by pinning the phase transition interface boundary. In addition it should be noticed that a maximum lattice strain is observed in the BCT-BST synthesized by molten salt technique (Table. 1).…”

Section: Elastic and Anelastic Behaviour Of Bct-bstmentioning

confidence: 99%

Elastic and Anelastic Behavior of Microwave Sintered BCT-BST Ceramics

Madhuri¹,

Pavithra²,

Kiran³

et al. 2019

IJEAT

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Lead free 0.55(Ba0.9Ca0.1) TiO3-0.45Ba (Sn0.2Ti0.8) O3 (BCT-BST) ceramic is synthesized by three different techniques viz solid state method, sol-gel method and molten-salt method. The prepared BCT-BST ceramic samples exhibited cubic crystal structure on X-ray powder diffraction analysis. The morphology of the samples is analyzed using transmission electron microscope. The lattice interactions with ultrasonic waves and morphotropic phase boundary at 70oC is confirmed from elastic and anelastic studies of the ceramic. High piezoelectric coefficient d33 of 623 pC/N is achieved in the prepared BCT-BST ceramics.

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Internal friction at first-order phase transitions in solids

Cited by 55 publications

References 1 publication

Damping Behavior and Mechanism of Foamed Zn-Al Eutectoid Alloy

Damping Behavior and Mechanism of Foamed Zn-Al Eutectoid Alloy

97/04986 Mechanical loss and elastic modulus associated with phase transitions in PLZT ceramics

Elastic and Anelastic Behavior of Microwave Sintered BCT-BST Ceramics

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