Study of non-linear effects related to the snoek-köster relaxation in Nb

Molinas, B.; Lambri, O.A.; Weller, Martin

doi:10.1016/0925-8388(94)90477-4

Cited by 24 publications

(38 citation statements)

References 6 publications

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“…On the other hand, the S values are zero for temperatures higher than MT temperature. The absence of ADD effects indicate that the dislocation movement is carried out without thermally activated break-away [18][19][20]22,28].…”

Section: Resultsmentioning

confidence: 99%

“…Subsequently the equation (2) was applied. This procedure allows to obtain damping as a function of the maximum strain (ε 0 ) from free decaying oscillations [20,22]. The strength of the ADD, can be determined through the average slope of the Q -1 (ε 0 ) curve using the S coefficient in equation (3) [20,22]:…”

Section: Methodsmentioning

confidence: 99%

“…In order to study the presence of non-linear effects in the microstructure, amplitude dependent damping (ADD), i.e. damping as a function of the maximum strain on the sample, ε 0 , was calculated from equation (2) [20,22]:…”

Section: Methodsmentioning

confidence: 99%

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Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

et al. 2018

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The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe 70 Pd 30 , it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformation temperature. In the present work, the influence of quenched-indefects upon the intensity and temperature of the thermoelastic martensitic (FCC-FCT) and the non thermoelastic (FCT-BCT) transitions in Fe-Pd doped with Co and Mn is studied. Differential scanning calorimetric and mechanical spectroscopy studies demonstrate that a reduction in the dislocation density the stability range of the FCC-FCT reversible transformation in Fe 67 Pd 30 Co 3 and Fe 66.8 Pd 30.7 Mn 2.5 ferromagnetic shape memory alloys.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

et al. 2018

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“…This procedure allows obtaining the damping as a function of the maximum strain (" 0 ) from free decaying oscillations. [17][18][19][20] The order of fitted polynomials was smaller than 3.…”

Section: Measurements 221 Mechanical Spectroscopymentioning

confidence: 99%

“…The tube working conditions were 40 kV and 20 mA. The 2 range was scanned between 20 and 80 with steps of 0.02 . The counting time was of 30 seconds by step.…”

Section: Samplesmentioning

confidence: 99%

Dislocation Movement in WE43 Magnesium Alloy during Recovery and Recrystallisation

Lambri

Garcı́a²,

Riehemann

et al. 2011

Mater. Trans.

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The mobility of dislocations has been investigated in WE43 magnesium alloy during recovery and recrystallisation for samples deformed plastically, at different degrees of plastic deformation and temperatures. The dislocation density decreases within the temperature range 550 K-650 K, in good agreement with the characteristic recovery temperature of this alloy, 630 K. New dislocations located at the grain boundaries start their movement from 650 K onwards. During recrystallisation, which has a characteristic temperature of around 700 K, the density of dislocations decreases and the possibility of movement of the dislocations also decreases, due to the development of internal stresses during the growth of new strain-free grains.The excess of vacancies promoted by the plastic deformation in cold worked samples is consumed up to temperatures of 550 K. New thermal vacancies which assist the movement of grain boundaries and dislocations are created after annealing at temperature above 650 K. Hot worked samples which exhibit dynamic recovery or recrystallisation, depending on the degree of plastic deformation; have a structure with both a scarce dislocations mobility and also a small dislocations density.

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Mechanical energy losses in commercial crosslinked low‐density polyethylene in the temperature range between 200 and 400 K

Lambri

Bonifacich

Garcı́a

et al. 2019

J of Applied Polymer Sci

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Aging treatments in water and in air and controlled neutron irradiation were performed on commercial crosslinked lowdensity polyethylene (XLPE) for promoting different mesostructural arrangements of crystallites and crosslinking degree. Infrared spectroscopy, differential scanning calorimetry, differential thermal analysis, thermogravimetry, and dynamic mechanical analysis were used as characterization techniques. The relaxation peak related to the mobility of the grain boundaries from crystalline zones in XLPE was identified at around 260 K (at 7 Hz), involving an activation energy of 90 AE 4 kJ mol −1 . The usual equation for describing the grain boundary mobility in metals involving the movement of grain boundary dislocations was adapted for studying the mobility of the boundaries among the crystalline zones, successfully. In addition, a new mechanical relaxation peak that appears at around 300 K (at 7 Hz), which involves an activation energy of 94 AE 5 kJ mol −1 , was found. The driving force controlling this peak was determined as the dragging of the polymer chains at the amorphous zones adjacent to the crystals controlled by the mobility of the crystallites boundaries. The chains movement was done with break away from the physical pinning points.

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Study of non-linear effects related to the snoek-köster relaxation in Nb

Cited by 24 publications

References 6 publications

Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

Dislocation Movement in WE43 Magnesium Alloy during Recovery and Recrystallisation

Mechanical energy losses in commercial crosslinked low‐density polyethylene in the temperature range between 200 and 400 K

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