Temperature-rate dependent kinetics of martensitic transformation in MnCu alloy

Liu, Junmin; Zhang, J.X.

doi:10.1016/0038-1098(96)00046-4

Cited by 16 publications

(8 citation statements)

References 13 publications

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“…For example, while the latent heat is generally considered a material constant, thermally-induced hysteretic martensitic transformations are also thought to experience an increase in latent heat with the increasing scanning rate due to the irreversible motion of phase interface. [7][8][9] Similarly, a small dependence of the latent heat of freezing of water on the supersaturation temperature has also been reported. 10 It is usually very difficult to unambiguously draw such inferences because the area of the latent heat peak in the DTA measurement itself varies strongly (approximately with a linear dependence) with the temperature scanning rate.…”

Section: Introductionmentioning

confidence: 86%

Absolute calibration of the latent heat of transition using differential thermal analysis

Bar,

Bansal

2021

Preprint

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We describe a simple and accurate differential thermal analysis set up to measure the latent heat of solid state materials undergoing abrupt phase transitions in the temperature range from 77 K to above room temperature. We report a numerical technique for the absolute calibration of the latent heat of the transition, without the need of a reference sample. The technique is applied to three different samples-vanadium sesquioxide undergoing the Mott transition, bismuth barium ruthenate undergoing a magnetoelastic transition, and an intermetallic Heusler compound. In each case, the inferred latent heat value agrees with the literature value to within its error margins. To further demonstrate the importance of absolute calibration, we show that the changes in the latent heat of the Mott transition in vanadium sesquioxide (V 2 O 3 ) stays constant to within 2% even as the depth of supersaturation changes by about 10 K, in non-equilibrium dynamic hysteresis measurements. We also apply this technique for the measurement of the temperature-dependent specific heat.

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Section: Introductionmentioning

confidence: 86%

Absolute calibration of the latent heat of transition using differential thermal analysis

Bar,

Bansal

2021

Preprint

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“…The well-known high damping Mn-Cu alloys show also a shape memory effect; it is characteristic of the FCC-FCT martensitic transformation, closely related to the paramagneticantiferromagnetic transition [27]. The high relaxation peak in the martensitic state of Mn-Cu alloy was extensively studied in the past years, based on the reversible movement assumption of the {101} transformation twin boundaries [8,28,29].…”

Section: Mn-cu Alloymentioning

confidence: 99%

On the Internal Friction Due to the Twin Boundary-H Interaction in Martensite

Fan

Zhou

Otsuka

et al. 2013

Icomat

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The development of high damping materials is important in the modern world, in order to suppress noises and to avoid vibrations in automobiles etc. In such development researchers are paying keen attention to the use of the relaxation type internal friction peak in martensite, because the peak is stable at constant temperature. Such a relaxation type peak was first found in Ti-Nibased alloys in 1960's, and was interpreted in various ways in the past, such as dislocation relaxation, dislocation-point defect relaxation or hydrogen relaxation, etc. Recently we proved by critical experiments in Ti 50 Ni 50-x Cu x alloys that both twin boundaries and hydrogen are indispensable for the appearance of the relaxation peak. In order to check the generality of the result, other shape memory alloys such as Ti-Ni-Fe, Ti-Ni-Pd, Ti-Pd, Mn-Cu, Au-Cd, Cu-Al-Ni etc. were investigated from this viewpoint by using DMA. As a result, the relaxation peak was observed in most of the alloys, except for Cu-Al-Ni alloy. By assessing the previous mechanisms proposed, we will discuss the possible mechanism for the relaxation peak in martensite. Based on these investigations, a guideline for obtaining high damping materials is also suggested.

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“…A general power law has been used to establish the relationship between cooling rates and transition temperatures as well as between cooling rates and enthalpy. This is based on what has been reported in many articles such as [37,[66][67][68][69]. After the relationship has been developed, calculations were made to get information at extremely high cooling rates and compared with available experimental data.…”

Section: Analytical Model For Extrapolation To Higher Cooling Ratementioning

confidence: 99%

Solidification Behavior of Commercial Magnesium Alloys

Han¹,

Kenik²,

Agnew³

et al. 2001

Magnesium Technology 2001

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In this thesis, the solidification behavior of AZ91D, AM60B and AE44 commercial magnesium alloys has been studied experimentally by differential scanning calorimeter (DSC) and optical microscopy. The effect of different cooling rates on the transition temperatures and microstructures were analyzed. It was found that the effect of cooling rate on the solidus temperature is more significant than on the liquidus. The solidus temperature decreases clearly with increasing cooling rates, but for the liquidus temperature there is slightly increasing trend.The latent heat of solidification was also calculated and found that it increases when the cooling rate increases. Thermodynamic calculations were made using FactSage along with VLGM database and were compared with the experimental findings as well as with the literature data.Thermodynamic calculations were also utilized to understand the microstructures as well as the phase distribution. The microstructural details of as-cast and post-DSC samples have also been investigated using optical microscope. Finally, a relationship between cooling rate and transition temperature and solidification enthalpy has been established based on the general power law. Using this relationship it is possible to predict the transition temperatures and solidification enthalpies of these alloys at high cooling rates.

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Temperature-rate dependent kinetics of martensitic transformation in MnCu alloy

Cited by 16 publications

References 13 publications

Absolute calibration of the latent heat of transition using differential thermal analysis

Absolute calibration of the latent heat of transition using differential thermal analysis

On the Internal Friction Due to the Twin Boundary-H Interaction in Martensite

Solidification Behavior of Commercial Magnesium Alloys

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