Effects of heat-flux features on the differential scanning calorimetry curve of a thermoelastic martensitic transformation

Benke, Márton; Tranta, Ferenc; Barkóczy, Péter; Mertinger, Valéria; Daróczi, Lajos

doi:10.1016/j.msea.2007.01.184

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…Figure 6a and b is taken in cooling runs. The thermal effect was similar to those observed by previous authors [14,20]. Figure 6c shows the DSC curves of the R-phase transformation in cooling run and the reverse R-phase transformation in heating run.…”

Section: Resultssupporting

confidence: 86%

“…The inertia effect appeared symmetrically between heating and cooling runs. Such symmetric appearance of inertia effect was formerly reported in Cu-Al-Ni SMA [20]. The Ms and Mf * (or Rs and Rf * ) were determined by the tangent line method as illustrated in Fig.…”

Section: Resultssupporting

confidence: 63%

“…As these model curves are compared with those observed in this study and also those by previous authors [14][15][16]20], it is concluded that the model curve of type II is most appropriate for the present purpose. Both type I showing the k-type peak and type III showing peak with a plateau were seldom observed in experiments.…”

Section: ;supporting

confidence: 68%

“…The inertia effect is, however, still an unresolved problem. In fact, recently Benke et al [20,21] applied an empirical rule of excluding the inertia effect from the Mf measured with DSC. Eventually, they discarded the tangent line method [15,16], which has been used as the standard method of dealing with the data of DSC [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Avoiding error of determining the martensite finish temperature due to thermal inertia in differential scanning calorimetry: model and experiment of Ni–Ti and Cu–Al–Ni shape memory alloys

Kato

Sasaki

2011

J Mater Sci

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It is known that the thermal effect (thermal inertia) in differential scanning calorimetry causes significant error of measuring the martensite finish temperature (Mf) in shape memory alloy, while the start temperature (Ms) is virtually unaffected. This article shows that the error can be avoided by accounting for the thermal effect quantitatively by mathematical modeling, if the kinetics of the martensitic transformation is properly prescribed. In common with two representative shape memory alloys, Cu-Al-Ni and Ni-Ti alloys, exponential decay is appropriate for expressing the kinetics. The model analysis is extended to the two methods of extrapolation which aims at excluding the thermal effect from DSC data. One is the extrapolation of the cooling rate to zero, and the other is that of the mass of sample to zero. It is shown that both extrapolations construct a temperature between the Ms and Mf. Typically, the temperature is below the Ms by onethird of the interval between the two temperatures.

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Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 63%

Section: ;supporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Avoiding error of determining the martensite finish temperature due to thermal inertia in differential scanning calorimetry: model and experiment of Ni–Ti and Cu–Al–Ni shape memory alloys

Kato

Sasaki

2011

J Mater Sci

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“…We further assume that the two corresponding reverse transformations on heating occur in separate steps (first and second peaks on heating in Figure 1(a); start of formation of R-phase on heating: R SH , end of formation of R-phase on heating: R FH , start of back transformation to austenite: A S , and end of the back transformation to austenite: A F ). While there is still some discussion on how to exactly determine the start and end of martensitic transformations, [23,24] the abbreviations R S and M S are commonly used to address the beginning of the formation of the R-phase and B19¢. We use the abbreviations R SC and R SH to differentiate between the start of the R-phase formation during cooling (additional index C) and heating (additional index H).…”

Section: Introductionmentioning

confidence: 99%

On the Stress-Induced Formation of R-Phase in Ultra-Fine-Grained Ni-Rich NiTi Shape Memory Alloys

Olbricht

Yawny

Pelegrina

et al. 2011

Metall Mater Trans A

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Phase transformations in binary ultra-fine-grained (UFG) pseudoelastic NiTi wires were studied in a wide temperature range using mechanical loading/unloading experiments, resistance measurements, differential scanning calorimetry (DSC), thermal infrared imaging, and transmission electron microscopy (TEM). The formation of R-phase can be detected in the mechanical experiments. It is shown that the stress-strain response of the R-phase can be isolated from the overall stress-strain data. The R-phase always forms prior to B19¢ when good pseudoelastic properties are observed. The stress-induced B2 to R-phase transition occurs in a homogeneous manner, contrary to the localized character of the B2/R to B19¢ transformations. The temperature dependence of the critical stress values for the formation of the martensitic phases shows a Clausius Clapeyron type of behavior with constants close to 6 MPa/K (B19¢) and 18 MPa/K (R-phase). A stress-temperature map is suggested that summarizes the experimentally observed sequences of elementary transformation/deformation processes.

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Combustion characteristics and thermokinetics of coconut shell, coal water slurry, and biomass

Peng,

Tang,

Zeng

et al. 2024

Reac Kinet Mech Cat

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Effects of heat-flux features on the differential scanning calorimetry curve of a thermoelastic martensitic transformation

Cited by 15 publications

References 5 publications

Avoiding error of determining the martensite finish temperature due to thermal inertia in differential scanning calorimetry: model and experiment of Ni–Ti and Cu–Al–Ni shape memory alloys

Avoiding error of determining the martensite finish temperature due to thermal inertia in differential scanning calorimetry: model and experiment of Ni–Ti and Cu–Al–Ni shape memory alloys

On the Stress-Induced Formation of R-Phase in Ultra-Fine-Grained Ni-Rich NiTi Shape Memory Alloys

Combustion characteristics and thermokinetics of coconut shell, coal water slurry, and biomass

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