Effect of heating rate and grain size on the melting behavior of the alloy Nb–47 mass% Ti in pulse-heating experiments

Basak, D; Boettinger, William J.; Josell, Daniel; Coriell, S. R.; McClure, J. L.; Krishnan, Sitaraman; Cezairliyan, A.

doi:10.1016/s1359-6454(99)00191-3

Cited by 31 publications

(19 citation statements)

References 17 publications

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“…The melting temperature measured at the highest heating rates (negligible interdiffusion) is approximately 10 K higher than the value of 1945 K obtained in this laboratory using pure Ti specimens. Note that, for monolithic materials of this type the steady-state difference in temperature between the center and surface of a 1.58 mm radius Mo rod due to radiative losses from the surface is only approximately 3 K. 4 Other values from the literature are between 1941 and 1943 K. That the experimental value is higher than the accepted value might be indicative of oxygen or nitrogen in the films. For the materials of interest for study by this technique, an uncertainty of this size is acceptable.…”

Section: A Pure Titanium Coatingsmentioning

confidence: 90%

“…The temperature at which the spectral emissivity exhibited a discontinuous decrease was taken as smoothing of the surface caused by melting. 4 Data from 21 experiments are summarized in Fig. 1.…”

Section: A Pure Titanium Coatingsmentioning

confidence: 99%

“…The difference in operating wavelengths for the two measurements leads to an error of less than 1 K for a Ti53Nb47 alloy. 4 The plateau in the true temperature is associated with the enthalpy of melting for the alloy. predict behavior that ranges from a monotonic decrease with Al content [10][11][12] to a congruent maximum.…”

Section: Figmentioning

confidence: 99%

“…For constant input power, a prediction of the time required to fully melt the specimen is obtained by dividing the latent heat by the specific heat and heating rate prior to the plateau. 4 For Cr this is approximately 350 K divided by the heating rate which gives 35 ms at a heating rate of 1 × 10…”

Section: Cr Wires (Low Oxygen) Coated With W/momentioning

confidence: 99%

“…Such a technique permitted a study of the impact of heating rate and grain size on the melting behavior exhibited by a Nb-47 mass% Ti alloy. 4 The savings do come with other "costs", specifically loss of accuracy in temperature determination caused by inclusion of an additional real-time measurement (spectral emissivity). However, the accuracy is still significantly higher than that of other experimental techniques, e.g., visual observation of melting.…”

Section: Introductionmentioning

confidence: 99%

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Moving the pulsed heating technique beyond monolithic specimens: Experiments with coated wires

Josell¹,

Basak²,

McClure³

et al. 2001

J. Mater. Res.

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Pulsed heating experiments that measure high-temperature thermophysical properties using pyrometric measurement of the temperature-time history of metal specimens rapidly heated by passage of electric current have a 30-year history at the National Institute of Standards and Technology. In recent years, efforts have been made to move beyond the limitations of the standard technique of using costly, black-body geometry specimens. Specifically, simultaneous polarimetry measurement of the spectral emissivity has permitted study of sheet and wire specimens. This paper presents the results of two efforts to expand beyond the macroscopically monolithic, single-phase materials of all previous studies. In the first study the melting temperatures of coatings, including Ti and Ti(Al) alloys, deposited on higher melting Mo substrates are measured. In the second study the melting temperatures of substrates, Ti and Cr, covered by higher melting W and Mo coatings are measured.

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Section: A Pure Titanium Coatingsmentioning

confidence: 90%

Section: A Pure Titanium Coatingsmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Section: Cr Wires (Low Oxygen) Coated With W/momentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Moving the pulsed heating technique beyond monolithic specimens: Experiments with coated wires

Josell¹,

Basak²,

McClure³

et al. 2001

J. Mater. Res.

Self Cite

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An experimental investigation on the kinetics of solute driven remelting

Dutta

Rettenmayr

2000

Metall Mater Trans A

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Thermophysical Properties of Solid and Liquid Ti-6Al-4V (TA6V) Alloy

et al. 2006

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Ti-6Al-4V (TA6V) titanium alloy is widely used in industrial applications such as aeronautic and aerospace due to its good mechanical properties at high temperatures. Experiments on two different resistive pulse heating devices (CEA Valduc and TU-Graz) have been carried out in order to study thermophysical properties (such as electrical resistivity, volume expansion, heat of fusion, heat capacity, normal spectral emissivity, thermal diffusivity, and thermal conductivity) of both solid and liquid Ti-6Al-4V. Fast timeresolved measurements of current, voltage, and surface radiation and shadowgraphs of the volume have been undertaken. At TU-Graz, a fast laser polarimeter has been used for determining the emissivity of liquid Ti-6Al-4V at 684.5 nm and a differential scanning calorimeter (DSC) for measuring the heat capacity of solid Ti-6Al-4V. This study deals with the specific behavior of the different solid phase transitions (effect of heating rate) and the melting region, and emphasizes the liquid state (T >2000 K).

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Effect of heating rate and grain size on the melting behavior of the alloy Nb–47 mass% Ti in pulse-heating experiments

Cited by 31 publications

References 17 publications

Moving the pulsed heating technique beyond monolithic specimens: Experiments with coated wires

Moving the pulsed heating technique beyond monolithic specimens: Experiments with coated wires

An experimental investigation on the kinetics of solute driven remelting

Thermophysical Properties of Solid and Liquid Ti-6Al-4V (TA6V) Alloy

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