Effect of heating and cooling rate on the kinetics of allotropic phase changes in uranium: A differential scanning calorimetry study

Kumar, Arun; Raju, S.; Jeyaganesh, B.; Mohandas, E.; Sudha, R.; Ganesan, V.

doi:10.1016/j.jnucmat.2008.09.012

Cited by 36 publications

(11 citation statements)

References 45 publications

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“…In order to incorporate the cooling rate effect in Koistinen-Marburger relation, Eq. (2) is written in a modified form by absorbing in the prefactor the cooling rate b in an explicit manner [113]. As judged from Fig.…”

Section: Martensitic Transformation Kineticsmentioning

confidence: 99%

A study on martensitic phase transformation in 9Cr–1W–0.23V–0.063Ta–0.56Mn–0.09C–0.02N (wt.%) reduced activation steel using differential scanning calorimetry

Raju

Ganesh

Kumar

et al. 2010

Journal of Nuclear Materials

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Section: Martensitic Transformation Kineticsmentioning

confidence: 99%

A study on martensitic phase transformation in 9Cr–1W–0.23V–0.063Ta–0.56Mn–0.09C–0.02N (wt.%) reduced activation steel using differential scanning calorimetry

Raju

Ganesh

Kumar

et al. 2010

Journal of Nuclear Materials

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“…The DSC curve in Figure 8 shows endothermic peak around 297 • C upon heating the 30 h milled and pressed Co powder, followed by a small and large exothermic peaks at 426 and 707 • C, respectively. It is well known that endothermic peaks show phase transformation in certain pure metals [42,43] including Co [5]. However, since our powder has no HCP phase after milling, this endothermic peak at 297 • C cannot be related to allotropic HCP to FCC phase transition.…”

Section: Resultsmentioning

confidence: 80%

Effect of Mechanical Milling and Cold Pressing on Co Powder

Bolokang

Phasha

Motaung

et al. 2012

Journal of Metallurgy

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Cold pressing (CP) of the amorphous-like Co powder suppressed most of the XRD peaks, in particular the peak along (100) plane. The DSC curve of unmilled CP Co powder has shown a distinct sharp exothermic peak at615C°. Upon annealing at700C°, only the FCC phase with lattice parameter of 3.51 Å was detected by XRD. Our results implied that the exotherm at615C°corresponds to compaction-pressure-assisted HCP to FCC first-order phase transition. The XRD analysis of 30 h milled powder revealed for the first time the FCC phase witha=3.80 Å. However, due to presence of (100) and (210) peaks, this phase is thought to be FCT with lattice parametersa=b=3.80andc=3.07 Å. Consequently, the high-energy milling carried out in the current work induced for the first time HCP to FCT transition in Co. Upon CP of milled powder, the lattice parameterashrunk from 3.80 to 3.75 Å. However, during annealing of the CP milled Co powder at750C°, the FCT to FCC transition occurred, yielding the FCC phase witha=3.51 Å.

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“…The differential scanning calorimetry (DSC) experiments were performed in Setaram Setsys Evolution 1600 Ò , heat flux type calorimeter, using small samples of 50 to 70 mg mass. Based on previous experience, Uranium has been used as an additional secondary calibration standard, both for temperature and heat flux [14]. The on-heating and cooling phase transformation sequence up to melting is determined by performing a slow scan experiment at 1 K min -1 under 50 mL per min Ar flow.…”

Section: Methodsmentioning

confidence: 99%

Differential Scanning Calorimetry Study of U–Cr Alloys

Santhosh

Raju

et al. 2015

Trans Indian Inst Met

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The high temperature phase stability characteristics of U-xCr (x = 0, 1, 2, 3, 4, 5, 7, 9, 15 wt%) alloys have been investigated by dynamic calorimetry under slow heating (1 K min -1 ) in pure flowing Ar-atmosphere. The temperatures of various eutectic, eutectoid solid state phase transformations and that of melting have been measured as a function of Cr-content. These data are used to construct a partial U-Cr phase diagram on U-rich side, which showed good agreement with the recent assessment. The liquidus temperatures for higher Cr-contents, however exhibited a small upward shift as compared to equilibrium phase diagram estimates. The measured transformation enthalpies for the on-heating eutectoid and eutectic transformations exhibited an increase with Cr content of the alloys.

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Effect of heating and cooling rate on the kinetics of allotropic phase changes in uranium: A differential scanning calorimetry study

Cited by 36 publications

References 45 publications

A study on martensitic phase transformation in 9Cr–1W–0.23V–0.063Ta–0.56Mn–0.09C–0.02N (wt.%) reduced activation steel using differential scanning calorimetry

A study on martensitic phase transformation in 9Cr–1W–0.23V–0.063Ta–0.56Mn–0.09C–0.02N (wt.%) reduced activation steel using differential scanning calorimetry

Effect of Mechanical Milling and Cold Pressing on Co Powder

Differential Scanning Calorimetry Study of U–Cr Alloys

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