Determination of activation energy of phase transformation and recrystallization using a modified kissinger method

Sha, Wei

doi:10.1007/s11661-001-1041-6

Cited by 17 publications

(6 citation statements)

References 16 publications

(11 reference statements)

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“…According to the three exothermic peaks of particles, the apparent activation energy, the frequency factor, and the peak temperature when is zero were determined by Kissinger's method [16,17]. Furthermore, the thermal stability of explosives can be counted by (2) and (3) [18][19][20], and the results are shown in Table 1.…”

Section: Thermal Analysismentioning

confidence: 99%

Efficient Preparation and Performance Characterization of the HMX/F₂₆₀₂ Microspheres by One-Step Granulation Process

Hou

Jia

Wang

et al. 2017

Journal of Nanomaterials

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A new one-step granulation process for preparing high melting explosive-(HMX-) based PBX was developed. HMX/F 2602 microspheres were successfully prepared by using HMX and F 2602 as the main explosive and binder, respectively. The particle morphology, particle size, crystal structure, thermal stability, and impact sensitivity of the as-prepared HMX/F 2602 microspheres were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), laser particle size analyzer, differential scanning calorimetry (DSC), and impact sensitivity test, respectively. The SEM analysis indicated successful coating of F 2602 on the surface of HMX, and the resulting particles are ellipsoidal or spherical with a median particle size of 940 nm; the XRD analysis did not show any change in the crystal structure after the coating and still has -HNX crystal structure; according to the DSC analysis, HMX/F 2602 prepared by the new method has better thermal stability compared to that prepared by the water suspension process. The impact sensitivity of HMX/F 2602 prepared by this one-step granulation process decreased, and its characteristic height H 50 increased from 37.62 to 40.13 cm, thus significantly improving the safety performance. More importantly, this method does not need the freeze-drying process after recrystallization, thus increasing the efficiency by 2 to 3 times.

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Section: Thermal Analysismentioning

confidence: 99%

Efficient Preparation and Performance Characterization of the HMX/F₂₆₀₂ Microspheres by One-Step Granulation Process

Hou

Jia

Wang

et al. 2017

Journal of Nanomaterials

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“…The grain size of the eutectic Al phase during the first heating cycle was smaller than that during the second heating cycle. The activation energy was calculated using the modified Kissinger model, [19,20] which is represented by Eq. [1]:…”

Section: Recrystallizationmentioning

confidence: 99%

Localized Recrystallization in Cast Al-Si-Mg Alloy during Solution Heat Treatment: Dilatometric and Calorimetric Studies

Chaudhury

Warke²,

Shankar³

et al. 2011

Metall Mater Trans A

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During heat treatment, the work piece experiences a range of heating rates depending upon the sizes and types of furnace. When the Al-Si-Mg cast alloy is heated to the solutionizing temperature, recrystallization takes place during the ramp-up stage. The effect of heating rate on recrystallization in the A356 (Al-Si-Mg) alloy was studied using dilatometric and calorimetric methods. Recrystallization in as-cast Al-Si alloys is a localized event and is confined to the elasto-plastic zone surrounding the eutectic Si phase; there is no evidence of recrystallization in the center of the primary Al dendritic region. The size of the elasto-plastic zone is of the same order of magnitude as the Si particles, and recrystallized grains are observed in the elasto-plastic region near the Si particles. The coefficient of thermal expansion of Al is an order of magnitude greater than Si, and thermal stresses are generated due to the thermal mismatch between the Al phase and Si particles providing the driving force for recrystallization. In contrast, recrystallization in Al wrought alloy (7075) occurs uniformly throughout the matrix, stored energy due to cold work being the driving force for recrystallization in wrought alloys. The activation energy for recrystallization in as-cast A356 alloy is 127 KJ/mole. At a slow heating rate of 4.3 K/min, creep occurs during the heating stage of solution heat treatment. However, creep does not occur in samples heated at higher heating rates, namely, 520, 130, and 17.3 K/min.

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“…From the dependence on the heating rate, it is possible to determine the activation energy of the phenomenon responsible for the peak, according to the modified Kissinger method [14]. The method is based on the following equation …”

Section: Resultsmentioning

confidence: 99%

Influence of the heating rate on sintering shrinkage of plain iron

Baselli

Molinari

2021

Powder Metallurgy

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The effect of heating rate on shrinkage of plain iron was investigated on green specimens with different green densities: 6.5, 6.9 and 7.3 g cm −3 . On increasing the heating rate, the anisothermal shrinkage in the alpha field starts at higher temperatures but its amount does not change. The activation energy corresponds to that of dislocation pipe diffusion, confirming the role of the structural defects accumulated in the particles during cold compaction. The isothermal shrinkage increases on increasing the heating rate, likely due to the effect of surface diffusion at lower temperatures that reduce the driving force, without a measurable effect on shrinkage. The effect of green density is the same for anisothermal and isothermal shrinkage, with a minimum (in absolute value) at the intermediate green density.

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Determination of activation energy of phase transformation and recrystallization using a modified kissinger method

Abstract: Communications(1) orthorhombic phase (O phase) → ␣ 2 , using transformation start temperatures; andDetermination of Activation Energy of (2) ␣ 2 S (Widmanstätten) complete dissolution, using transformation finish temperatures.

Cited by 17 publications

References 16 publications

Efficient Preparation and Performance Characterization of the HMX/F₂₆₀₂ Microspheres by One-Step Granulation Process

Efficient Preparation and Performance Characterization of the HMX/F₂₆₀₂ Microspheres by One-Step Granulation Process

Localized Recrystallization in Cast Al-Si-Mg Alloy during Solution Heat Treatment: Dilatometric and Calorimetric Studies

Influence of the heating rate on sintering shrinkage of plain iron

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Determination of activation energy of phase transformation and recrystallization using a modified kissinger method

Abstract: Communications(1) orthorhombic phase (O phase) → ␣ 2 , using transformation start temperatures; andDetermination of Activation Energy of (2) ␣ 2 S (Widmanstätten) complete dissolution, using transformation finish temperatures.

Cited by 17 publications

References 16 publications

Efficient Preparation and Performance Characterization of the HMX/F2602 Microspheres by One-Step Granulation Process

Efficient Preparation and Performance Characterization of the HMX/F2602 Microspheres by One-Step Granulation Process

Localized Recrystallization in Cast Al-Si-Mg Alloy during Solution Heat Treatment: Dilatometric and Calorimetric Studies

Influence of the heating rate on sintering shrinkage of plain iron

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Efficient Preparation and Performance Characterization of the HMX/F₂₆₀₂ Microspheres by One-Step Granulation Process

Efficient Preparation and Performance Characterization of the HMX/F₂₆₀₂ Microspheres by One-Step Granulation Process