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Fusheng Pan - One of the best experts on this subject based on the ideXlab platform.

  • dynamic recrystallization behavior and hot workability of mg 2 0zn 0 3zr 0 9y alloy by using hot compression test
    Materials & Design, 2014
    Co-Authors: Jian Peng, Yongjian Wang, Liping Zhong, Aitao Tang, Fusheng Pan
    Abstract:

    The hot deformation behavior, dynamic recrystallization (DRX) evolution and hot workability of Mg–2.0Zn–0.3Zr–0.9Y alloy were studied by compression test. Compression experiments were performed in temperature range of 250–400 °C and strain rate range of 0.001–1 s−1 using Gleeble 1500D thermo-mechanical simulator. Based on the regression analysis for Arrhenius type Equation of flow behavior, the apparent average activation energy of deformation was determined as Q = 236.2 KJ/mol. The DRX kinetic model of Mg–2.0Zn–0.3Zr–0.9Y alloy was established as XDRX=1-exp-1.30(e-ece∗)1.51. The DRX kinetic model is sensitive to the DRX mechanism changes caused by deformation conditions. The DRX kinetic model and instability zones were validated by means of microstructure observation.

  • constitutive modeling of dynamic recrystallization kinetics and processing maps of mg 2 0zn 0 3zr alloy based on true stress strain curves
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Jian Peng, Aitao Tang, Dawei Shi, Fusheng Pan
    Abstract:

    Abstract To investigate the effects on the dynamic recrystallization (DRX) behaviors, Mg–2.0Zn–0.3Zr alloy compression experiments with height reduction 60% were performed at the temperatures of 300 °C, 350 °C, 400 °C, 450 °C and 500 °C, and the strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1 and 1 s−1 on a Gleeble 1500 thermo-mechanical simulator. By means of regression analysis for the Arrhenius type Equation of flow behavior, the apparent average activation energy of deformation was determined as Q=169.8 KJ/mol. From the Avrami type Equation, the DRX kinetic model of Mg–2.0Zn–0.3Zr alloy is described as X DRX = 1 − exp [ − 1.3250 ( e - e c e ⁎ ) 2.0405 ] . Through the flow stress behavior, the processing maps are calculated and analyzed according to the dynamic material model (DMM). In the processing map the variation of the efficiency of the power dissipation is fitted to a function of temperature and strain rate. The processing maps exhibit two domains of complete DRX occurring (350–500 °C at 0.001 s−1, 400–500 °C at 0.01–1 s−1) which are the optimum parameters for hot working of the alloy.

Albert Ibarz - One of the best experts on this subject based on the ideXlab platform.

  • rheological behaviour of concentrated mandarin juice at low temperatures
    International Journal of Food Science and Technology, 2010
    Co-Authors: Victor Falguera, Jorge F Velezruiz, Veronica Alins, Albert Ibarz
    Abstract:

    Summary Several rheological properties of concentrated mandarin juice were investigated, quantifying thixotropic behaviour and fitting experimental data to the Hahn, Weltman, and Figoni–Shoemaker Equations. The latter one proved best for modelling the time dependency response. Pseudoplastic behaviour fitted well with the Herschel–Bulkley model in the interval between −12 and 6 °C, in which yield stress and the flow behaviour index scarcely changed with temperature. The consistency coefficient and apparent viscosity both decreased as temperature increased. Fitting these consistency data to the Arrhenius-Type Equation, a value of 33 kJ mol−1 for activation energy was obtained. Concentrated mandarin juice displayed viscoelastic properties in the temperature range between −12 and 6 °C, with the elastic character (determined by the juice’s pectin content) predominating over the viscous nature at low frequency values, but with this behaviour being inverted for high values. Furthermore, as the temperature became higher, the elastic character became more important than the viscous nature.

  • original article rheological behaviour of concentrated mandarin juice at low temperatures
    2010
    Co-Authors: Victor Falguera, Albert Ibarz
    Abstract:

    Summary Several rheological properties of concentrated mandarin juice were investigated, quantifying thixotropic behaviour and fitting experimental data to the Hahn, Weltman, and Figoni–Shoemaker Equations. The latter one proved best for modelling the time dependency response. Pseudoplastic behaviour fitted well with the Herschel–Bulkley model in the interval between )12 and 6 � C, in which yield stress and the flow behaviour index scarcely changed with temperature. The consistency coefficient and apparent viscosity both decreased as temperature increased. Fitting these consistency data to the Arrhenius-Type Equation, a value of 33 kJ mol )1 for activation energy was obtained. Concentrated mandarin juice displayed viscoelastic properties in the temperature range between )12 and 6 � C, with the elastic character (determined by the juice’s pectin content) predominating over the viscous nature at low frequency values, but with this behaviour being inverted for high values. Furthermore, as the temperature became higher, the elastic character became more important than the viscous nature.

  • Rheological behaviour of sloe (Prunus spinosa) fruit juices
    Journal of Food Engineering, 1999
    Co-Authors: Albert Ibarz, A. Garvin, José Sánchez Costa
    Abstract:

    Abstract The rheological behaviour of sloe fruit juices with low pulp and pectins contents is studied. These juices, containing pectins and pulp, behave as non-Newtonian with a yield stress, so the Bingham model was used to describe the relationship between the shear stress and the shear rate. The effect of temperature on the plastic viscosity was examined, and it was concluded that an Arrhenius type Equation describes this effect. The effect of soluble solids contents can be described by two types of Equations, power-law and exponential expressions. Finally, an Equation describing the combined effect of temperature and concentration on the plastic viscosity was developed.

  • rheology of clarified fruit juices iii orange juices
    Journal of Food Engineering, 1994
    Co-Authors: Albert Ibarz, C Gonzalez, Santiago Esplugas
    Abstract:

    The rheological behaviour of depectinated orange juice has been determined over a wide range of temperatures (5–70°C) and concentrations (30·7–63·5°Brix), using a concentric cylinder viscometer. The results indicated that depectinated clarified orange juice behaves as a Newtonian fluid. The effect of temperature on that juice can be described by an Arrhenius-Type Equation. It was found that the activation energy for viscous flow was in the range 4·23-9·59 kcal mol−1, depending on the concentration. The effect of concentration can be described by two types of Equation: potential and exponential. Finally, an Equation in which dynamic viscosity depends on temperature and water activity gives the following expression: η=1·03×10−4(aw)−19·9exp(3065/T)

Jian Peng - One of the best experts on this subject based on the ideXlab platform.

  • dynamic recrystallization behavior and hot workability of mg 2 0zn 0 3zr 0 9y alloy by using hot compression test
    Materials & Design, 2014
    Co-Authors: Jian Peng, Yongjian Wang, Liping Zhong, Aitao Tang, Fusheng Pan
    Abstract:

    The hot deformation behavior, dynamic recrystallization (DRX) evolution and hot workability of Mg–2.0Zn–0.3Zr–0.9Y alloy were studied by compression test. Compression experiments were performed in temperature range of 250–400 °C and strain rate range of 0.001–1 s−1 using Gleeble 1500D thermo-mechanical simulator. Based on the regression analysis for Arrhenius type Equation of flow behavior, the apparent average activation energy of deformation was determined as Q = 236.2 KJ/mol. The DRX kinetic model of Mg–2.0Zn–0.3Zr–0.9Y alloy was established as XDRX=1-exp-1.30(e-ece∗)1.51. The DRX kinetic model is sensitive to the DRX mechanism changes caused by deformation conditions. The DRX kinetic model and instability zones were validated by means of microstructure observation.

  • constitutive modeling of dynamic recrystallization kinetics and processing maps of mg 2 0zn 0 3zr alloy based on true stress strain curves
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Jian Peng, Aitao Tang, Dawei Shi, Fusheng Pan
    Abstract:

    Abstract To investigate the effects on the dynamic recrystallization (DRX) behaviors, Mg–2.0Zn–0.3Zr alloy compression experiments with height reduction 60% were performed at the temperatures of 300 °C, 350 °C, 400 °C, 450 °C and 500 °C, and the strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1 and 1 s−1 on a Gleeble 1500 thermo-mechanical simulator. By means of regression analysis for the Arrhenius type Equation of flow behavior, the apparent average activation energy of deformation was determined as Q=169.8 KJ/mol. From the Avrami type Equation, the DRX kinetic model of Mg–2.0Zn–0.3Zr alloy is described as X DRX = 1 − exp [ − 1.3250 ( e - e c e ⁎ ) 2.0405 ] . Through the flow stress behavior, the processing maps are calculated and analyzed according to the dynamic material model (DMM). In the processing map the variation of the efficiency of the power dissipation is fitted to a function of temperature and strain rate. The processing maps exhibit two domains of complete DRX occurring (350–500 °C at 0.001 s−1, 400–500 °C at 0.01–1 s−1) which are the optimum parameters for hot working of the alloy.

Aitao Tang - One of the best experts on this subject based on the ideXlab platform.

  • dynamic recrystallization behavior and hot workability of mg 2 0zn 0 3zr 0 9y alloy by using hot compression test
    Materials & Design, 2014
    Co-Authors: Jian Peng, Yongjian Wang, Liping Zhong, Aitao Tang, Fusheng Pan
    Abstract:

    The hot deformation behavior, dynamic recrystallization (DRX) evolution and hot workability of Mg–2.0Zn–0.3Zr–0.9Y alloy were studied by compression test. Compression experiments were performed in temperature range of 250–400 °C and strain rate range of 0.001–1 s−1 using Gleeble 1500D thermo-mechanical simulator. Based on the regression analysis for Arrhenius type Equation of flow behavior, the apparent average activation energy of deformation was determined as Q = 236.2 KJ/mol. The DRX kinetic model of Mg–2.0Zn–0.3Zr–0.9Y alloy was established as XDRX=1-exp-1.30(e-ece∗)1.51. The DRX kinetic model is sensitive to the DRX mechanism changes caused by deformation conditions. The DRX kinetic model and instability zones were validated by means of microstructure observation.

  • constitutive modeling of dynamic recrystallization kinetics and processing maps of mg 2 0zn 0 3zr alloy based on true stress strain curves
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Jian Peng, Aitao Tang, Dawei Shi, Fusheng Pan
    Abstract:

    Abstract To investigate the effects on the dynamic recrystallization (DRX) behaviors, Mg–2.0Zn–0.3Zr alloy compression experiments with height reduction 60% were performed at the temperatures of 300 °C, 350 °C, 400 °C, 450 °C and 500 °C, and the strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1 and 1 s−1 on a Gleeble 1500 thermo-mechanical simulator. By means of regression analysis for the Arrhenius type Equation of flow behavior, the apparent average activation energy of deformation was determined as Q=169.8 KJ/mol. From the Avrami type Equation, the DRX kinetic model of Mg–2.0Zn–0.3Zr alloy is described as X DRX = 1 − exp [ − 1.3250 ( e - e c e ⁎ ) 2.0405 ] . Through the flow stress behavior, the processing maps are calculated and analyzed according to the dynamic material model (DMM). In the processing map the variation of the efficiency of the power dissipation is fitted to a function of temperature and strain rate. The processing maps exhibit two domains of complete DRX occurring (350–500 °C at 0.001 s−1, 400–500 °C at 0.01–1 s−1) which are the optimum parameters for hot working of the alloy.

Yang Luo - One of the best experts on this subject based on the ideXlab platform.

  • understanding and measurement for the binding energy of hydrogen bonds of biomass derived hydroxyl compounds
    Journal of Physical Chemistry A, 2018
    Co-Authors: Yang Luo, Yuxia Sun, Penghua Che, Xin Nie, Tianlong Wang
    Abstract:

    Experimental measurement for the binding energy of hydrogen-bonds (HBs) has long been an attractive and challenging topic in chemistry and biochemistry. In the present study, the binding energy of OH···O HBs can be determined by 1H NMR technique using a set of model biomass-derived hydroxyl compounds, including furfuryl alcohol, isosorbide, tetrahydrofurfuryl alcohol, and (S)-3-hydroxytetrahydrofuran. By performing concentration- and temperature-variation experiments, we put forward a modified Arrhenius-Type Equation, in which the compensated natural logarithm of the chemical shift (ln δ + Δδ) is linearly correlated with 1/T. HBs energies can be directly determined by the slope of the plot, and are substantiated by density functional theory (DFT) theoretical calculations. This study provides a reliable method to measure the binding energy of OH···O HBs in hydroxyl-containing biomass-derived feedstocks.