Results presented in this study contribute to investigation of the microstructure and mechanical properties of the hot-rolled Fe16Mn0.6C steel plates.The steel plates have been produced by being hot-rolled at temperat...Results presented in this study contribute to investigation of the microstructure and mechanical properties of the hot-rolled Fe16Mn0.6C steel plates.The steel plates have been produced by being hot-rolled at temperatures ranging from 1100℃ to 850℃ in seven passes to 97.5% reduction in thickness and then cooled in a furnace of 650℃.Some plates have been annealed at temperatures ranging from 300℃ to 1100℃ for 5min to 60min,and then followed by water quenching.There are annealing twins in the hot-rolled Fe16Mn0.6C steel.Fe16Mn0.6C steel presents similar ductile behavior as X-IPTM steel,but much higher elongation than commercial martensitic steel (MP) 1000,dual phase (DP) 980,and transformation induced plasticity (TRIP) 980 steels.Fe16Mn0.6C steel experiences γε (-α) transformation in some local regions,but remains mostly austenite during the entire deformation process.Fe16Mn0.6C steel with special mechanical properties can be produced by using the appropriate anneal technology.Twinning induced plasticity(TWIP) effect only occurs in the Fe16Mn0.6C steel annealed at temperature higher than 900℃.展开更多
In this paper,the effect of different annealing processes on the microstructure,texture,and formability of ferritic stainless steel was studied in detail.The results showed that the grain size in the final sheet was l...In this paper,the effect of different annealing processes on the microstructure,texture,and formability of ferritic stainless steel was studied in detail.The results showed that the grain size in the final sheet was larger and the recrystallization texture was more uniform after the final recrystallization annealing of hot-rolled steel with continuous annealing than that without annealing or with batch annealing.In addition,the final sheet had a higher average r-value and the lowest planar anisotropy.展开更多
Based on X-ray photoelectron spectroscopy （XPS）, influences of different oxidants on band alignment of HfO2 films deposited by atomic layer deposition （ALD） are investigated in this paper. The measured valence ban...Based on X-ray photoelectron spectroscopy （XPS）, influences of different oxidants on band alignment of HfO2 films deposited by atomic layer deposition （ALD） are investigated in this paper. The measured valence band offset （VBO） value for H2O-based HfO2 increases from 3.17 eV to 3.32 eV after annealing, whereas the VBO value for O3-based HfO2 decreases from 3.57 eV to 3.46 eV. The research results indicate that the silicate layer changes in different ways for H2O-based and O3-based HfO2 films after the annealing process, which plays a key role in generating the internal electric field formed by the dipoles. The variations of the dipoles at the interface between the HfO2 and SiO2 after annealing may lewd the VBO values of H2O-based and O3-based HfO2 to vary in different ways, which fits with the variation of fiat band （VFB） voltage.展开更多
Ion implantation xvas used to bring silicon atoms into chemical vapor deposition SiO_(2).Two bands of photoluminescence spectra at about 540 and 640 nm were observed from the as-prepared samples.Thermal annealing beha...Ion implantation xvas used to bring silicon atoms into chemical vapor deposition SiO_(2).Two bands of photoluminescence spectra at about 540 and 640 nm were observed from the as-prepared samples.Thermal annealing behavior of the photoluminescence ivas studied.The possible origin of the photoluminescence is discussed.展开更多
A hybrid feature selection and classification strategy was proposed based on the simulated annealing genetic algorithm and multiple instance learning(MIL).The band selection method was proposed from subspace decomposi...A hybrid feature selection and classification strategy was proposed based on the simulated annealing genetic algorithm and multiple instance learning(MIL).The band selection method was proposed from subspace decomposition,which combines the simulated annealing algorithm with the genetic algorithm in choosing different cross-over and mutation probabilities,as well as mutation individuals.Then MIL was combined with image segmentation,clustering and support vector machine algorithms to classify hyperspectral image.The experimental results show that this proposed method can get high classification accuracy of 93.13% at small training samples and the weaknesses of the conventional methods are overcome.展开更多
In this paper, the effect of annealing temperature on the optical properties of palladium thin films has been investigated. The Pd thin films with thickness of about 123 ? were deposited on glass substrates by electro...In this paper, the effect of annealing temperature on the optical properties of palladium thin films has been investigated. The Pd thin films with thickness of about 123 ? were deposited on glass substrates by electron beam coating method. Then the palladium thin films were annealed in air at 350℃, 450℃, 550℃ and 650℃ for 1h and then cold slowly. All the initial Pd films were found to have amorphous structure. Their optical properties were studied as function of annealing temperature using Ultraviolet-Visible (UV-Vis) spectroscopy. The direct band gaps in Pd films have been de- termined. Decreasing the values of the direct band gap shows also increasing the Pd crystallite nanostructure with increasing annealing temperature.展开更多
Spherulitic morphology of pure poly lactic acid (PLLA) PLLA have investigated after thermal annealing. The morphology of spherulite of pure poly lactic acid (PLLA) PLLA have investigated after thermal annealing. The e...Spherulitic morphology of pure poly lactic acid (PLLA) PLLA have investigated after thermal annealing. The morphology of spherulite of pure poly lactic acid (PLLA) PLLA have investigated after thermal annealing. The effect of both annealing temperature and crystallization temperature on the formation of cracks was described by polarized optical microscope (POM). Non banded spherulite (fibrils) with cracks was detected in PLLA film after annealing at 160°C (180 min.) and isothermal crystallization temperatures at 140°C and 150°C. With increasing temperature after annealing treatment the size of spherulite is increased and more cracks are formed. The maximum growth rate of spherulites was found at 130°C. The physical ageing was carried out by annealing the PLLA sample at room temperature for several annealing time (ta) from 0 h to 720 h. The enthalpy relaxation has been studied by differential scanning calorimetry (DSC) through analysis of the endothermic peak of glass transition temperature, which increased and shifted towards higher temperature as the annealing time increased.展开更多
Effect of annealing temperature on the properties of CdS thin films are carried out in this work. Nanocrystalline cadmium sulphide (CdS) thin films were prepared using spray pyrolysis deposition (SPD) technique and th...Effect of annealing temperature on the properties of CdS thin films are carried out in this work. Nanocrystalline cadmium sulphide (CdS) thin films were prepared using spray pyrolysis deposition (SPD) technique and the structural, optical and electrical properties were investigated for different annealing temperature (as deposited, 300, 400 & 500 C). The surface morphology and compositional properties studied by SEM and EDX respectively. The crystal structure of CdS thin film was studied by X-ray diffraction. The crystallite size and lattice constant of SPD CdS thin films were investigated. The optical parameters such as transmittance, absorption coefficient and energy band gap of the films with thermal annealing temperature was investigated by UV/VIS spectrophotometer. The variation of band gap values of CdS thin film samples were found to be in the range of 2.51 to 2.8 eV. Electrical resistivity measurements were carried out in fourprobe Vander Pauw method at different temperature. So CdS films may be a good candidate for suitable application in various optoelectronic devices.展开更多
基金supported by the Key Research Foundation of Baoshan Iron & Steel Co.,Ltd.(No.D06EBEA207)
文摘Results presented in this study contribute to investigation of the microstructure and mechanical properties of the hot-rolled Fe16Mn0.6C steel plates.The steel plates have been produced by being hot-rolled at temperatures ranging from 1100℃ to 850℃ in seven passes to 97.5% reduction in thickness and then cooled in a furnace of 650℃.Some plates have been annealed at temperatures ranging from 300℃ to 1100℃ for 5min to 60min,and then followed by water quenching.There are annealing twins in the hot-rolled Fe16Mn0.6C steel.Fe16Mn0.6C steel presents similar ductile behavior as X-IPTM steel,but much higher elongation than commercial martensitic steel (MP) 1000,dual phase (DP) 980,and transformation induced plasticity (TRIP) 980 steels.Fe16Mn0.6C steel experiences γε (-α) transformation in some local regions,but remains mostly austenite during the entire deformation process.Fe16Mn0.6C steel with special mechanical properties can be produced by using the appropriate anneal technology.Twinning induced plasticity(TWIP) effect only occurs in the Fe16Mn0.6C steel annealed at temperature higher than 900℃.
基金funded by Shanghai Youth Science and Technology Development Star Project ( No. 15QB1400200)
文摘In this paper,the effect of different annealing processes on the microstructure,texture,and formability of ferritic stainless steel was studied in detail.The results showed that the grain size in the final sheet was larger and the recrystallization texture was more uniform after the final recrystallization annealing of hot-rolled steel with continuous annealing than that without annealing or with batch annealing.In addition,the final sheet had a higher average r-value and the lowest planar anisotropy.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 60976068 and 61076097)the Cultivation Fund of the Key Scientific and Technical Innovation Project,Ministry of Education of China (Grant No. 708083)
文摘Based on X-ray photoelectron spectroscopy （XPS）, influences of different oxidants on band alignment of HfO2 films deposited by atomic layer deposition （ALD） are investigated in this paper. The measured valence band offset （VBO） value for H2O-based HfO2 increases from 3.17 eV to 3.32 eV after annealing, whereas the VBO value for O3-based HfO2 decreases from 3.57 eV to 3.46 eV. The research results indicate that the silicate layer changes in different ways for H2O-based and O3-based HfO2 films after the annealing process, which plays a key role in generating the internal electric field formed by the dipoles. The variations of the dipoles at the interface between the HfO2 and SiO2 after annealing may lewd the VBO values of H2O-based and O3-based HfO2 to vary in different ways, which fits with the variation of fiat band （VFB） voltage.
基金Supported in part by State Key Laboratory for Materials Modification by Laser,Ion and Electron Beams of Dalian Polytechnic University.
文摘Ion implantation xvas used to bring silicon atoms into chemical vapor deposition SiO_(2).Two bands of photoluminescence spectra at about 540 and 640 nm were observed from the as-prepared samples.Thermal annealing behavior of the photoluminescence ivas studied.The possible origin of the photoluminescence is discussed.
文摘A hybrid feature selection and classification strategy was proposed based on the simulated annealing genetic algorithm and multiple instance learning(MIL).The band selection method was proposed from subspace decomposition,which combines the simulated annealing algorithm with the genetic algorithm in choosing different cross-over and mutation probabilities,as well as mutation individuals.Then MIL was combined with image segmentation,clustering and support vector machine algorithms to classify hyperspectral image.The experimental results show that this proposed method can get high classification accuracy of 93.13% at small training samples and the weaknesses of the conventional methods are overcome.
文摘In this paper, the effect of annealing temperature on the optical properties of palladium thin films has been investigated. The Pd thin films with thickness of about 123 ? were deposited on glass substrates by electron beam coating method. Then the palladium thin films were annealed in air at 350℃, 450℃, 550℃ and 650℃ for 1h and then cold slowly. All the initial Pd films were found to have amorphous structure. Their optical properties were studied as function of annealing temperature using Ultraviolet-Visible (UV-Vis) spectroscopy. The direct band gaps in Pd films have been de- termined. Decreasing the values of the direct band gap shows also increasing the Pd crystallite nanostructure with increasing annealing temperature.
文摘Spherulitic morphology of pure poly lactic acid (PLLA) PLLA have investigated after thermal annealing. The morphology of spherulite of pure poly lactic acid (PLLA) PLLA have investigated after thermal annealing. The effect of both annealing temperature and crystallization temperature on the formation of cracks was described by polarized optical microscope (POM). Non banded spherulite (fibrils) with cracks was detected in PLLA film after annealing at 160°C (180 min.) and isothermal crystallization temperatures at 140°C and 150°C. With increasing temperature after annealing treatment the size of spherulite is increased and more cracks are formed. The maximum growth rate of spherulites was found at 130°C. The physical ageing was carried out by annealing the PLLA sample at room temperature for several annealing time (ta) from 0 h to 720 h. The enthalpy relaxation has been studied by differential scanning calorimetry (DSC) through analysis of the endothermic peak of glass transition temperature, which increased and shifted towards higher temperature as the annealing time increased.
文摘Effect of annealing temperature on the properties of CdS thin films are carried out in this work. Nanocrystalline cadmium sulphide (CdS) thin films were prepared using spray pyrolysis deposition (SPD) technique and the structural, optical and electrical properties were investigated for different annealing temperature (as deposited, 300, 400 & 500 C). The surface morphology and compositional properties studied by SEM and EDX respectively. The crystal structure of CdS thin film was studied by X-ray diffraction. The crystallite size and lattice constant of SPD CdS thin films were investigated. The optical parameters such as transmittance, absorption coefficient and energy band gap of the films with thermal annealing temperature was investigated by UV/VIS spectrophotometer. The variation of band gap values of CdS thin film samples were found to be in the range of 2.51 to 2.8 eV. Electrical resistivity measurements were carried out in fourprobe Vander Pauw method at different temperature. So CdS films may be a good candidate for suitable application in various optoelectronic devices.
