Dynamic mechanical performances of 30CrMnSiNi2A alloy steel under high pressure of 1-15 GPa are studied with a one stage light gas gun. With the particle velocity ranging from 150 m/s to 300 m/s, the Hugoniot curve ...Dynamic mechanical performances of 30CrMnSiNi2A alloy steel under high pressure of 1-15 GPa are studied with a one stage light gas gun. With the particle velocity ranging from 150 m/s to 300 m/s, the Hugoniot curve of 30CrMnSiNi2A alloy steel is analyzed and obtained based on the experimental data and the parameters of equation of state are obtained by calculating. The Grüneisen equation of state can be determined through these parameters.展开更多
Ⅰ. INTRODUCTIONAlH<sub>3</sub> is a hydride with higher hydrogen content. Thus, many scientists are very interested in it. In recent years, properties of AlH<sub>3</sub> have been much studied...Ⅰ. INTRODUCTIONAlH<sub>3</sub> is a hydride with higher hydrogen content. Thus, many scientists are very interested in it. In recent years, properties of AlH<sub>3</sub> have been much studied under the atmospheric pressure, but less under high pressure. Our purposes in studying the properties of hydrides under high pressure are as follows:展开更多
Water in the deep Earth’s interior has important and profound impacts on the geodynamical properties at high-temperature(T)and high-pressure(P)conditions.A series of dense hydrous Mg-silicate(DHMS)phases are generate...Water in the deep Earth’s interior has important and profound impacts on the geodynamical properties at high-temperature(T)and high-pressure(P)conditions.A series of dense hydrous Mg-silicate(DHMS)phases are generated from dehydration of serpentines in subduction slabs below the lithosphere,including phase A,chondrodite,clinohumite,phase E,superhydrous phase B and phase D.On the other hand,olivine and its high-P polymorphs of wadsleyite and ringwoodite are dominant nominally anhydrous minerals(NAMs)in the upper mantle and transition zone,which could contain significant amount of water in the forms of hydroxyl group(OH-)defects.The water solubilities in wadsleyite and ringwoodite are up to about 3 weight percent(wt.%),making the transition zone a most important layer for water storage in the mantle.Hydration can significantly affect the pressure-volumetemperature equations of state(P-V-T EOSs)for the DHMS and NAM phases,including the thermal expansivities and isothermal bulk moduli.In this work,we collected the reported datasets for the DHMS and NAM phases,and reconstruct internally consistent EOSs.Next,we further evaluated the thermodynamic Grüneisen parameters,which are fundamental for constraining the temperature distribution in an isentropic process,such as mantle convection.The adiabatic temperature profiles are computed for these minerals in the geological settings of normal mantle and subduction zone,and our calculation indicates that temperature is the dominant factor in determining the gradient of a geotherm,rather than the mineralogical composition.展开更多
Ⅰ. INTRODUCTIONMelting of metals is a very interesting physical phenomenon. The exact theoretical calculation about it involves the calculation of free energy in solid and liquid states, which is very difficult. Star...Ⅰ. INTRODUCTIONMelting of metals is a very interesting physical phenomenon. The exact theoretical calculation about it involves the calculation of free energy in solid and liquid states, which is very difficult. Starting from the vibration amplitude of atoms, Lindemann gave the well-known melting law, which has been extensively applied to the melting phenomenon. The depen-展开更多
文摘Dynamic mechanical performances of 30CrMnSiNi2A alloy steel under high pressure of 1-15 GPa are studied with a one stage light gas gun. With the particle velocity ranging from 150 m/s to 300 m/s, the Hugoniot curve of 30CrMnSiNi2A alloy steel is analyzed and obtained based on the experimental data and the parameters of equation of state are obtained by calculating. The Grüneisen equation of state can be determined through these parameters.
文摘Ⅰ. INTRODUCTIONAlH<sub>3</sub> is a hydride with higher hydrogen content. Thus, many scientists are very interested in it. In recent years, properties of AlH<sub>3</sub> have been much studied under the atmospheric pressure, but less under high pressure. Our purposes in studying the properties of hydrides under high pressure are as follows:
基金supported by the National Natural Science Foundation of China(No.42072050)the Science Fund for Distinguished Young Scholars of Hubei Province(No.2020CFA104)。
文摘Water in the deep Earth’s interior has important and profound impacts on the geodynamical properties at high-temperature(T)and high-pressure(P)conditions.A series of dense hydrous Mg-silicate(DHMS)phases are generated from dehydration of serpentines in subduction slabs below the lithosphere,including phase A,chondrodite,clinohumite,phase E,superhydrous phase B and phase D.On the other hand,olivine and its high-P polymorphs of wadsleyite and ringwoodite are dominant nominally anhydrous minerals(NAMs)in the upper mantle and transition zone,which could contain significant amount of water in the forms of hydroxyl group(OH-)defects.The water solubilities in wadsleyite and ringwoodite are up to about 3 weight percent(wt.%),making the transition zone a most important layer for water storage in the mantle.Hydration can significantly affect the pressure-volumetemperature equations of state(P-V-T EOSs)for the DHMS and NAM phases,including the thermal expansivities and isothermal bulk moduli.In this work,we collected the reported datasets for the DHMS and NAM phases,and reconstruct internally consistent EOSs.Next,we further evaluated the thermodynamic Grüneisen parameters,which are fundamental for constraining the temperature distribution in an isentropic process,such as mantle convection.The adiabatic temperature profiles are computed for these minerals in the geological settings of normal mantle and subduction zone,and our calculation indicates that temperature is the dominant factor in determining the gradient of a geotherm,rather than the mineralogical composition.
文摘Ⅰ. INTRODUCTIONMelting of metals is a very interesting physical phenomenon. The exact theoretical calculation about it involves the calculation of free energy in solid and liquid states, which is very difficult. Starting from the vibration amplitude of atoms, Lindemann gave the well-known melting law, which has been extensively applied to the melting phenomenon. The depen-
