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Rheology of rock salt for salt tectonics modeling

Petroleum Science 2016年第4期13卷 712-724页

作者： Shi-Yuan Li Janos L.Urai School of Petroleum Engineering China University of PetroleumBeijing Endogene Dynamik Faculty of Geo-Resources and Materials Technology RWTH Aachen University

Numerical modeling of salt tectonics is a rapidly evolving field; however, the constitutive equations to model long-term rock salt rheology in nature still remain controversial. Firstly, we built a database about the strain rate versus the differential stress through collecting the data from salt creep experiments at a range of temperatures（20–200 ℃） in laboratories. The aim is to collect data about salt deformation in nature, and the flow properties can be extracted from the data in laboratory ***, as an important preparation for salt tectonics modeling, a numerical model based on creep experiments of rock salt was developed in order to verify the specific model using the Abaqus package. Finally, under the condition of low differential stresses, the deformation mechanism would be extrapolated and discussed according to microstructure research. Since the studies of salt deformation in nature are the reliable extrapolation of laboratory data, we simplified the rock salt rheology to dislocation creep corresponding to power law creep（n = 5） with the appropriate material parameters in the salt tectonic modeling.

关键词： Rock salt rheology Power law creep dislocation creep Modeling

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Characteristics of hot tensile deformation and microstructure evolution of twin-roll cast AZ31B magnesium alloys

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 776-782页

作者：刘志民邢书明鲍培玮李楠姚淑娜张密兰 School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University

High temperature tensile properties and microstructure evolutions of twin-roll-cast AZ31B magnesium alloy were investigated over a strain rate range from 10-3 to 1 *** is suggested that the dominant deformation mechanism in the lower strain rate regimes is dislocation creep controlled by grain boundary diffusion at lower temperature and by lattice diffusion at higher temperatures,***,dislocation glide and twinning are dominant deformation mechanisms at higher *** processing map,the effective diffusion coefficient and activation energy map of the alloy were *** relations of microstructure evolutions to the transition temperature of dominant diffusion process,the activation energy platform and the occurrence of the full dynamic recrystallization with the maximum peak efficiency were *** is revealed that the optimum conditions for thermo-mechanical processing of the alloy are at a temperature range from 553 to 593 K,and a strain rate range from 7×10-3 to 2×10-3 s-1.

关键词： magnesium AZ31B alloy twin-roll cast processing map dislocation creep effective diffusion coefficient

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Rheological Strength of UHP Eclogite from Dabieshan: Evidences from High p-T Experiments

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Journal of Earth Science 2001年第3期 3-8页

作者： Zhang JunfengGraduate School, China University of Geosciences, Wuhan 430074 Institute of Geophysics & Planetary Physics, University of California, Riverside, CA 92521, USAJin ZhenminFaculty of Earth Sciences, China University of Geosciences, Wuhan 430074

We present here experimental study of the rheological properties of UHP eclogite from Dabie at a pressure of 3 GPa by utilizing the 5 GPa Griggs type piston cylinder apparatus. The rheological constitutive equation of eclogite is determined with a stress exponent of 3.4, an activation energy of 480 kJ/mol and a preexponential factor of 103.3. Our!study shows that: (1) As a typical two phase rock, the flow strength of eclogite depends on the proportions of the strong phase (garnet) and the weak phase (omphacite); (2) The plastic deformation of eclogite is dominated by dislocation creep; (3) Based on that eclogite has the same strength as the upper mantle harzburgite, our study suggests that the delamination of the subducting crust component from the underlying upper mantle is unlikely. Therefore, the stretching after the collision orogeny coupled with the upwelling of the upper mantle may play a more important role in the exhumation of UHP rocks.

关键词： UHP eclogite rheological strength dislocation creep high p T experiment delamination Dabieshan.

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Effect of Ca addition on microstructure and impression creep behavior of cast AZ61 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2019年第10期29卷 2056-2065页

作者： B.NAMI S.M.MIRESMAEILI F.JAMSHIDI I.KHOUBROU Department of Materials Engineering and New Technologies Shahid Rajaee Teacher Training University

Microstructure and creep properties of AZ61 alloy containing 1 and 3 wt.% Ca were investigated. The creep properties were examined using impression method under different stresses between 200 and 500 MPa at the temperature ranging from 423 to 491 K. The microstructure of AZ61 alloy contains α(Mg) matrix and Mg17 Al12 intermetallic phases. It is shown that adding Ca to AZ61 alloy reduces the amount of Mg17 Al12 phase via forming(Mg,Al)2 Ca phase;furthermore, increasing the Ca content to 3 wt.% leads to the formation of(Mg,Al)2 Ca phase, as well as the elimination of the Mg17 Al12 phase. creep properties of AZ61 alloy are improved with the Ca addition. The improvement in creep properties is attributed to the reduction in the amount of Mg17 Al12 phase and the formation of(Mg,Al)2 Ca phase with high thermal stability. According to the obtained creep data, it is concluded that the pipe diffusion-climb controlled dislocation creep is the dominant creep mechanism and Ca addition has no influence on this mechanism. The effect of pre-deformation on the creep properties of AZ61+3%Ca alloy reveals that the creep resistance of the alloy depends on the continuity of(Mg,Al)2 Ca phase. It is decreased by reducing the phase continuity.

关键词： impression creep magnesium alloy Ca addition dislocation creep phase continuity

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