Temperature-dependent constitutive modeling of a magnesium alloy ZEK100 sheet using crystal plasticity models combined with in situ high-energy X-ray diffraction experiment  

作　　者：Hyuk Jong Bong Xiaohua Hu Xin Sun Yang Ren 

机构地区：[1]Materials Deformation Department,Korea Institute of Materials Science,Changwon,Gyeongnam 51508,South Korea [2]Energy and Transportation Science Division,Oak Ridge National Laboratory,Oak Ridge,TN 37831,USA [3]X-ray Science Division,Argonne National Laboratory,IL 60439,USA

出　　处：《Journal of Magnesium and Alloys》2022年第10期2801-2816,共16页镁合金学报（英文）

基　　金：the supports by the Fundamental Research Program of the Korea Institute of Materials Science(KIMS,PNK7760)。

摘　　要：A multiscale crystal plasticity model accounting for temperature-dependent mechanical behaviors without introducing a larger number of unknown parameters was developed.The model was implemented in elastic-plastic self-consistent(EPSC)and crystal plasticity finite element(CPFE)frameworks for grain-scale simulations.A computationally efficient EPSC model was first employed to estimate the critical resolved shear stress and hardening parameters of the slip and twin systems available in a hexagonal close-packed magnesium alloy,ZEK100.The constitutive parameters were thereafter refined using the CPFE.The crystal plasticity frameworks incorporated with the temperature-dependent constitutive model were used to predict stress–strain curves in macroscale and lattice strains in microscale at different testing temperatures up to 200℃.In particular,the predictions by the crystal plasticity models were compared with the measured lattice strain data at the elevated temperatures by in situ high-energy X-ray diffraction,for the first time.The comparison in the multiscale improved the fidelity of the developed temperature-dependent constitutive model and validated the assumption with regard to the temperature dependency of available slip and twin systems in the magnesium alloy.Finally,this work provides a time-efficient and precise modeling scheme for magnesium alloys at elevated temperatures.

关 键 词：High-energy X-ray diffraction Crystal plasticity finite element Elastic-plastic self-consistent model TWIN Temperature 

分 类 号：TG146.22[一般工业技术—材料科学与工程]