The（submicron＋micron） bimodal size Si Cp-reinforced Mg matrix composite was compressed at the temperature of 270–420 °C and strain rate of 0.001–1 s^-1. Then, dynamic recrystallization（DRX） behavior of the...The（submicron＋micron） bimodal size Si Cp-reinforced Mg matrix composite was compressed at the temperature of 270–420 °C and strain rate of 0.001–1 s^-1. Then, dynamic recrystallization（DRX） behavior of the composite was investigated by thermodynamic method and verified by microstructure analysis. Results illustrated that the composite possess the lower critical strain and higher DRX ratio as compared to monolithic Mg alloys during hot deformation process. The predicted DRX ratio increased with the proceeding of compression, which was well consistent with the experimental value. Results from thermodynamic calculation suggested that the occurrence of DRX could be promoted by Si Cp, which would be further proved by microstructure analysis. Formation of particle deformation zone around micron Si Cp played a significant role in promoting DRX nucleation. Nevertheless, the distribution of submicron Si Cp was increasingly uniform with the proceeding of compression, which could fully restrain grain growth. Therefore, the corporate effects of micron and submicron Si Cp on DRX contributed to the improvement of DRXed ratio and the refinement of grain size for the composite during compression process.展开更多
The room temperature brittleness has been a long standing problem in bulk metallic glasses realm.This has seriously limited the application potential of metallic glasses and their composites.The elastic deformation be...The room temperature brittleness has been a long standing problem in bulk metallic glasses realm.This has seriously limited the application potential of metallic glasses and their composites.The elastic deformation behaviors of metallic glass matrix composites are closely related to their plastic deformation states.The elastic deformation behaviors of Cu48-xZr48Al4Nbx（x=0,3at.%）metallic glass matrix composites（MGMCs）with different crystallization degrees were investigated using an in-situ digital image correlation（DIC）technique during tensile process.With decreasing crystallization degree,MGMC exhibits obvious elastic deformation ability and an increased tensile fracture strength.The notable tensile elasticity is attributed to the larger shear strain heterogeneity emerging on the surface of the sample.This finding has implications for the development of MGMCs with excellent tensile properties.展开更多
Coal bed methane(CBM),the high-quality and efficient fuel,has caught the interest of many nations as they strive for environmentally friendly development.Therefore,the efficient exploitation and utilization of CBM has...Coal bed methane(CBM),the high-quality and efficient fuel,has caught the interest of many nations as they strive for environmentally friendly development.Therefore,the efficient exploitation and utilization of CBM has become one of the international focal research problems.A significant factor affecting the mining of CBM is coal permeability.To better capture the changes that occur during the extraction of CBM,the internal swelling coefficient of matrix(ISCM)has been gradually in permeability introduced into the permeability models,and such models have become an important type of the development of permeability models.The goal is to find out more precisely the evolution mechanism of the ISCM and its influence on the permeability models.In this paper,the selection of coal structure,determination of boundary conditions and influencing factors of permeability for were first analyzed.Then,according to the research process of ISCM,the permeability models including the ISCM were reviewed and divided into four phases:proposal phase,development phase,evaluation phase and display of internal structure phase.On the basis of the ISCM values in the current coal permeability models,the primary influencing factors and evolutionary laws of the ISCM are explored.The results obtained provide guidance for future theoretical refinement of permeability models with the ISCM.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 51201112, 51274149 and 51474152)the Natural Science Foundation of Shanxi (No. 2013021013-3)the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20121402120004)
文摘The（submicron＋micron） bimodal size Si Cp-reinforced Mg matrix composite was compressed at the temperature of 270–420 °C and strain rate of 0.001–1 s^-1. Then, dynamic recrystallization（DRX） behavior of the composite was investigated by thermodynamic method and verified by microstructure analysis. Results illustrated that the composite possess the lower critical strain and higher DRX ratio as compared to monolithic Mg alloys during hot deformation process. The predicted DRX ratio increased with the proceeding of compression, which was well consistent with the experimental value. Results from thermodynamic calculation suggested that the occurrence of DRX could be promoted by Si Cp, which would be further proved by microstructure analysis. Formation of particle deformation zone around micron Si Cp played a significant role in promoting DRX nucleation. Nevertheless, the distribution of submicron Si Cp was increasingly uniform with the proceeding of compression, which could fully restrain grain growth. Therefore, the corporate effects of micron and submicron Si Cp on DRX contributed to the improvement of DRXed ratio and the refinement of grain size for the composite during compression process.
基金the financial support by the National Natural Science Foundation of China(51371078,51671067)
文摘The room temperature brittleness has been a long standing problem in bulk metallic glasses realm.This has seriously limited the application potential of metallic glasses and their composites.The elastic deformation behaviors of metallic glass matrix composites are closely related to their plastic deformation states.The elastic deformation behaviors of Cu48-xZr48Al4Nbx（x=0,3at.%）metallic glass matrix composites（MGMCs）with different crystallization degrees were investigated using an in-situ digital image correlation（DIC）technique during tensile process.With decreasing crystallization degree,MGMC exhibits obvious elastic deformation ability and an increased tensile fracture strength.The notable tensile elasticity is attributed to the larger shear strain heterogeneity emerging on the surface of the sample.This finding has implications for the development of MGMCs with excellent tensile properties.
基金Financial support is provided by the Research Funds for Key Laboratory of Safe and Effective Coal Mining(Anhui University of Science and Technology)Ministry of Education(JYBSYS2021209)+2 种基金National Science Foundation of China(51804176,51974169 and 51904270)Natural Science Foundation of Shandong Province(ZR2023ME031 and ZR2020QE124)China Postdoctoral Science Foundation(2019M652346 and 2018M 642632).
文摘Coal bed methane(CBM),the high-quality and efficient fuel,has caught the interest of many nations as they strive for environmentally friendly development.Therefore,the efficient exploitation and utilization of CBM has become one of the international focal research problems.A significant factor affecting the mining of CBM is coal permeability.To better capture the changes that occur during the extraction of CBM,the internal swelling coefficient of matrix(ISCM)has been gradually in permeability introduced into the permeability models,and such models have become an important type of the development of permeability models.The goal is to find out more precisely the evolution mechanism of the ISCM and its influence on the permeability models.In this paper,the selection of coal structure,determination of boundary conditions and influencing factors of permeability for were first analyzed.Then,according to the research process of ISCM,the permeability models including the ISCM were reviewed and divided into four phases:proposal phase,development phase,evaluation phase and display of internal structure phase.On the basis of the ISCM values in the current coal permeability models,the primary influencing factors and evolutionary laws of the ISCM are explored.The results obtained provide guidance for future theoretical refinement of permeability models with the ISCM.
