A set of uniaxial tensile creep tests at different pre-deformations, aging temperatures and stress levels were carried out for Al-Li-S4 alloy, and the creep behavior and the effects of pre-deformation on mechanical pr...A set of uniaxial tensile creep tests at different pre-deformations, aging temperatures and stress levels were carried out for Al-Li-S4 alloy, and the creep behavior and the effects of pre-deformation on mechanical properties and microstructures were determined under basic thermodynamics conditions of aging forming. The results show that pre-deformation shortens the time of primary creep and raises the second steady-state creep rate. Then, the total creep strain is greater, but in the range of test parameters it is still smaller than that without pre-deformation. In addition, transmission electron microscopy(TEM) observation shows that pre-deformation promotes the formation of T1 phase and θ′ phase and makes them distribute more dispersively, while inhibits the generation of δ′ phase, which leads to the improvement of mechanical properties of the alloy. A unified constitutive model reflecting the effects of aging mechanism, stress levels and different pre-deformations was established. The fitting results agree with the experimental data well.展开更多
以六水合硝酸钴(Co(NO_3)_2·6H_2O)为钴源,硫脲(CS(NH_2)_2)为硫源,采用溶剂热法和低温固相硫化的方法制备出了介孔Co_3S_4纳米棒。采用X射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)等手段对于介孔Co_3S_4纳米棒进行表征,同时对介...以六水合硝酸钴(Co(NO_3)_2·6H_2O)为钴源,硫脲(CS(NH_2)_2)为硫源,采用溶剂热法和低温固相硫化的方法制备出了介孔Co_3S_4纳米棒。采用X射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)等手段对于介孔Co_3S_4纳米棒进行表征,同时对介孔Co_3S_4纳米棒进行了电催化产氧性能测试。结果表明:介孔Co_3S_4纳米棒的起始过电位为0.37 V,塔菲尔斜率为76.95 m V/dec,具有高的电催化产氧性能。展开更多
基金Project(2014CB046602)supported by the National Basic Research Program of ChinaProject(51235010)supported by the National Natural Science Foundation of China
文摘A set of uniaxial tensile creep tests at different pre-deformations, aging temperatures and stress levels were carried out for Al-Li-S4 alloy, and the creep behavior and the effects of pre-deformation on mechanical properties and microstructures were determined under basic thermodynamics conditions of aging forming. The results show that pre-deformation shortens the time of primary creep and raises the second steady-state creep rate. Then, the total creep strain is greater, but in the range of test parameters it is still smaller than that without pre-deformation. In addition, transmission electron microscopy(TEM) observation shows that pre-deformation promotes the formation of T1 phase and θ′ phase and makes them distribute more dispersively, while inhibits the generation of δ′ phase, which leads to the improvement of mechanical properties of the alloy. A unified constitutive model reflecting the effects of aging mechanism, stress levels and different pre-deformations was established. The fitting results agree with the experimental data well.
文摘以六水合硝酸钴(Co(NO_3)_2·6H_2O)为钴源,硫脲(CS(NH_2)_2)为硫源,采用溶剂热法和低温固相硫化的方法制备出了介孔Co_3S_4纳米棒。采用X射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)等手段对于介孔Co_3S_4纳米棒进行表征,同时对介孔Co_3S_4纳米棒进行了电催化产氧性能测试。结果表明:介孔Co_3S_4纳米棒的起始过电位为0.37 V,塔菲尔斜率为76.95 m V/dec,具有高的电催化产氧性能。