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| 1 | Influence of additive multilayer feature on thermodynamics, stress and microstructure development during laser 3D printing of aluminum-based material显示文摘A transient three dimensional model for describing the temperature behavior,thermo-capillary convection,microstructure evolution and the resultant mechanical properties during selective laser melting of Al N/Al Si10 Mg composite is proposed.The powder-solid transformation,temperature dependent physical properties and the preservation of the heat are taken into account.The effect of the additive manufacturing multilayer feature on the molten pool dynamics,cooling rate,crystal size,microstructure morphology,micro-hardness and types of the residual stress has been investigated.It shows that the operating temperature and the thermo-capillary convection obtained within the molten pool generally increases as the processing multilayers are successively added,while the thermal effect depth is negatively reduced.The preferential direction of the heat diffusion generally changes from a downward pattern,then to the slightly strengthened horizontal direction and finally to a typically horizontal one for various deposited layers being processed.Therefore,the microstructure of the solidified part along the building direction(Region I to Region V) undergoes an interesting transformation:directional columnar cellular microstructure,crosswise-extended cellular microstructure,refined cellular microstructure,fragmentation microstructure and the coarse cellular microstructure.The tensile stress and the compressive stress are comprehensively obtained within the finally solidified layers,significantly influencing the microhardness. | Donghua Dai Dongdong Gu Reinhart Poprawe Mujian Xia | 2017 | Science Bulletin2017，62，11： | 6 |
| 2 | 星光超强激光装置显示文摘超短超强脉冲激光是目前世界上在实验室内产生超高能量密度、超强电磁场和超快时间尺度的综合性极端物理条件的重要手段。在对超短超强脉冲激光发展现状和趋势分析的基础上,针对高能量密度物理等前沿基础科学实验研究多样化的需求,提出研制不同脉冲宽度、三种脉冲激光(两束输出功率为10 PW的飞秒激光、单束输出功率为1 PW@1 Hz的飞秒激光、单束千焦耳皮秒激光和单束万焦耳纳秒激光)协同输出至4个物理实验站形成不同工作模式,实现多种加载-诊断物理实验功能的星光超强激光装置(XG-ELF)的设想。对XG-ELF装置的物理实验设想和主要设计结果进行介绍。建成后的XG-ELF装置将为我国高能量密度物理前沿基础领域中的研究提供先进的研究平台。 | 戴亚平 粟敬钦 魏晓峰 吴玉迟 刘兰琴 李平 王文义 林东晖 郭良福 陈勇 李明中 田小程 曾小明 左言磊 周凯南 严雄伟 贺书凯 董军 | 2022 | 光学学报2022，42，17： | 0 |
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