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| 1 | Microstructure and mechanical properties of repair welds of low-pressure sand-cast Mg?Y?RE?Zr alloy by tungsten inert gas welding显示文摘The sand castings of Mg-Y-RE-Zr series alloys are widely utilized in the large scales and complex shapes in the aerospace industry,as a result of which there are always some cast defects in the products. In this study, the feasibility of repair welding of sand-cast Mg-4 Y-3 RE-0.5 Zr alloy by tungsten inert gas(TIG) welding was scrutinized with different welding currents from 150 to 210 A. The results indicated that defect-free repaired joints with good appearance could be acquired at 170 and 190 A. Interestingly, the grain size of the fusion zone(FZ) was refined initially and then increased with the linear increment of welding current. Because at the higher heat inputs, although the cooling rate of the molten pool was reduced, substantial constitutional supercooling for the grain refinement was attained after the Zr particles were transformed into Zr solutes. The tensile strength of the repaired joint at 170 A was 195 MPa with the maximum joint efficiency of 87.8%, and the elongation reached to 124.4% of the sand-cast base material(BM). However, serious grain coarsening and continuous eutectic structures generated in heat-affected zone(HAZ) above 190 A resulted in the weakening of the joint due to the brittle intergranular fracture. | Xin Tong Guohua Wu Liang Zhang Yingxin Wang Wencai Liu Wenjiang Ding | 2022 | Journal of Magnesium and Alloys2022，10，1： | 2 |
| 2 | 飞秒激光冲击强化技术的研究现状及展望显示文摘作为一种微尺度范围内的表面强化技术,飞秒激光冲击强化具有热影响小、冲击深度浅、能量利用率高、工艺灵活等特点,在实现复杂形状微结构表面改性、宏观尺度零件表面微造型、微冲击成形等方面应用优势显著。概述了飞秒激光冲击强化技术的发展历程,总结了冲击模式、激光参数、附加能场等因素对强化效果的影响规律和机理,并对飞秒激光冲击强化技术的潜在应用及发展趋势进行了展望,以为突破飞秒激光冲击强化的关键问题、推动技术的产业化应用提供必要的指导与支持。 | 王宗申 臧彤 陈磊 孔萌 郑宏宇 | 2023 | 材料保护2023，56，10： | 1 |
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