大物性差异多材料激光增材制造界面研究进展(特邀)

随着多材料激光增材制造科学与技术的不断进步,一体化制备极端使役性能的大物性差异材料与元件成为可能。但大物性差异多材料增材制造成形界面问题尤为突出。根据大物性差异多材料激光增材制造成形的进展,笔者聚焦大物性差异材料的界面问题和界面优化方法,分别以激光吸收率差异、热物性差异、界面生成脆性相分类阐述界面问题,同时在工艺优化、功能梯度设计、复合制造三个方面对界面优化方法进行总结,为实现大物性差异材料的高质量成形提供参考。同时,阐述了大物性差异多材料激光增材制造建模与仿真研究进展,以期通过宏观和介观尺度模拟指导大物性差异材料的激光增材制造成形参数优化。最后对多材料激光增材制造大物性差异材料的应用和共性科学问题及技术挑战进行了展望与思考。

Microstructure of TA2/TA15 graded structural material by laser additive manufacturing process

TA2/TA15 graded structural material（GSM） was fabricated by the laser additive manufacturing（LAM） process. The chemical composition, microstructure and micro-hardness of the as-deposited GSM were investigated. The results show that the TA2 part of exhibiting near-equiaxed grains was Widmanst？tten α-laths microstructure. The TA15 part containing large columnar grains was fine basket-weave microstructure. The graded zone was divided into four deposited layers with 3000 μm in thickness. As the distance from the TA2 part increases, the alloy element contents and the β phase volume fraction increase, the α phase volume fraction decreases and the microstructure shows the evolution from Widmanst？tten α-laths to basket-weave α-laths gradually. The micro-hardness increases from the TA2 part to the TA15 part due to the solid solution strengthening and grain boundary strengthening.

提高抗激光损伤性能技术研究进展

讨论了国内外提高抗激光损伤性能的技术方法,指出不同方法的优势。主要从微观组织、材料体系、涂层制备方法、损伤阈值、反射率和吸收率等几个角度展开论述。综述了不同材料制备的涂层提高抗激光损伤性能的研究进展,从微观组织、组织颗粒、新研究方法方面展望未来的研究方向:研究颗粒直径对抗激光损伤性能的影响,并将MATLAB、ANSYS等软件应用到提高抗激光损伤性能研究领域。