Production of Self-Composite Microstructure by Laser Tailoring

本工作首次利用本课题组自行设计开发的光纤激光光斑加热系统，成功地在A2024-T3铝合金板材中制备出了“自复合组织”。光斑加热系统的最大功率为100W，能够将直径为3微米的激光聚焦到样品表面。它还具有用任何编程图案扫描光束以进行点加热的功能。“条纹状”A2024-T3铝合金板材的弯曲强度表现出明显的各向异性，这是因为在整体板材中产生的软硬区交替变化，就像是一种复合材料。

The present work firstly succeeded to produce" self-composite microstructure" in an A2024-T3 aluminum alloy sheet utilizing a fiber-laser spot heating system which has been newly designed and developed in my group. The spot heating system generates 100W in maximum power and enables to focus the laser beam into 3um in diameter on the surface of specimen. It also has a function to scan the beam for spot heating with any programmed pattern. A" stripe-like" laser-patterned A2024-T3 aluminum alloy sheet clearly shows anisotropy in bending strength because of the alternative change of soft and hard region produced in the monolithic sheet, which is like a composite material.