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采用激光冲击强化技术对LY2铝合金表面进行处理,利用扫描电镜和透射电镜对塑性变形层深度方向的不同区域进行结构表征,测量了元素成分的变化,并对激光冲击强化铝合金的微观机理进行深入的研究。结果表明,激光冲击能够在LY2铝合金表面产生亚微米级的亚晶结构,深度方向的位错结构从随机分布位错到位错线,再到位错缠结,最后到亚晶进行逐步演变,最终形成细化的晶粒。激光冲击的超高应变率对于粗晶的细化和最小平均晶粒尺寸的大小具有至关重要的作用。
The surface of LY2 aluminum alloy was treated by laser shock and the microstructure of LY2 aluminum alloy was characterized by scanning electron microscopy and transmission electron microscopy. The variation of elemental composition was measured. The microscopic mechanism of laser shock strengthened aluminum alloy Deep research. The results show that laser shock can produce sub-micron subgrain on the surface of LY2 aluminum alloy. The dislocation structure in the depth direction changes from random dislocation to dislocation line, then to dislocation entanglement, finally to the subgrain evolution, finally The formation of refined grains. The ultra-high strain rate of laser impact is crucial for the refinement of the coarse grains and the size of the minimum average grain size.