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分析了激光冲击加载下2A12铝合金组织和力学性能的变化规律,得出以下结论:激光冲击会使2A12铝合金位错密度大幅增加,晶界和晶内出现位错塞积、位错胞状组织等;随变形量的增加,结构中出现大量孪晶,二者互相作用,晶粒破碎细化。这些组织都会不同程度增加2A12铝合金的硬度和强度,从而有效地改善2A12铝合金的力学性能。激光冲击后,冲击区中心点硬度由94 HV升高到145 HV,升高了大约54%。
The variation regularity of the microstructure and mechanical properties of 2A12 aluminum alloy under laser shock loading was analyzed. The following conclusions were drawn: laser shock can significantly increase the dislocation density of 2A12 aluminum alloy, dislocation accumulation in grain boundary and grain, dislocation cell Etc .; with the increase of deformation, a large number of twins appear in the structure, the two interact with each other and the grains are broken and refined. These organizations will increase the hardness and strength of 2A12 aluminum alloy to varying degrees, so as to effectively improve the mechanical properties of 2A12 aluminum alloy. After laser shock, the hardness of the center of the impact zone increased from 94 HV to 145 HV, an increase of about 54%.