2A10铝合金铆钉电磁铆接微观组织演化研究
Investigation on Microstructure Evolution of 2A10 Aluminum Alloy Rivet in Electromagnetic Riveting
摘要:
本文以2A10铝合金铆钉为材料，研究高速冲击电磁铆接后铆钉镦头微观组织演化，采用金相和透射电镜手段进行分析，结果表明高速冲击作用导致塑性变形主要集中于铆钉镦头的绝热剪切带区域，绝热剪切带宽度约为100 μm。TEM组织表明绝热剪切带内部产生宽度0.5 μm层片状亚晶，并且亚晶内部存在大量缠结的位错。剧烈塑性变形的绝热剪切带显微硬度明显高于其他区域，并且铆钉镦头硬度分布与变形组织分布一致。
Abstract:
In this paper, 2A10 aluminum alloy rivets were used for electromagnetic riveting experiments. The microstructure evolution in rivet tail was investigated after electromagnetic riveting. The mi-crostructure evolutions were analyzed by the optical microscope and transmission electron mi-croscope. Results showed that plastic deformations mainly concentrated in adiabatic shear band of rivet tail due to the high speed impact. The width of adiabatic shear band was about 100 μm. TEM observations demonstrated that lamellar sub-grains with the width of 0.5 μm generated in adiabatic shear band, and many tangled dislocations existed within them. The hardness values in adiabatic shear band with severe plastic deformations were significantly higher than that of other zone, and the hardness distribution law accorded with deformation microstructure distributions.
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