High strain rate superplastic bulge forming of SiC particle reinforced 2124 aluminum alloy composite.

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  • ＳｉＣ粒子強化２１２４アルミニウム合金複合材料の高速超塑性バルジ成形
  • SiC リュウシ キョウカ 2124 アルミニウム ゴウキン フクゴウ ザイリョウ ノ コウソク チョウソセイ バルジ セイケイ

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Abstract

High strain rate superplastic bulge forming of aluminum alloy matrix composite sheets reinforced by SiC particles was studied and compared to their deformation characteristics in a tensile test. Bulge forming test was performed at elevated temperatures using 36 mm diameter blank disks by gas pressure. The bulge shapes were successfully formed at high strain rate (about 0.1/s) at which superplasticity is observed in the tensile test. The superplastic formability of the composite with 25% volume fraction of SiC particles is better than that with 17% SiC, corresponding to the measured elongation in the tensile test. The limit bulge height of the sheet with the same SiC volume fraction is increased with increasing initial thickness. The higher forming gas pressure, namely the higher forming rate, lead to the uniform thickness distributions of the bulged part. The maximum thickness strain at the top of the bulge and the applied stress calculated from the forming gas pressure in bulge forming can be concerned with the elongation and the flow stress in the tensile test.

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