Adiabatic shear band formation in Al-SiCw composites |
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| Authors: | Sunghak Lee Kyung-Mox Cho Ki Chong Kim Won Bong Choi |
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| Affiliation: | (1) Department of Materials Science and Engineering, Pohang Institute of Science and Technology, 790-600 Pohang, Korea;(2) Department of Metallurgical Engineering, Pusan National University, 709-735 Pusan, Korea;(3) Advanced Technical Research Center, Agency for Defense Development, 300-600 Dajeon, Korea |
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| Abstract: | The objective of this study is to investigate the adiabatic shear band formation in 2124-T6 aluminum composites reinforced
with SiC whiskers. The composites were deformed at high strain rates by ballistic impact. Adiabatic shear bands initiated
from cracks near the impacted region were observed. The shear bands tended to propagate along the extrusion direction, since
they were blocked by SiC whiskers. Within the shear bands, microvoids and microcracks formed, presumably by the temperature
rise. Shear bands, together with microvoids and microcracks, deteriorated the impact resistance of target materials. Finally,
performance of the composites against ballistic impact loading was discussed by comparing the behavior of shear banding with
dynamic fracture toughness. |
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