Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5456780 | Materials Science and Engineering: A | 2017 | 30 Pages |
Abstract
In this study, A356 Al alloy composites reinforced with SiC particulates (SiCp), whose SiCp volume fraction was quite high (about 56Â vol%) for a candidate surface material of multi-layered armors, were fabricated by a liquid pressing process, and their dynamic compressive properties were investigated by using a split Hopkinson pressure bar. Defects such as misinfiltration or pores were eliminated, but about 2Â vol% of eutectic Si particles and about 3Â vol% of Fe-Al intermetallic compound particles were contained in the Al matrix. According to the dynamic compressive test results, dynamic compressive strength and strain were much higher than quasi-static ones because of strain-rate hardening effect and existence of molten Al matrix formed by adiabatic heating. The as-cast composite showed the best combination of dynamic strength and strain, together with the highest dynamic toughness, because the crack propagation was effectively blocked by the molten Al matrix and deformation band formation, while the T6-heat-treated composite showed the lowest compressive strain in spite of the highest strength. These findings suggested that the present Al-SiCp composites could be reliably applied to armors because the dynamic toughness or resistance to fracture was much higher under the dynamic loading than under the quasi-static loading.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Hyungsoo Lee, Seok Su Sohn, Changwoo Jeon, Ilguk Jo, Sang-Kwan Lee, Sunghak Lee,