Novel dynamic compressive and ballistic properties in 7075Al+SiC+B4C hybrid composite
- Title
- Novel dynamic compressive and ballistic properties in 7075Al+SiC+B4C hybrid composite
- Authors
- JO, MIN CHUL; JINHYEOK, CHOI; 조일국; 이상관; LEE, SUNG HAK
- Date Issued
- 2019-06-18
- Publisher
- TechConnect, USA
- Abstract
- When ceramic-reinforced metal-alloy-matrix hybrid composites are fabricated by a liquid-pressing
process, excellent protective capabilities against ballistic impacts can be achieved in armored structures
and materials applications. In this study, a hybrid 7075-T6 Al matrix composite reinforced with SiC
and B 4 C particulates (SiC p or B 4 C p ) was fabricated to increase the volume fraction of reinforcements
and the resultant dynamic and ballistic properties, and was compared with monolithic composites
reinforced with SiC p or B 4 C p . Quasi-static and dynamic compressive properties were evaluated by
operating a universal testing machine and a split Hopkinson pressure bar at strain rates of 10 -3 s -1 and
2800 s -1 , respectively. SiC p s and B 4 C p s were homogeneously distributed in the Al matrix, while
ceramic/matrix interfaces were well bonded without SiC p or B 4 C p agglomerations, pores, or cracks, and
the volume fraction of ceramic reinforcements reached 57 vol.%. In the hybrid composite, fine SiC p
and finer B 4 C p (size; 10 micro m and 5 micro m) worked for the synergic strengthening by increasing the total
reinforcement fraction, and three fracture phenomena such as Al matrix deformation, cracking of
ceramic reinforcements, and ceramic/matrix interfacial debonding were well homogenized, thereby
leading to the excellent strength/ductility combination along with very high strain energy density and
consequently to the great improvement of ballistic performance.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/103460
- Article Type
- Conference
- Citation
- 2019 TechConnect World Innovation, 2019-06-18
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