| Title |
Microscopic Observation of Adiabatic Shear Band in Al - SiCw Composites |
| Authors |
이성학(Sung Hak Lee); 김기종(Ki Jong Kim); 조경목(Kyung Mok Cho); 최원봉(Won Bong Choi); 김한식(Han Sik Kim) |
| Abstract |
The objective of the present study is to investigate the adiabatic shear band of 2124-T6 Al-SiCw composites. The composites were highly deformed at high strain rate by ballistic impact and the adiabatic shear bands revealed white-etching bands with evidence of highly deformed flow on the edges of the cracks near the impacted region. Reaction products, microvoids and whisker rearrangement were observed within the shear band presumably due to the local temperature rise occurring during dynamic deformation. The bands had trends to change their propagation path along the extrusion direction because SiC whiskers effectively prevented the formation of adiabatic shear band by increasing the strength level and by blocking the propagation of the shear band. Ballistic performance of the Al-SiCw composites was also analyzed by comparing the shear band behavior with dynamic fracture toughness. |