| Title |
Mechanical Behavior / Dynamic Torsional Behavior of Tungsten Heavy Alloys Fabricated by Mechanical Alloying |
| Authors |
김동국(Dong Kuk Kim) ; 이성학(Sung Hak Lee) ; 류호진(Ho Jin Ryu) ; 홍순형(Soon Hyung Hong) ; 노준웅(Joon Woong Noh) |
| Abstract |
Dynamic torsional behavior of tungsten heavy alloys fabricated by mechanical alloying was investigated in order to evaluate the possibility of the adiabatic shear band formation. Dynamic torsional tests were conducted for tungsten alloy specimens fabricated with different sintering temperatures after mechanical alloying, and then the test data were compared with those of a conventionally processed specimen. The refinement of tungsten particles could be obtained after mechanical alloying, although contiguity, i.e., volume fraction of the interfacial area between tungsten particles, was seriously increased, thereby leading to very low ductility and impact energy. The dynamic test results indicated that interfacial fracture between tungsten particles occurred over broad deformed areas in these specimens, expecting the low possibility of the shear band formation. However, application of partial mechanical alloying was effective in the shear band formation since a wide matrix pool acted as a site of localized deformation. These findings suggested that the idea of making matrix pools by partial mechanical alloying would be useful for improving the penetration performance of tungsten heavy alloys. |