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Vol.37, No.1, 33 ~ 42, 1999
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| Title |
| Mechanical Behavior / Dynamic Torsional Behavior of Tungsten Heavy Alloys Fabricated by Mechanical Alloying |
| 김동국 , 이성학 , 류호진 , 홍순형 , 노준웅 Dong Kuk Kim , Sung Hak Lee , Ho Jin Ryu , Soon Hyung Hong , Joon Woong Noh |
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| 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. |
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