발간논문

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Vol.38, No.9, 1187 ~ 1195, 2000
Title
Fracture and Dynamic Deformation Behavior of an Oxide - Dispersed Tungsten Heavy Alloy Fabricated by Mechanical Alloying
박상현Sang Hyun Park,김동국Dong Kuk Kim,이성학Sung Hak Lee,홍순형Soon Hyung Hong,류호진Ho Jin Ryu
Abstract
The objective of this study is to investigate the dynamic deformation and fracture behavior of an oxide-dispersed tungsten heavy alloy fabricated by mechanical alloying. The tungsten alloy was processed by adding 0.1 wt.% Y₂O₃ powders during mechanical alloying in order to form fine oxides in tungsten/matrix interface. Dynamic torsional tests were conducted for this alloys, and then the test data were compared with those of a conventionally liquid-phase sintered specimen. The refinement of tungsten particles could be obtained after mechanical alloying and multi-step heat-treatment without an increase in volume fraction of the interfacial area between tungsten particles occurred over broad deformed areas in this alloy , expecting the low possibility of the shear band formation. Also, the oxide dispersion strengthening was effective in promoting the interfacial fracture since fine oxides acted as a initiation site of interfacial fracture. These findings suggested that the idea of forming fine oxides would be useful for improving the self-sharpening effect and the penetration performance of tungsten heavy alloys.
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