Effect of oxide dispersoids addition on mechanical properties of tungsten heavy alloy fabricated by mechanical alloying process

The microstructures and mechanical properties of mechanically alloyed oxide dispersion strengthened tungsten heavy alloys were investigated. Elemental powders of tungsten (W), nickel (Ni), iron (Fe) and partially stabilized zirconia (PSZ) were mechanically alloyed by a planetary mill. Mechanically alloyed powders were consolidated by liquid phase sintering at temperature ranged 1465-1485 degrees C for I h in hydrogen atmosphere to obtain full densification. The W grain size decreases with increasing PSZ content. The oxide dispersoids were dispersed both within W grains and W/W and W/matrix interfaces. The yield strength of oxide dispersion strengthened tungsten heavy alloy was not dependent on PSZ content but dependent on microstructural factor, while the elongation decreases with increasing PSZ content. However, the high temperature yield strength increases with increasing content of PSZ dispersoid and the PSZ dispersoids act as the strengthening agent at high temperature deformation. (c) 2006 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2007-04
Language
ENG
Keywords

DYNAMIC DEFORMATION; MICROSTRUCTURE; PENETRATION; METALS; STRAIN

Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.452, pp.55 - 60

ISSN
0921-5093
DOI
10.1016/j.msea.2006.10.155
URI
http://hdl.handle.net/10203/2419
Appears in Collection
MS-Journal Papers(저널논문)
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