Abstract
W-Mo-Ni-Fe-Co heavy tungsten alloys were fabricated by mechanical alloying. The effects of Mo and oxide dipsersoids on the characteristics and properties of the model alloys were investigated. In this study, the W-Mo matrix and γ-Ni(Fe,Co) binder phase were further synthesized with Y2O3 by a secondary ball milling method. The results suggest that the microstructure and sintering behavior of the model alloys are strongly influenced by the dispersed oxide particles. The model alloys with the Y2O3 addition demonstrate grain refinement and uniform microstructure. The dispersed particles could act as an inhibitor for diffusion of tungsten atoms and grain growth, promoting the formation of solid state during sintering. Consequently, good densification, high hardness, and elastic modulus of alloys can be achieved.
Highlights
Tungsten heavy alloys (WHAs) are promising materials for a wide range of applications in medical, military, and aerospace industries, such as radiation shields, kinetic energy penetrators, and counterbalance weights [1,2], due to their superior properties, such as high strength, high density, high radiation absorption, and good wear resistance [2,3,4]
The four W-Mo-Ni-Fe-Co model alloys dispersed with Y2 O3 and possessing variable Mo contents synthesized by mechanical alloying were studied and named W3Mo, W12Mo, W3Mo-YO, and
The results demonstrate that the highest hardness and added Y2O3 show a relatively high hardness of about 430 HV after 24 h milling, which is much elastic modulus values of 10.14 and 427.7 GPa were found in the W3Mo-YO model alloy
Summary
Tungsten heavy alloys (WHAs) are promising materials for a wide range of applications in medical, military, and aerospace industries, such as radiation shields, kinetic energy penetrators, and counterbalance weights [1,2], due to their superior properties, such as high strength, high density, high radiation absorption, and good wear resistance [2,3,4]. Tungsten heavy alloys have attracted attention as potential high temperature structural materials [8,9,10,11,12]. The nano-oxide dispersed particles can be intentionally introduced or formed in-situ by mechanical alloying, which can further enhance high temperature strength and ductility of materials [6]. The. ODS WHAs are normally produced by mechanical alloying, which is a solid-state powder metallurgy processing technique that involves repeated cold welding, fracturing and rewelding of powder particles. Some parameters should be taken into account to prevent material contamination, such as grinding media materials, the process control agent (PCA), and the milling atmosphere [9,10]
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