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- Article name
- Mechanically alloyed dispersion-strengthened composite materials
- Authors
- MURASHEVA V. V., , murasheva_v_v@mail.ru, All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russia
EFIMOCHKIN I. Yu., , iefimochkin@mail.ru, All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russia
BOLSHAKOVA A. N., , alexa20486@mail.ru, All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russia
- Keywords
- composite materials / dispersion strengthening / mechanical alloying / powder metallurgy / creep strain / gas-turbine components
- Year
- 2015 Issue 1 Pages 36 - 40
- Code EDN
- Code DOI
- Abstract
- Metal matrix dispersion-strengthened composite materials (CM) obtained by mechanical alloying are considered. The reinforcing phases of the CMs are thermodynamically stable refractory compounds such as carbides, nitrides, borides, and complex oxides of rare earth elements (REEs) and metals of VIB-VIB groups (eg, Nb, Mo, Zr, etc.). It is noted that a distinctive feature of dispersion-strengthened CMs determining their high temperature strength, is stable subgrain structure formed over the mechanical-thermal treatment of in-processed products during its producing. The high structural stability of the CMs is achieved by fixation of reinforcing 10-50 nm particles in interfaces of grain sub-boundaries. The movement of complexes of particle - grain boundary is performed only when the creep stress is 0,8-0, 9 σ0,2. The dispersion-strengthened CMs having increased high-temperature creep resistance, can operate continuously under load at temperatures equal to 0.9-0.95 Tmelt. The high temperature resistant dispersion-strengthened CMs are used for the manufacturing of structural components of the combustion chambers, gas-turbine engines (GTE) nozzle guide vanes, and etc.
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