Y. G .Zhang
,
C. Q. Chen (Beijing University of Aeronautics and Astronautics
,
Beijing 100083
,
China)Q. Xu (Beijing Laboratory of Electron Microscopy
,
Chinese Academy of Sciences. Beijing
,
China)M. C. Chaturvedi (The University of Manitoba
,
Winnipeg
,
Manitoba
,
Canada R3T 2N2)
金属学报(英文版)
A two-phase TiAl-based alloy with fully lamellar structure has been deformed al room temperature and the deformed microstructures have been examined in dtails by optical microscopy(OM), scanning electron microscopy(SEM) and transmission electron microscopy(TEM) . Deformation mechanisms in the γ-TiAl phase has been defined and the role of grain boundaries in the deformation and fracture has been assessed Some of the mechanisms of interactions between twinning or gliding dislocations and three types of γ γ domain boundaries or γ α_2 interface in a lamellar grain have been identified and resistance of the various domain boundaries or the interface to the propagation of twinning has been evaluated
关键词:
:TiAl
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,
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,
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HAN Yafang (Institute of Aeronautical Materials
,
Beijing
,
100095
,
China)CHATURVEDIMC(University of Manitoba Winnipeg
,
Manitoba
,
Canada
,
R3T2N2)
金属学报(英文版)
A high performance Ni-Al-Mo-B system cast Ni_3Al base alloy, named Alloy IC6, has been developed for advanced gas turbine blades and vanes. The alloy has high strength and ductility from room temperature to 1100℃ as well as excellent creep resistance over a wide temperature range of 760℃ to 1100℃ . The superior mechanical properties of this alloy.may be attributed to (1) solid solution hardening by the large amount of Mo addition , (2)second phase strengthening by γ-phase and other minor phases that precipitate in various temperature ranges, (3) rearrangement of γ-phase in the form of raft structure during creep deformation , (4) high-density misfit dislocation networks at the γ /γ' interfaces that form due to a high value ofγ /γ ' misfit .
关键词:
: Ni_3Al Alloy
,
null
,
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