ORDERING TRANSFORMATION OF γ TO γ1 IN TiAl+Nb SYSTEM |
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作者姓名: | WANG JINGUO CHEN GUOLIANG YE HENGQIANG |
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摘 要: | A series of TiAl+Nb alloys with various Nb contents has been employed to explore phase relationship and the evolution of microstructure.A new ordered γ derivative (γ1) has been observed in the alloy containing 20 at% Nb.The additional diffraction spots added to the diffraction pattern of L10 (TiAl) structure have been found in the alloy containing Nb up to 11 at% in terms of further ordering.The transformation from L10 (TiAl) structure to the further ordering phase,γ1,is a continuous ordering process with the substitution of Nb atoms for Ti atoms in alloys with over-stoichiometric Al content of TiAl.The possible transformtion characterzation has been discussed.
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关 键 词: | intermetallics Ti-Al-Nb system superstructure ordering transformation |
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