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MICROSTRUCTURE STABILITY IN A FULLY LAMELLAR HIGH Nb-TiAl ALLOY AFTER LONG-TERM THERMAL CYCLING |
FANG Lu 1), DING Xianfei2), ZHANG Laiqi1), HAO Guojian1), LIN Junpin1) |
1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083
2) National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
FANG Lu,DING Xianfei, ZHANG Laiqi, HAO Guojian, LIN Junpin. MICROSTRUCTURE STABILITY IN A FULLY LAMELLAR HIGH Nb-TiAl ALLOY AFTER LONG-TERM THERMAL CYCLING. Acta Metall Sin, 2013, 49(11): 1416-1422.
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Abstract Microstructure stability in the fully lamellar Ti-45Al-8.5Nb(W, B, Y) alloy were investigated by OM, SEM and TEM after long-term thermal cycling (500 and 1000 cyc) at 900 and 1000℃. The results showed that Al-segregation could not be eliminated completely after the heat treatment. After long-term thermal cycling at 900℃, the discontinuous coarsening was inclined to occur in the Al-segregation region in the alloy. And almost no spheroidized precipitates ofα2 were observed even after 1000 thermal cycles. After long-term thermal cycling at 1000℃, the massive γ grains were generated in the Al-segregation region. After 500 thermal cycles, the spherodized α2 precipitates were produced within γ grains which were found at colony boundaries. After 1000 thermal cycles, however, the large equiaxed γ grains containing different orientation of plate-shaped precipitates of theα2 phase were observed within the lamellar structure or at colony boundaries. After long-term thermal cycling at 1000℃, the plate-shaped or particle-shapedα2, which is coherent with the γ matrix, precipitates on the {111}γ plane in the γ grain interior.
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Received: 19 August 2013
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