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Lamellar morphology of directional solidified Ti–45Al–6Nb–xW alloys 被引量:4

Lamellar morphology of directional solidified Ti–45Al–6Nb–xW alloys
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摘要 Directional solidification of Ti-45Al-6Nb-xW(x=0,0.4,0.8;at%) alloys was performed by Bridgeman method with the stable growth rate of 5,10,and 20 μm·s^(-1).The differential scanning calorimeter(DSC) results indicate that both the eutectic temperature and the transition temperature of α(Ti_3Al) to γ(TiAl) increase with W content increasing from 0 at%to 0.8 at%.For the stable growth rate of 10 μm·s^(-1),the orientations of α_2(Ti_3Al)/γ(TiAl)lamellae change from 45°(0 at%W) to 0° and near 0°(0.4at%and 0.8 at%W) to the crystal growth direction,and the spacing of α_2/γ lamellae decreases with W content increasing from 0 at%to 0.4 at%,while it increases when W content is 0.8 at%.With the increase in growth rate from5 to 10 and 20 μm·s^(-1),the lamellar spacing of α_2/γbecomes smaller,and the lamellar thickness becomes more uniform. Directional solidification of Ti-45Al-6Nb-xW(x=0,0.4,0.8;at%) alloys was performed by Bridgeman method with the stable growth rate of 5,10,and 20 μm·s^(-1).The differential scanning calorimeter(DSC) results indicate that both the eutectic temperature and the transition temperature of α(Ti_3Al) to γ(TiAl) increase with W content increasing from 0 at%to 0.8 at%.For the stable growth rate of 10 μm·s^(-1),the orientations of α_2(Ti_3Al)/γ(TiAl)lamellae change from 45°(0 at%W) to 0° and near 0°(0.4at%and 0.8 at%W) to the crystal growth direction,and the spacing of α_2/γ lamellae decreases with W content increasing from 0 at%to 0.4 at%,while it increases when W content is 0.8 at%.With the increase in growth rate from5 to 10 and 20 μm·s^(-1),the lamellar spacing of α_2/γbecomes smaller,and the lamellar thickness becomes more uniform.
出处 《Rare Metals》 SCIE EI CAS CSCD 2016年第1期65-69,共5页 稀有金属(英文版)
基金 financially supported by the National Basic Research Program of China(No.2011CB605504) the National Natural Science Foundation of China(No.51571122) the Fundamental Research Funds for the Central Universities(No.30920130121012)
关键词 Ti-Al-Nb--W alloy Directionalsolidification Lamellar morphology Lamellar spacing Ti-Al-Nb--W alloy Directionalsolidification Lamellar morphology Lamellar spacing
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