Lamellar morphology of directional solidified Ti–45Al–6Nb–xW alloys
来源期刊：Rare Metals2016年第1期
论文作者：Zhi-Yuan Hou Yong-Sheng Li Hao-Jie Mei Kai Hu Guang Chen
文章页码：65 - 69
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（Ti3Al） 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 α2（Ti3Al）/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 α2/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 α2/γbecomes smaller,and the lamellar thickness becomes more uniform.
Zhi-Yuan Hou1,2，Yong-Sheng Li1,2，Hao-Jie Mei1,2，Kai Hu1,2，Guang Chen1,2
1. School of Materials Science and Engineering,Nanjing University of Science and Technology2. Engineering Research Center of Materials Behavior and Design,Ministry of Education
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（Ti3Al） 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 α2（Ti3Al）/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 α2/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 α2/γbecomes smaller,and the lamellar thickness becomes more uniform.
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