Lamellar morphology of directional solidified Ti᾿5Al᾿Nb᾿em>xW alloys
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- 作者：Zhi-Yuan Hou ; Yong-Sheng Li ; Hao-Jie Mei ; Kai Hu ; Guang Chen
- 关键词：Ti–Al–Nb–W alloy ; Directional solidification ; Lamellar morphology ; Lamellar spacing
- 刊名：Rare Metals
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：35
- 期：1
- 页码：65-69
- 全文大小：1,497 KB
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Yong-Sheng Li (1) (2)
Hao-Jie Mei (1) (2)
Kai Hu (1) (2)
Guang Chen (1) (2)
1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
2. Engineering Research Center of Materials Behavior and Design, Ministry of Education, Nanjing, 210094, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Metallic Materials
Chinese Library of Science - 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
- ISSN：1867-7185
文摘
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° (0.4 at% 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 from 5 to 10 and 20 μm·s−1, the lamellar spacing of α2/γ becomes smaller, and the lamellar thickness becomes more uniform.