Effect of thermal stabilization on microstructure and mechanical property of directionally solidified Ti-46Al-0.5W-0.5Si alloy

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• 作者：Jiang-lei FAN ; ^{JLFan2011@163.com} ; Xin-zhong LI ; ^{hitlxz@126.com} ; Yan-qing SU ; Rui-run CHEN ; Jing-jie GUO ; Heng-zhi FU
• 关键词：intermetallics ; TiAl-based alloy ; crystal growth ; microstructure evolution ; mechanical properties
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：22
• 期：5
• 页码：1073-1080
• 全文大小：1827 K

文摘

Effect of thermal stabilization on the microstructure and mechanical property of directionally solidified Ti-46Al-0.5W-0.5Si (mole fraction, % ) alloy was investigated. The specimens were thermal stabilized for different time (t) and directionally solidified at a constant growth rate of 30 ¦Ìm/s and temperature gradient of 20 K/mm. Dependencies of the primary dendritic spacing (¦Ë₁), secondary dendritic spacing (¦Ë₂), interlamellar spacing (¦Ë_L) and microhardness (HV) on holding time were determined. The values of the ¦Ë₁, ¦Ë₂ and ¦Ë_L increase with the increase of t, and the value of HV decreases with the increase of t. The increase of t is helpful to obtain a good directional solidification structure. However, it reduces the mechanical property of the directionally solidified TiAl alloy. The optimized value of t is about 30 min.